EPS-HEP 2017
Venice, Italy
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Registration and Welcome drink 3h Entrance Hall (Palazzo del Casinò)
Entrance Hall
Palazzo del Casinò
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Astroparticle physics Room Martinelli (Palazzo del Casinò)
Room Martinelli
Palazzo del Casinò
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09:00
Latest results of the LHCf experiment at LHC 18m
In 2016 the LHCf experiment has fulfilled its original goal of measuring the spectra of the neutral particles produced in the very forward direction at LHC at the highest energy ever available. The main purpose of these measurements is indeed to provide the Cosmic Ray and High Energy Physics communities with a missing unique set of information for the improvement of the hadronic interaction models used to simulate air showers development produced in the interaction of primary High Energy Cosmic Rays (HECR) with the Earth atmosphere. The last data sets collected by the LHCf experiment have been obtained during p+p collisions, at an energy of 13 TeV in the CM frame, and p+Pb collision, at an energy of the colliding nucleon pair of 5.2 TeV and 8.1 TeV in the CM frame. A review of the main results of LHCf and of the recent and on-going activities will be presented.
Speaker: Alessia Tricomi (Universita e INFN, Catania (IT)) -
09:18
LHCb inputs to astroparticle physics 18m
The LHCb experiment has the unique possibility, among the LHC experiments, to be operated in fixed target mode, using its internal gas target SMOG. The excellent detector capabilities for vertexing, tracking and particle identification allow to measure exclusive particle production for collisions of protons on different nuclei at an energy scale of sqrt(sNN) ~ 100 GeV, providing valuable inputs to the modelling of cosmic ray interactions in the atmosphere and in the cosmos.
In particular, by operating SMOG with helium, LHCb performed the first measurement of antiproton production in proton-helium collisions.
The results improve the accuracy of the prediction for secondary antiproton production in cosmic rays at the energy scale accessible to space-borne detectors.Speaker: Marianna Fontana (Universita e INFN, Cagliari (IT)) -
09:36
On the Matter Content of Astrophysical Jets 18m
High-energy space missions allow keeping watch over blazars, which are jet emitting astrophysical sources that can flare. They provide deep insights into the engine powered by supermassive black holes. However, having a blazar caught in a very bright flaring state is not easy requiring long surveys. The observation of such flaring events represents a goldmine for theoretical studies.
Such a flaring event was captured by the INTEGRAL mission in June 2015 while performing its today’s deepest extragalactic survey when it caught the prominent blazar 3C 279 in its brightest flare ever recorded at gamma-ray energies. The flare was simultaneously recorded by the Fermi-LAT mission, by the Swift mission, by the INTEGRAL mission and by observations ranging from UV, through optical to the near-IR bands. The derived snapshot of this broad spectral energy distribution of the flare has been modeled in the context of a one-zone radiation transfer leptonic and lepto-hadronic models constraining the matter content. I will discuss results and challenges faced by trying to reconcile these observations and theory. I will also show very recent results from TeV observations by Atmospheric Cherenkov Telescopes of the flare of 3C 279 and how they relate to our predictions.
Speakers: Eugenio Bottacini (University of Padova), Eugenio Bottacini -
09:54
The PROSA PDF fit and prompt neutrino fluxes 18m
Prompt neutrino fluxes are background for searches of astrophysical neutrinos at Very Large Volume Neutrino Telescopes. We present predictions for these fluxes, obtained by state-of-the-art QCD methods, and we discuss their uncertainties, in particular those related to our approximate knowledge of Parton Distribution Functions. We make use of the PROSA fit, the first fit appeared in literature including LHCb data on heavy-meson hadroproduction, specifically designed for low-x physics.
We present the present status of the fit and prospects for future developments.
We compare our predictions with experimental data from the IceCube collaboration.Speakers: Dr Maria Vittoria Garzelli, Achim Geiser (DESY), Oleksandr Zenaiev, S. Moch (UHH) -
10:12
Understanding cosmic ray small-scale anisotropies 30m
The arrival directions of Galactic cosmic rays are highly isotropic. This is expected from the presence of turbulent magnetic fields in our Galactic environment that repeatedly scatter charged cosmic rays during propagation. However, various cosmic ray observatories have identified weak anisotropies of various angular sizes and with relative intensities of up to a level of 1 part in 1,000. Whereas large-scale anisotropies are generally predicted by standard diffusion models, the appearance of small-scale anisotropies down to an angular size of $10^\circ$ is surprising. In this review, I summarise the current experimental situation and address some of the remaining questions in interpreting the observed large-scale anisotropies. I review some of the various suggestions for explaining the small-scale anisotropies, focussing on the promising idea that they are a direct reflection of the particular realisation of the turbulent magnetic field in our Galactic neighbourhood.
Speaker: Philipp Mertsch -
10:42
The DAMPE experiment: a probe for high energy cosmic-ray. 18m
The DAMPE (DArk Matter Particle Explorer) satellite was launched on
December 17, 2015 and it is taking data from more than 18 months.
It is designed to probe the highest energy cosmic-ray accelerators and to study
the nature of dark matter thanks to its excellent tracking and
calorimetric performances in the measurements of electrons, gamma rays, protons and nuclei.
A report on the mission goals and status will be given.
The on-orbit detector performance will be also shown.Speaker: Dr Gargano Fabio (INFN-Bari) -
11:00
Coffee break 30m
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11:30
Time dependence of the helium flux measured by PAMELA 18m
The last solar cycle has presented a peculiarly long quiet phase with consequent minimum modulation conditions for cosmic rays. The proton and electron spectra were measured from July 2006 to December 2009 by PAMELA experiment, providing fundamental information about the transport and modulation of cosmic rays inside the heliosphere. These studies allow to obtain a more complete description of the cosmic radiation. In this picture the time dependence of the helium spectrum become very important to constrain parameters of the actual solar modulation model.
In this talk the helium spectrum measured from July 2006 to June 2014 by PAMELA experiment over six-month time intervals is presented.Speaker: Beatrice Panico (INFN - National Institute for Nuclear Physics) -
11:48
Characteristic Energy Dependence of Primary and Secondary Cosmic Rays measured with the AMS Detector on the Space Station 18m
Precision study of cosmic nuclei provides detail knowledge on the origin and propagation of cosmic rays. In the past, results of different experiments often had large uncertainty and are different of each other. AMS was designed to measure and identify cosmic ray nuclei with seven independent detectors, thus it is able to provide precision studies of nuclei simultaneously to multi-TeV energies. In 6 years on the Space Station, AMS has collected 100 billion both primary and secondary cosmic rays. Primary cosmic rays, such as p, He, C and O, are believed to be mainly produced and accelerated in supernova remnants, while secondary cosmic rays, such as Li, Be and B are thought to be produced by collisions of heavier nuclei with interstellar matter. The unique and distinct rigidity dependence of primary and secondary cosmic ray fluxes with charges Z=1 to Z=8 in the GV to TV rigidity range will be presented. The characteristics of the disagreement of the AMS results with the predictions of the GALPROP model will also be presented for each nuclei.
Speakers: Valerio Formato, Valerio Formato, Valerio Formato (Universita e INFN, Perugia (IT)) -
12:06
Precision Measurement of 3He-to-4He ratio in Cosmic Rays with the AMS Detector on the Space Station 18m
The knowledge of the energy dependence of the $^{3}$He-to-$^{4}$He flux ratio ($^{3}$He/$^{4}$He) is one of the most important sources for studying and testing cosmic ray propagation models.
Similar to the B/C measurement, where B is assumed to originate from interactions of primary Carbon and Oxygen in Cosmic Rays, in the $^{3}$He/$^{4}$He measurement $^{3}$He is assumed to be produced by interactions of $^{4}$He and heavier nuclei with the interstellar matter.
The $^{3}$He/$^{4}$He ratio is a powerful tool for determining the amount of interstellar material traversed by cosmic rays and, and since $^{4}$He has smaller cross section compared to C and O, this provides testing of the propagation models over larger travelled distances.
The AMS results are unique and distinct from all the previous data and they are presented here for the first time. The AMS $^{3}$He/$^{4}$He flux ratio is based on 9 million $^{3}$He events and 56 million $^{4}$He events and it extends from 0.7 GeV/n to 10 GeV/n in a region where previous measurements have large errors and are not consistent with each other. This prevents accurate comparison with models. We will present comparison of our results with theoretical models.
Speaker: Prof. Paolo Zuccon (Massachusetts Inst. of Technology (US)) -
12:24
Latest results of the Pierre Auger Observatory 18m
The Pierre Auger Observatory, located in Argentina, has been detecting ultra-high energy cosmic rays for more than ten years. The combination of a large surface detector array and fluorescence telescopes provides a substantial improvement in energy calibration and extensive air shower measurements, resulting in data of unprecedented quality in the energy range from 0.1 EeV up to 100 EeV. A review of main results from the Pierre Auger Observatory is presented with a particular focus on the energy spectrum measurements , mass composition studies and the arrival directions analyses.
Speaker: Mrs Isabelle Lhenry-Yvon (IPN Orsay, CNRS IN2P3) -
12:42
The ANITA and HiCal experiments in Antarctica. 13m
The balloon-borne ANITA experiment is designed to detect the radio-frequency Cherenkov radiation resulting from collisions of either ultra-high energy (UHE) neutrinos colliding with ice molecules, or cosmic rays interacting with air molecules in the atmosphere. Thus far, four flights over the last decade have yielded world's-best sensitivity in the E>1 EeV regime. The HiCal experiment, consisting of a transmitter hung off a smaller balloon, was designed to provide an in-air calibration of ANITA, and has also allowed calibration of the Antarctic ice- surface. We discuss recent science results from ANITA and HiCal, which produced pinger signals observed at distances of almost 1000 km from ANITA, as well as complementary studies of radio frequency ice properties, which have been derived from studies of data from similar neutrino-detection experiments (RICE, ARA, and ARIANNA) within the last several months, and how these most recent results impact estimates of cosmic ray (both charged and neutral) sensitivity.
Speaker: Steven Prohira (University of Kansas)
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Detectors and data handling Room Amici (Palazzo del Casinò)
Room Amici
Palazzo del Casinò
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The CMS trigger in Run 2 15m
During its second run of operation (Run 2) which started in 2015, the LHC will deliver a peak instantaneous luminosity that may reach $2 \cdot 10^{34} cm^{-2}s^{-1}$ with an average pile-up of about 55, far larger than the design value. Under these conditions, the online event selection is a very challenging task. In CMS, it is realized by a two-level trigger system: the Level-1 (L1) Trigger, implemented in custom-designed electronics, and the High Level Trigger (HLT), a streamlined version of the offline reconstruction software running on a computer farm.
In order to face this challenge, the L1 trigger has been through a major upgrade compared to Run 1, whereby all electronic boards of the system have been replaced, allowing more sophisticated algorithms to be run online. Its last stage, the global trigger, is now able to perform complex selections and to compute high-level quantities, like invariant masses. Likewise, the algorithms that run in the HLT go through big improvements; in particular, new approaches for the online track reconstruction lead to a drastic reduction of the computing time, and to much improved performances. This presentation will describe the performance of the upgraded trigger system in Run 2.Speaker: Mia Tosi (CERN) -
09:15
Construction and commissioning of the Phase I upgrade of the CMS pixel detector 15m
The Phase I upgrade of the CMS pixel detector, installed by the CMS collaboration during the recent extended end-of-year technical stop, is built out of four barrel layers (BPIX) and three forward disks in each endcap (FPIX). It comprises a total of 124M pixel channels, in 1,856 modules and it is designed to withstand instantaneous luminosities of up to 2 x 10^34 cm-2 s-1 with increased detector acceptance and additional redundancy for the tracking, while at the same time reducing the material budget.
These goals are achieved using a new readout chip and modified powering and readout schemes, one additional tracking layer both in the barrel and in the disks, and new detector supports including a CO2 based evaporative cooling system.
Different parts of the detector have been assembled over the last year and later brought to CERN for installation inside the CMS tracker. At various stages during the assembly tests have been performed to ensure that the readout and power electronics, and the cooling system meet the design specifications. After tests of the individual components, system tests have been performed before the installation inside CMS.
This contribution will review the design and technological choices of the Phase I detector, with a focus on the challenges and difficulties encountered, and present results from system tests and from the final commissioning of the detector in-situ using the central CMS DAQ system.Speaker: Rachel Bartek (Catholic Unversity of America) -
09:30
Performance and track-based alignment of the upgraded CMS pixel detector 15m
The Compact Muon Solenoid (CMS) is a multi-purpose detector constructed in order to study high-energy particle collisions in the Large Hadron Collider (LHC) at CERN. The all-silicon design of the tracking system of the CMS experiment provided excellent resolution for charged tracks and an efficient tagging of jets during Run1 and Run2 of LHC.
As CMS upgraded and installed the pixel detector during the shutdown in the beginning of 2017, the position and orientation of tracker needed to be determined with a precision of several micrometers. The alignment also needs to be quickly recalculated each time the state of the CMS magnet is changed between 0T and 3.8T.
We present latest results of the CMS tracker performance in the 2017 run, with a special focus on alignment and resolution performance using several million reconstructed tracks from collisions and cosmic rays data.Speaker: Valeria Botta (Deutsches Elektronen-Synchrotron (DE)) -
09:45
Operational Experience and Performance with the ATLAS Pixel detector with emphasis on radiation damage 15m
The tracking performance of the ATLAS detector relies critically on its 4-layer Pixel Detector, that has undergone significant hardware and software upgrades to meet the challenges imposed by the higher collision energy, pileup and luminosity that are being delivered by the Large Hadron Collider, with record breaking instantaneous luminosities of 1.3 x 10^34 cm-2 s-1 recently surpassed.
The key status and performance metrics of the ATLAS Pixel Detector are summarised, and the operational experience and requirements to ensure optimum data quality and data taking efficiency are described, with special emphasis to radiation damage experience.Speaker: Pierfrancesco Butti (CERN) -
10:00
The ATLAS Trigger in Run-2 - Design, Menu and Performance 15m
The ATLAS trigger has been used very successfully for online event selection during the first part of the second LHC run (Run-2) in 2015/16 at a centre-of-mass energy of 13 TeV. The trigger system is composed of a hardware Level-1 trigger and a software-based high-level trigger. Events are selected based on physics signatures such as presence of energetic leptons, photons, jets or large missing energy. The trigger system exploits topological information, as well as multi-variate methods to carry out the necessary physics filtering. In total, the ATLAS online selection consists of thousands of different individual triggers. Taken together constitute the trigger menu, which reflects the physics goals of the collaboration while taking into account available data taking resources.
The trigger selection capabilities of ATLAS during Run-2 have been significantly improved compared to Run-1, in order to cope with the higher event rates and number of interactions per bunch crossing (pileup) which are the result of the almost doubling of the center-of-mass collision energy and the increase in the instantaneous luminosity of the LHC. At Level-1 the undertaken improvements resulted in more pileup-robust selection efficiencies and event rates and in a reduction of fake candidate particles, including the novel use of topological information. The re-design of the high-level trigger allows deployment of more sophisticated reconstruction techniques online, resulting in trigger selection performance nearly matching that of offline reconstruction.
This presentation gives a comprehensive review the ATLAS trigger system and menu in Run 2, covering validation and perational aspects, trigger bandwidth constraints, and the latest performance evaluations. Using a few examples the presentation shows the impressive improvements that were made in preparation for the expected highest ever luminosities and pileup in the 2017/18 LHC run.
Speaker: Tamara Vazquez Schroeder (McGill University (CA)) -
10:15
Performance and recent developments of the real-time track reconstruction and alignment of the LHCb detector. 15m
The LHCb detector is a single-arm forward spectrometer, which has been designed for the efficient reconstruction decays of c- and b-hadrons. During the 2013-2015 long shut-down LHCb has introduced a novel real-time detector alignment and calibration strategy for LHC Run II. Data collected at the start of the fill are processed in a few minutes and used to update the alignment, while the calibration constants are evaluated for each run. This procedure permits to obtain the same quality of the processed events in the trigger system as in the offline reconstruction. In addition, the larger timing budget available allows to process the events using the best performing reconstruction in the trigger, which fully includes the particle identification selection criteria. This approach greatly increases the efficiency, in particular for the selection of charm and strange hadron decays. In this talk the basics of the approach are discussed, followed by presentation of the recent developments implemented for the 2017 run of data taking. The topic is discussed in terms of operational performance and reconstruction quality.
Speaker: Agnieszka Dziurda (CERN) -
10:30
KLOE-2 Inner Tracker: the First Cylindrical GEM Detector 15m
KLOE-2 at the e$^+$e$^-$ DA$\Phi$NE collider, is the main experiment of the INFN Laboratori Nazionali di Frascati (LNF) and is the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea developed at LNF exploiting the kapton properties. The experiment is the continuation of KLOE, upgraded with state-of-the-art technology to improve its discovery potential, with a new physics program mainly focused on the study of Ks, $\eta$ and $\eta^{'}$ decays as well as on kaon interferometry, test of discrete symmetries, and search for physics beyond the Standard Model. Four concentric cylindrical triple-GEM detectors compose the Inner Tracker which has been inserted around the interaction region and before the inner wall of the pre-existing KLOE Drift Chamber, at distances from 130 mm to 205 mm, to improve the resolution on decay vertices close to the interaction point (IP) reconstructed from low-momentum charged secondaries. State-of-the-art solutions have been expressly developed or tuned for this project: single-mask GEM etching, multi-layer XV patterned readout circuit, PEEK spacer grid, GASTONE front-end board, a custom 64-channel ASIC with digital output, and the Global Interface Board for data collection, with a configurable FPGA architecture and Gigabit Ethernet. Alignment and calibration of a cylindrical GEM detector was never done before and represents one of the challenging activities of the experiment. The first set of alignment and calibration parameters obtained with cosmic-ray muons has been used with Bhabha scattering events to validate the integrated tracking using both Inner Tracker and Drift Chamber information, exploiting the Kalman filter technique. Data taking campaign started in November 2014, reached 3.5 fb$^{-1}$ integrated luminosity and is presently ongoing with the aim of collecting more than 5 fb$^{-1}$ by March 2018.
The Inner Tracker detector operation, calibration and performance will be presented.Speaker: Erika De Lucia (INFN e Laboratori Nazionali di Frascati (IT)) -
10:45
The SoLid short baseline neutrino detector 15m
The SoLid short baseline reactor neutrino experiment consists of a highly segmented plastic scintillator detector with a fiducial mass of 2 ton. Its main purpose is to prove or rule out the existence of sterile neutrinos corresponding to $\delta_{M^2}$ values of order 1eV$^2$. The covered baseline ranges between 6 and 9 meters and is in-line with the compact core of the 60MW BR2 reactor of the Belgian Nuclear Research Centre. The experiment will come online in the summer of 2017 and will reconstruct over 50.000 neutrino events per year, based on the inverse beta decay process.
In this talk we will review the detector technology and several improvements made to the original design, based on the physics and operational performance of a 320kg full size prototype module that took data at the same site in 2015.
When available, we will also present a preview of the commissioning data of the final design detector system, that should come online around the time of this conference.Speaker: Mr Valentin Pestel (LPC Caen) -
11:00
Coffee break 30m
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The NA62 Calorimeter Level 0 Trigger Operation and Performances 15m
The NA62 experiment at CERN SPS aims to measure the Branching Ratio of the very rare kaon decay K+ -> pi+ nu nubar collecting ~100 events with a 10% background to make a stringent test of the Standard Model in two years of data taking.
The Calorimeter Level 0 Trigger is used to suppress one of the main backgrounds, the K+ -> pi+ pi0 decay, and to select events with a pi+ in the final state.
The Calorimeter Level 0 Trigger identifies clusters in electromagnetic and hadronic calorimeters. It prepares time-ordered lists of reconstructed clusters together with the arrival time, position, and energy measurements of each cluster. It also provides trigger decisions based on complex energy and cluster multiplicity combinations.
The main parameters of the trigger processor are the high design hit rate (30 MHz) and the required single cluster time resolution (1.5 ns).
The calorimeter trigger processor is a parallel system composed of 37 boards, 111 mezzanines and 221 high-performance programmable devices housed in three 9U crates.
The Calorimeter Level 0 Trigger also provides a coarse-grained readout of the calorimeters that might be used in software trigger levels.
The NA62 experiment is currently taking data and the calorimetric trigger is used to suppress the background coming from the K+ -> pi+ pi0 decay and to trigger on many other medium-rare and exotic decays.
The design, operation and performances of the Calorimeter Level 0 Trigger are presented.
Speaker: Andrea Salamon (INFN e Universita Roma Tor Vergata (IT)) -
11:45
The CERN Neutrino Platform 15m
The long-baseline neutrino programme has been classified as one of the four highest-priority scientific objectives in 2013 by the European Strategy for Particle Physics. The Neutrino Platform is the CERN venture to foster and support the next generation of accelerator-based neutrino oscillation experiments.
Part of the present CERN Medium-Term Plan, the Neutrino Platform provide facilities to develop and prototype the next generation of neutrino detectors and contribute to unify the European neutrino community towards the US and Japanese projects.
A significative effort is made on R&D for LAr TPC technologies: two big LAr TPC prototypes for the DUNE far detector are under construction at CERN. Those detectors will be exposed in 2018 to an entirely new and NP-dedicated beam-line from the SPS which will provide electron, muon and hadron beams with energies in the range of sub-GeV to a few GeV.
Other projects are also presently under development: one can cite the refurbishing and shipping to the US of the ICARUS detector and the construction BabyMIND a magnetised muon spectrometer to be located on the T2K beam line.In this talk the status of the CERN Neutrino Platform activities will be presented as well as an overview of the future projects currently under discussion.
Speaker: Stefania Bordoni (CERN) -
12:00
Technological Prototypes and Result Highlights of Highly Granular Calorimeters 15m
Following successful demonstrations of the potential of highly granular calorimeters by the CALICE collaboration, the emphasis of current R&D has shifted to the next generation of prototypes. Optimized for Particle Flow Algorithms (PFA) which will achieve unprecedented jet energy resolution at future colliders, this new generation of CALICE calorimeters also addresses full system requirements such as compactness and low power consumption. These activities cover further developments of the technological prototype of the RPC-based SDHCAL already tested in beams, the construction of a full technological prototype of the SiPM / scintillator - based Analog HCAL following recent tests of smaller systems, and a second-generation SiW ECAL. Within these projects, large detector areas, automatic assembly and testing procedures and self-supporting mechanical structures are being developed. The detectors use a new generation of low noise, power-pulsed electronics with independent channels and zero suppression protocol as well as precise cell-by-cell time stamping. The prototypes will be instrumented with a common DAQ system to enable combined beam tests of several prototypes and have already successfully been operated with a newly developed monitoring and control system. This presentation will discuss the latest technological developments of these new calorimeter prototypes, and highlight areas of fruitful synergies with planned and ongoing upgrades of LHC experiments.
Speakers: Gerald Grenier (Institut de Physique Nucleaire de Lyon (IPNL)), Gerald Grenier (Universite Claude Bernard-Lyon I (FR)) -
12:15
Performance of the Pixel Luminosity Telescope for Luminosity Measurement at CMS during Run2 15m
The Pixel Luminosity Telescope (PLT) is a dedicated system for luminosity measurement at the CMS experiment using silicon pixel sensors arranged into "telescopes", each consisting of three planes. It was installed during LS1 at the beginning of 2015 and has been providing online and offline luminosity measurements throughout Run 2. The online bunch-by-bunch luminosity measurement employs the "fast-or" capability of the pixel readout chip (PSI46) to identify events where a hit is registered in all three sensors in a telescope corresponding primarily to tracks originating from the interaction point. In addition, the full pixel information is read out at a lower rate, allowing for the calculation of corrections to the online luminosity from effects such as the miscounting of tracks not originating from the interaction point and detector efficiency. In this talk, we will present results from 2016 running and preliminary 2017 results, including commissioning and operational history, luminosity calibration using Van der Meer scans, and corrections to the online luminosity, as well as offline performance and monitoring.
Speaker: Paul Lujan (Universita e INFN, Padova (IT)) -
12:30
ATLAS Forward Proton detectors: first experience with data 15m
The aim of the ATLAS Forward Proton (AFP) detector system is the measurement of protons scattered diffractively or
electromagnetically at very small angles. The first arm of the system was installed last year and AFP took data in several commissioning and physics runs. The installation of the second arm is ongoing and will be completed in time for the 2017 data taking period. This will allow measurements of processes with two forward protons: central diffraction, exclusive production, and two-photon processes. During the presentation, the early results and experience from the first year of data taking will be presented together with the status of the second-arm installation, first experience with this year data taking using two-arm set-up, and plans for the future.Speaker: James Pinfold (University of Alberta (CA))
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Dark matter Room Mosaici-1 (Palazzo del Casinò)
Room Mosaici-1
Palazzo del Casinò
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WIMP Direct Detection Experiments 30m
Weakly Interacting Massive Particles (WIMPs) are one of the best motivated elementary particle candidates for dark matter. WIMPs could be detected via their scattering off matter, in so-called direct detection experiments. During the past decade, the sensitivity of such experiments has improved by three to four orders of magnitude, but solid evidence for their existence is yet to come. In this talk, I will review the recent progress in direct dark matter detection experiments and discuss future prospects.
Speaker: Jianglai Liu (Shanghai Jiao Tong University) -
09:30
First Results from the XENON1T Dark Matter Experiment 15m
XENON1T is a dual-phase time-projection chamber, designed to detect dark matter particle interactions within a 2-ton liquid-xenon target with unprecedented sensitivity. The detector, located at the Laboratori Nazionale del Gran Sasso, has been fully operational since May 2016, including regular calibrations, background studies, and a continuously improving xenon purity. The ongoing acquisition of science data began in November 2016. A summary of the status, detector performance, and new results from the first science run of the XENON1T experiment will be presented.
Speaker: Dr Michelle Galloway (Universität Zürich) -
09:45
Darkside Status and Prospects 15m
DarkSide uses dual-phase Liquid Argon Time Projection Chambers to search for WIMP dark matter. The current experiment, DarkSide-50, has a 50-kg-active-mass TPC surrounded by a borated-liquid-scintillator neutron detector and a water Cherenkov detector. DarkSide-50 has been running continuously since 2013, initially with atmospheric argon and then, starting in mid-2015, with argon from underground. The underground argon (UAr) is measured to contain lower Ar-39, the largest source of background, than atmospheric argon by a factor of >1000. After initial analyses of 50 live-days of atmospheric argon and 70 live-days of UAr, we have now collected 500 live-days of additional WIMP search data with UAr. This is being analyzed in a blind analysis. The proposed next stage of the DarkSide program is DarkSide-20k, a 20-tonne fiducial mass TPC designed to have background well below that from coherent scattering of solar and atmospheric neutrinos.
Speaker: Jeff Martoff -
10:00
Search for Low Mass Dark Matter Particles with the CRESST Experiment 15m
It has been suggested by several astronomical observations that dark matter contributes 27 % to the overall energy density of our universe but no particle candidates have been observed yet. The CRESST experiment aims to directly detect dark matter particle elastically scattering off nuclei. The CRESST-II detector modules are based on CaWO4 crystals which are operated at mK temperatures. The nuclear recoil energy thresholds for the CRESST-II detectors Lise and TUM40 are 0.3 keV and 0.6 keV, respectively. Such low energy thresholds make CRESST ideally suited for the detection of low-mass dark matter particles. Further increase in sensitivity is expected with CRESST-III detectors aiming at a threshold of 0.1 keV. In this talk, we will present our results on the search for the dark matter obtained with the detector modules Lise and TUM40 of CRESST-II. An analysis conducted on the search for dark photons as dark matter candidates will be presented. We will discuss the status of CRESST-III Phase 1 which started taking data last year. In addition to the low threshold, radio purity of the crystals is another important factor for the detection of dark matter particles. To acquire a detailed understanding of the backgrounds measured by the detectors, a Geant4 simulation of the electromagnetic backgrounds was carried out for the TUM40 detector module. The simulation includes backgrounds coming both from inside the crystal and from outside. The information taken from the background simulation will be vital for the second phase of the CRESST-III experiment.
Speaker: Cenk Turkoglu (Austrian Academy of Sciences (AT)) -
10:15
New results from LUX 15m
Two phase xenon time projection chambers have a number of attractive characteristics for their use in rare event searches. This is the case for the Large Underground Xenon (LUX) experiment, resulting in interesting new results. TPCs have been traditionally used in dark matter searches for nuclear recoils, and LUX reported the most sensitive limits to date for spin-independent and spin-dependent WIMP-neutron interactions for masses above 4 GeV/c2. Nevertheless, the low radioactivity background for electronic recoils of these devices makes them also highly attractive as a technology for use in searches that result in electron recoils. For example, LUX can probe for both axions coming from the Sun and axion-like particles (ALPs) moving within our Galaxy, arising from coupling to electrons via the so-called axio-electric effect. Although theoretically well motivated, axions have yet to be detected experimentally. We present the first results of the axion and ALP search with the LUX experiment. LUX data have also been used to set an upper limit on the half life of the two-neutrino double electron capture from the K-shell of 124Xe. We present the analysis and some preliminary results for this search.
Speakers: Dr Alexandre Lindote (LIP), Alexandre Lindote (LIP) -
10:30
The LZ Dark Matter experiment 15m
The LUX-Zeplin (LZ) experiment is the most advanced next-generation direct detection experiment under construction to search for dark matter in the Universe. It contains a dual-phase liquid xenon time projection chamber with a total active mass of 7 tons. LZ is implementing various low background techniques to significantly reduce radioactive background and reach an unprecedented level of sensitivity to spin-independent WIMPs. For a WIMP mass of 40 GeV, a sensitivity of 2.3 × 10-48 cm2 is expected in 1,000 days of operation. LZ will be located at the Sanford Underground Research Facility (SURF) in South Dakota, at the same location as the recently completed LUX experiment. In this presentation, an overview of the experimental techniques and science reach will be presented.
Speaker: Prof. Wolfgang Lorenzon (University of Michigan) -
10:45
Generalizing Minimal Dark Matter: Millicharge or Decay 15m
The Minimal Dark Matter (DM) framework classifies viable DM candidates that are obtained by simply augmenting the Standard Model of particle interactions with a new multiplet, without adding new ad hoc symmetries to make the DM stable. The model has no free parameters and is therefore extremely predictive; moreover, recent studies singled out a Majorana SU(2) quintuplet as the only viable candidate. The model can be constrained by both direct and indirect DM searches, with present time gamma-ray line searches in the galactic center being particularly sensitive. It is therefore timely to critically review this paradigm and point out possible generalizations. We propose and explore two distinct directions. One is to abandon the assumption of DM electric neutrality in favor of absolutely stable, millicharged DM candidates. We explicitly study a few examples, and find that a Dirac SU(2) triplet is the candidate least constrained by indirect searches. Another possibility is to lower the cutoff of the model, which was originally fixed at the Planck scale, to allow for decays of the DM quintuplet. We analyze the decay spectrum of this candidate in detail and show that gamma-ray data constrain the cutoff to lie above the GUT scale.
Speaker: Eugenio Del Nobile -
11:00
Coffee break 30m
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11:30
WIMP theory review 30m
The complementarity of direct, indirect and collider searches for dark matter has improved our understanding concerning the properties of the dark matter particle. We will review the basic concepts that these methods rely upon and highlight what are the most important information they provide when it comes down to interpret the results in terms of Weakly Interacting Massive Particles (WIMPs). Later, we go over some of the latest results and developments emphasizing the implications to dark matter theory in a broad sense.
Speaker: Dr FARINALDO queiroz (Max Planck Institute for Nuclear Physics - Heidelberg) -
12:00
Axion as a non-WIMP dark matter candidate 30m
The axion arises as a pseudo Nambu-Goldstone boson from the spontaneous breaking of a hypothetical global Peccei-Quinn symmetry introduced to provide a solution to the strong CP problem of quantum chromodynamics. Due to the weakness of the coupling with ordinary matters, the axion is regarded as a viable candidate of dark matter of the universe. However, the estimation of the axion dark matter abundance is not so straightforward if we follow the evolution of the axion field in the context of inflationary cosmology. As a result, the prediction for the mass of axion dark matter depends strongly on the early history of the universe according to the detailed construction of underlying particle physics models. In this contribution, after a quick overview of non-WIMP dark matter candidates, we review recent developments of the theoretical estimation of the axion dark matter abundance and discuss their implications for present and future experimental tests.
Speaker: Kenichi Saikawa (Tokyo Institute of Technology) -
12:30
Saving the Higgs Portal for Singlet Scalar Dark Matter. 15m
The Higgs-portal model with a singlet scalar Dark Matter particle is one of the simplest extensions to the Standard Model that can reproduce the relic density. But unfortunately this model is strongly constrained by direct and indirect DM detection, as well as by collider physics. Most of the parameter space is already ruled-out and the rest will be explored in the next future. We show that a simple extension of the DM sector with a second scalar singlet enables a substantial opening of the allowed window in the parameter space.
Speaker: Javier Quilis (IFT) -
12:45
Naturalness and Dark Matter in the BLSSM 15m
We study the naturalness properties of the B − L Supersymmetric Standard Model (BLSSM) and compare them to those of the Minimal Supersymmetric Standard Model (MSSM) at both low (i.e., Large Hadron Collider) energies and high (i.e., unification) scales. By adopting standard measures of naturalness, we assess that, in presence of full unification of the additional gauge couplings and scalar/fermionic masses of the BLSSM, such a scenario reveals a somewhat higher degree of Fine-Tuning (FT) than the MSSM, when the latter is computed at the unification scale and all available theoretical and experimental constraints, but the Dark Matter (DM) ones, are taken into account. Yet, such a difference, driven primarily by the collider limits requiring a high mass for the gauge boson associated to the breaking of the additional U(1)$_{B−L}$ gauge group of the BLSSM in addition to the SU(3)$_{C}$ × SU(2)$_L$ × U(1)$_Y$ of the MSSM, should be regarded as a modest price to pay for the former in relation to the latter, if one notices that the non-minimal scenario offers a significant volume of parameter space where numerous DM solutions of different compositions can be found to the relic density constraints, unlike the case of the minimal structure, wherein only one type of solution is accessible over an ever diminishing parameter space. In fact, this different level of tension within the two SUSY models in complying with current data is well revealed when the FT measure is recomputed in terms of the low energy spectra of the two models, over their allowed regions of parameter space now in presence of all DM bounds, as it is shown that the tendency is now opposite, the BLSSM appearing more natural than the MSSM.
Speaker: Simon King (University of Southampton)
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Flavour and symmetries Room Mosaici-2 (Palazzo del Casinò)
Room Mosaici-2
Palazzo del Casinò
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09:00
Theory overview on FCNC B-decays 30m
LHCb experiment at CERN has recently reported a set of measurements on lepton flavour universality in b to s transitions showing a departure from the Standard Model predictions. I will review the main ideas recently put forward to make sense out of these intriguing hints. Focusing on the new physics explanation, I will discuss the correlated signals expected in other low- and high- energy observables, that could help clarify the mysterious signal.
Speaker: Admir Greljo (University of Zurich) -
09:30
LHC results on FCNC beauty decays 30m
Rare b-hadron decays, which proceed via flavour changing neutral current (FCNC) transitions, provide a powerful test of the Standard Model of particle physics. I will present a short review of recent results on rare FCNC transitions from the LHC experiments, and will discuss some interesting tensions that have started to appear between experimental measurements and the Standard Model predictions. I will also highlight areas where theoretical progress is needed to keep pace with increasing experimental precision.
Speaker: Thomas Blake (University of Warwick) -
10:00
Recent measurements of radiative and electroweak Penguin Decays at Belle 30m
Radiative and electroweak penguin B decays proceed through one loop diagrams at the lowest order. Since new particles beyond the Standard Model can enter in the loop, these processes are very sensitive to new physics. We will report on the recent results on inclusive and exclusive modes of radiative and electroweak penguin B meson decays, including $B \to X_s \gamma$, $K^* l^+ l^-$ and $h \nu \bar{\nu}$, based on the full data set of Belle containing 772 million $B\bar{B}$ pairs.
Speaker: Simon Wehle (DESY) -
10:30
Rare B decays at LHCb 15m
Rare decays are flavour changing neutral current processes that allow sensitive searches for phenomena beyond the Standard Model (SM).
In the SM, rare decays are loop-suppressed and new particles in SM extensions can give significant contributions.
The very rare decay Bs->mumu is in addition helicity suppressed and constitutes a powerful probe for new (pseudo) scalar particles.
Of particular interest are furthermore tests of lepton universality in rare b->sll decays.
The LHCb experiment is designed for the study of b-hadron decays and ideally suited for the analysis of rare decays due to its high trigger efficiency, as well as excellent tracking and particle identification performance.
Recent results from the LHCb experiment in the area of rare decays are presented, including tests of lepton universality and searches for lepton flavour violation.Speaker: Albert Puig Navarro (Universität Zürich (CH)) -
10:45
A Systematic Study of Discriminators between New Physics and Standard Model in $b \to s$ transitions 15m
Measurements of $b \to s$ transitions in semi-leptonic, leptonic and radiative decays of the the $B$ meson has come of age with several collider and flavour-factory experiments focusing on these over the past years. While the inclusive and leptonic channels have been computed to relatively high precision, the exclusive decays are fraught with uncertainties stemming from both non-factorizable and factorizable parts of the matrix element. Since all these modes test overlapping components of a common short distance structure and are hence correlated, the uncertainties in the matrix element make it difficult to rightfully claim the presence or absence of new physics contributions through a global analysis of these observables. Following our previous work (arXiv:1512:07157), we expand our analysis to include all measured decay modes and try to establish discriminators between possible contributions from new physics and those from the matrix elements which have a richer helicity structure and should follow a signature kinematic distribution.
Speaker: Mauro Valli (INFN Rome) -
11:00
Coffee break 15m
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11:15
New physics searches with EW penguins and radiative B decays at LHCb 15m
Rare b->s(gamma,ll) decays are flavour changing neutral current processes that are forbidden at the lowest perturbative order in the Standard Model (SM).
As a consequence, new particles in SM extensions can significantly affect the branching fractions of these decays and give rise to new sources of CP-violation.
The LHCb experiment is ideally suited for the analysis of rare decays due to the large cross-section for bbbar production at the LHC, as well as its high trigger efficiency and excellent tracking and particle identification capabilities.
Recent results from the LHCb experiment in the area of semileptonic and radiative b->s transitions are presented and their interpretation is discussed.Speaker: Carla Marin Benito (University of Barcelona (ES)) -
11:30
Lepton Flavor (Universality) Violation in B Meson Decays 15m
Lepton Flavor (Universality) Violation in B Meson Decays
Even though the LHC searches so far did not unveil the new physics particles, the B-physics experiments at LHCb, BaBar and Belle hint towards deviations from Lepton Flavor Universality in both the tree-level and loop-induced B meson semileptonic decays. I will briefly review the models that can address these puzzles, propose one new model and discuss the main predictions that can be tested at LHCb and/or Belle-II. Particular emphasis will be given to Lepton Flavor Violation in B meson decays, which offer a very clean alternative to test the proposed New Physics scenarios.
Speaker: Mr Olcyr Sumensari (LPT Orsay) -
11:45
Results on Bs,d ->mumu decays and measurement of P5' and P1 parameters in B0->K* mu mu decay 15m
Phenomena beyond the standard model (SM) can manifest themself indirectly, by affecting the production and decay of SM particles. The decay B0->K* mu mu is a flavor-changing neutral current (FCNC) process particularly sensitive, since it is heavily suppressed in the SM. Recent results from LHCb collaboration show a tension with respect SM prediction of more than 3 sigmas. We will present results of an angular analysis done by the CMS experiment at the LHC, using p-p data collected at sqrt(s)=8 TeV, corresponding to an integrated luminosity of L=20 fb^-1. The analysis is focused to measure the angular parameter P5', as well as P1, as a function of the di-muons invariant mass.
Speaker: Stefano Lacaprara (INFN sezione di Padova) -
12:00
Rare FCNF radiative leptonic decays $B\to \gamma l^+ l^-$ 15m
We report our recent results on rare radiative leptonic decays $B\to \gamma l^+ l^-$ ($l=\mu,e$) in the Standard Model. All necessary $B\to \gamma$ transition form factors induced by the flavour-changing axial, vector, tensor, and pseudo-tensor $b\to s,d$ transitions are calculated within the relativistic dispersion approach based on the constituent quark picture. Making use of the updated predictions for the form factors, we provide branching ratios and various differential asymmetries in these decays.
Speaker: Dmitri Melikhov (HEPHY) -
12:15
Recent searches for beyond-SM effects in $B$-meson decays at BaBar 15m
In the recent past, several hints of inconsistencies between experimental results and theory predictions in the framework of the Standard Model (SM) have been obtained from measurement of $B$-meson decays, though no beyond-SM (BSM) effects have been observed yet.
We report here about a few recent searches for BSM effects in B-meson decays performed with the full BaBar data sample, collected at the energy of the $\Upsilon$(4S) resonance, which corresponds to 471 million $B\bar{B}$ pairs.
Among these, measurements of semileptonic decays involving the tau lepton that evidenced a significant discrepancy with the SM predictions, and of the rare flavour changing neutral current processes $B \to K^{(*)} l^+l^-$ where $l = e, \mu, \tau$. The latter, highly suppressed in the SM, occur at lowest order via 1-loop diagrams, and contributions from virtual particles in the loop allow one to probe large mass scales at relatively low energies. In particular, the decays $B \to K^* e^+e^-$ and $B \to K^* \mu^+\mu^-$ (both charged and neutral modes) are studied using an angular analysis to extract the quantities $A_{FB}$ and $F_L$, and the quantity $P_2$, which is subject to smaller theoretical uncertainties and is more sensitive to non-SM contributions. We also present a search for the not yet observed $B^+ \to K^+ \tau^+ \tau^-$ decay.Speaker: Gerald Eigen (University of Bergen (NO)) -
12:30
Studies of missing energy decays of B meson at Belle II 15m
The Belle II experiment at the SuperKEKB collider is a major upgrade of the KEK ``B factory'' facility in Tsukuba, Japan. The machine is designed for an instantaneous luminosity of 8x10^35 cm^-2s^-1, and the experiment is expected to accumulate a data sample of about 50 ab^-1 in five years of running. With this amount of data, decays sensitive to physics beyond the Standard Model can be studied with unprecedented precision. One promising set of modes are physics processes with missing energy such as B^+ to tau^+ nu, B to D^() tau nu, and B to K^() nu nu-bar decays.
The B--> K^() nu nu-bar decay provides one of the cleanest experimental probes of the flavour-changing neutral current process b-->s nu nu-bar, which is sensitive to physics beyond the Standard Model. However, the missing energies of the two neutrinos in the final state makes the measurement challenging and requires full reconstruction of the spectator B meson in e^+ e^---> Upsilon(4S)--> BBbar events. Observation of the B--> K^() nu nu-bar decay will become possible with the large data set to be collected by the upgraded Belle II experiment running at the Super-KEKB accelerator in Japan. A challenge of this analysis will be understanding and suppressing backgrounds. This talk discusses such backgrounds and the expected sensitivity of Belle II for this rare decay.
Speaker: Elisa Manoni (Universita e INFN, Perugia (IT)) -
12:45
New physics searches with heavy flavour observables at ATLAS 15m
New and recent results from the ATLAS programme of studies in EW physics with open beauty are presented. FCNC processes are sensitive to NP contributions, in particular through additional electroweak loop amplitudes. The angular analysis of the decay of Bd -> K* mu mu for a number of angular coefficients are measured as a function of the invariant mass squared of the di-muon system for data collected at 8 TeV. Comparison is made to theoretical predictions, including for the observable P’5, for which there has been recent tension between theory and experiment.
Speaker: Umberto De Sanctis (INFN e Universita Roma Tor Vergata (IT))
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Higgs and new physics: Higgs Sala Perla (Palazzo del Casinò)
Sala Perla
Palazzo del Casinò
Convener: Ivica Puljak (Technical University of Split FESB)-
09:00
Measurement of the Higgs boson couplings and properties in the diphoton, ZZ and WW decay channels using the ATLAS detector 15m
The latest results on the measurement of the Higgs boson couplings and properties in the diphoton, ZZ and WW decay channels with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
Speaker: Ruchi Gupta (Southern Methodist University (US)) -
09:15
Measurement of properties of Higgs boson decaying to pairs of W and Z bosons at 13 TeV with the CMS experiment 15m
The studies on the properties of Higgs boson in H->ZZ->4l (l = e, μ) and H->WW->eνμν decay channels based on the data collected with the CMS experiment in Run2 are presented. The reported results include studies of the Higgs boson production modes using H->ZZ and H->WW decay channels, as well as measurements of the Higgs boson mass, signal strength, fiducial differential cross sections for its production in pp collisions, and anomalous HZZ couplings in H->ZZ decay channel.
Speaker: Muhammad Bilal Kiani (Universita e INFN Torino (IT)) -
09:30
The Latest CMS results on Higgs boson decaying to two photons with 13 TeV data 15m
The latest results of the measurement of the Higgs boson decaying into two photons with the full 2016 data will be presented. The analysis is performed using the dataset recorded by the CMS experiment at the LHC from pp collisions at centre-of-mass energies of 13 TeV corresponding to an integrated luminosity of 35.9 1/fb.
Speaker: Michael Planer (University of Notre Dame (US)) -
09:45
Measurement of the SM Higgs boson mass in the diphoton and 4l decay channels using the ATLAS detector 15m
One of the fundamental properties of the Higgs boson, it's mass, is measured by way of studying the invariant mass of the 4l and diphoton decay channels with about 36fb-1 of data collected by the ATLAS experiments. Since in this channel the final state can be reconstructed as invariant mass peak with a good experimental resolution this measurement can be done in a model independent way and used as an input to compare other measurement properties with the SM predictions.
Speaker: Karolos Potamianos (DESY) -
10:00
Inclusive search for boosted Higgs bosons using H → bb decays with the CMS experiment 15m
We present an inclusive search for a Higgs boson with high transverse momentum decaying to a bottom-antibottom quark pair in pp collisions using the 2016 data sample corresponding to 35.9fb−1collected by the CMS experiment at LHC. High pT Higgs bosons candidates are reconstructed in a single jet with opening angle corresponding to R = 0.8 (AK8 jet). Jet substructure and dedicated b-tagging techniques are then used to identify boosted Higgs boson to bb.
Speaker: Caterina Vernieri (Fermi National Accelerator Lab. (US)) -
10:15
Probing light-quarks Yukawa couplings & new physics in Higgs + jet(b-jet) studies 15m
We suggest that the exclusive Higgs + light (or b) jet production at the LHC,
$pp \to h+j(j_b)$, is a rather sensitive probe
of the light-quarks Yukawa couplings and of new physics (NP) in the
Higgs-gluon $hgg$ and quark-gluon $qqg$ interactions.
We study the Higgs $p_T$ distribution in $pp \to h+j(j_b)$, employing non-differential observables
to probe the different types of NP relevant for this process, which we parameterize
either as scaled SM couplings (the kappa-framework) and/or
through new higher dimensional effective operators (the SMEFT framework).
We find that the exclusive $h+j(j_b)$ production
at the 13 TeV LHC is sensitive to various NP scenarios,
with typical scales ranging from a few to O(10) TeV, depending
on the flavor, chirality and Lorentz structure of the underlying physics.Speaker: Dr Shaouly Bar-Shalom (Technion, Israel) -
10:30
Results for SM Higgs decaying to bottom quarks or tau pairs 15m
The latest results from CMS on the study of SM Higgs decaying to tau pair and search for SM Higgs decaying to bottom quarks will be discussed. These results are based on the analysis of p-p collisions at 13 TeV, collected from CMS in the year 2016.
Speaker: Michele De Gruttola (CERN) -
10:45
Measurement of fermionic couplings of the SM Higgs boson using the bb, tautau and mumu decay channels with the ATLAS detector 15m
The latest results on the measurement of the cross sections and couplings of the Higgs boson in the fermionic decay channels to bb, tautau and mumu with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
Speaker: Song-Ming Wang (Academia Sinica (TW)) -
11:00
Coffee break 30m
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11:30
Determination of the Higgs boson properties with the ATLAS detector. 15m
The results obtained from the different decay channels are combined to study the properties of the Higgs boson production and decay, and test the SM theoretical precision with increased accuracy, using about 36 fb-1 of p-p collisions data collected at 13 TeV.
Speaker: Tamara Vazquez Schroeder (McGill University (CA)) -
11:45
Search for rare and exotic Higgs boson decays at CMS 30m
Recent results on CMS searches for exotic decays of the Higgs boson H(125) will be presented in this talk including searches for invisible and quasi invisible decays, lepton flavour violating ($e\mu$, $e\tau$, $\mu\tau$) decays, and decays to light scalars. The current status of searches for rare decays of standard model Higgs boson will also be summarized.
Speaker: Nabarun Dev (University of Notre Dame (US)) -
12:15
Search for non-standard, rare or invisible decays of the Higgs boson with the ATLAS detector. 15m
Some theories predict Lepton Flavour Violating decays of the Higgs boson, while other predict enhanced decay rates in rare modes like Z-photon, J/Psi-photon and Phi-photon or into invisible particles. Such decays are searched for using about 36 fb-1 of p-p collisions at 13 TeV.
Speaker: Paul Thompson (University of Birmingham (GB)) -
12:30
Search of a high mass neutral Higgs boson in fermion final states with the ATLAS detector. 15m
Several theories, like the Minimal Supersymmetric Standard Model, predict a high mass neutral Higgs boson with a significant decay rate into the bb, mu-mu or tau-tau final states. The search for a scalar resonance in fermion decay channels is presented, using about 36 fb-1 of p-p collisions at 13 TeV.
Speaker: Gaetano Barone (Brandeis University (US)) -
12:45
Latest results on searches for MSSM Higgs Search and Beyond at CMS 15m
A summary of recent progress of MSSM Higgs searches in CMS experiment. And also including Higgs like resonance searches with other BSM models, for example 2HDM, Gravitons, etc.
Speaker: Chayanit Asawatangtrakuldee (Deutsches Elektronen-Synchrotron (DESY))
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Heavy ion physics Room Mangano (Palazzo del Casinò)
Room Mangano
Palazzo del Casinò
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09:00
Quarkonia in heavy ion collisions 15m Room Mangano
Room Mangano
Palazzo del Casinò
Quarkonium has been regarded as one of the golden probes to identify the phase transition from confined hadronic matter to the deconfined quark-gluon plasma (QGP) in heavy-ion collisions. Recent theoretical developments in the study of the J/ψ and ϒ families at the energies of Large Hadron Collider (LHC) are reviewed. In particular, the possible implications related to the production and propagation of quarkonia in proton-nucleus collisions are discussed. A special emphasis is put on the excited states such as the ψ′, Υ(2S) and Υ(3S).
Speakers: Prof. Elena Ferreiro (University of Santiago de Compostela), Elena Gonzalez Ferreiro (Universidade de Santiago de Compostela (ES)), Elena Gonzalez Ferreiro (Universidad de Santiago de Compostela) -
09:15
Suppression of heavy quarkonia in pA and AA collisions 15m Room Mangano
Room Mangano
Palazzo del Casinò
In this talk we present our results on production of heavy quarkonia in $pA$ and $AA$ collisions in the color dipole approach. We analyze dynamics of quarkonium inside nuclear matter, and assess nuclear suppression due to shadowing and absorption, as well as consider novel multinucleon production mechanism. The contribution of this new mechanism explains why the measured nuclear effects remain essentially unchanged within the energy range from RHIC to the LHC.
We demonstrate that the suggested approach can simultaneously explain a relatively small nuclear suppression of $J/\psi$ and $\Upsilon$ production, as well as a strong suppression of $\psi(2S)$ observed at RHIC and LHC in proton-ion collisions.
Speaker: Marat Siddikov (Universidad Santa Maria) -
09:30
Quarkonium production in nucleus-nucleus collisions with ALICE at the LHC 15m Room Mangano
Room Mangano
Palazzo del Casinò
ALICE is the LHC experiment dedicated to the study of high energy heavy-ion collisions, where the formation of a hot and dense strongly-interacting medium, a Quark-Gluon Plasma (QGP), is expected. Considerable theoretical and experimental efforts have been invested in the last 30 years to study the properties of the QGP. One of the signals of QGP formation is the suppression of quarkonia, bound states of quark-antiquark pairs, due to color Debye screening. Measurements from Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV and $\sqrt{s_{\rm NN}}$ = 5.02 TeV revealed a suppression of quarkonium yields in central collisions, compared to binary-scaled pp collisions. However, the magnitude of the suppression is smaller than what was observed at lower energies at the SPS and RHIC, indicating that charmonium (re)generation via the (re)combination of charm and anti-charm quarks plays an important role at LHC energies. The measurement of elliptic flow of J/$\psi$ further constrains the interplay between charmonium suppression and (re)generation mechanisms in Pb-Pb collisions. Bottomonia measurements in heavy-ion collisions shows a stong suppression effect with very little or no (re)generation of bottomonia from the medium or phase boundary.
Differential measurements of the nuclear modification factor of J/$\psi$, $\psi$(2S) and $\Upsilon$ will be presented as a function of centrality, transverse momentum and rapidity for Pb-Pb collisions at $\sqrt{s_{rm NN}}$ = 5.02 TeV. Measurements of the $\psi$(2S) over J/$\psi$ ratio as a function of centrality and transverse momentum will also be shown. The results on the J/$\psi$ $\langle p_{\rm T}\rangle$ and $\langle p_{\rm T}^2\rangle$ as a function of centrality will be presented. We will also report the latest results on J/$\psi$ elliptic flow in \mbox{Pb-Pb} collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV. A comparison of the ALICE results with model predictions and with other experimental measurements will be presented.
Speaker: Indranil Das (Saha Institute of Nuclear Physics (IN)) -
09:45
Measurement of quarkonia production in heavy-ion collisions with the ATLAS detector 15m Room Mangano
Room Mangano
Palazzo del Casinò
The suppression of heavy quarkonia states in heavy-ion collisions is a phenomenon understood as a consequence of QGP formation in the hot, dense system formed in heavy-ion collisions at the LHC. In addition to hot matter effects in heavy-ion collisions , cold nuclear effects may also affect quarkonia production . Therefore, a full assessment requires detailed studies on the effects present in both A-A and p+A collisions. Based on p+Pb data collected in 2013 and pp and Pb+Pb data collected in 2015 at the LHC, the ATLAS experiment has studied prompt and non-prompt J/psi and psi(2S) productions as well as Upsilon production via the di-muon decay final states. The results are of the various measurements are discussed.
Speaker: Jakub Andrzej Kremer (AGH University of Science and Technology (PL)) -
10:00
Charmonium production in pPb and PbPb collisions at 5.02 TeV with CMS 15m Room Mangano
Room Mangano
Palazzo del Casinò
Charmonium states, such as the J/$\psi$ and $\psi$(2S) mesons, are excellent probes of the deconfined state of matter, the Quark-Gluon Plasma (QGP). The understanding of charmonia production in PbPb collisions requires the inclusion of many phenomena, such as dissociation in the QGP and statistical recombination, on top of cold nuclear matter effects (modifications of nPDFs, initial-state energy loss, nuclear break-up). Measurements of charmonia production in pPb collisions are crucial in order to disentangle the QGP-related effects from cold nuclear matter effects. In this talk, final results on the relative J/$\psi$ and $\psi$(2S) modification, based on the pp and PbPb data collected at \mbox{$\sqrt{s_{\mathrm{NN}}}$} $= 5.02$ TeV by CMS in 2015, will be reported. In addition, new prompt and nonprompt J/$\psi$ results in PbPb collisions at the same center-of-mass energy, including the nuclear modification factor $R_{AA}$, will be presented over a wide kinematic and centrality range ($3<$ \ensuremath{p_{\mathrm T}} $< 50$ GeV/$c$, $|y|<2.4$, and fine event-centrality intervals). The results are compared to those obtained at \mbox{$\sqrt{s_{\mathrm{NN}}}$} $= 2.76$ TeV over a similar kinematic range. Also new prompt $\psi$(2S) $R_{AA}$ results at \mbox{$\sqrt{s_{\mathrm{NN}}}$} $= 5.02$ TeV will be presented. Final prompt and nonprompt J/$\psi$ results in pPb collisions at 5.02 TeV will also be discussed, using the 2015 pp data taken at the same energy. At last, final results will be reported regarding prompt $\psi$(2S) meson production in pPb collisions at \mbox{$\sqrt{s_{\mathrm{NN}}}$} $= 5.02$ TeV, as a function of transverse momentum and rapidity and down to \ensuremath{p_{\mathrm T}} $= 4$ GeV/$c$.
Speaker: Andre Govinda Stahl Leiton (Centre National de la Recherche Scientifique (FR)) -
10:15
Quarkonium measurements in pPb and PbPb collisions at LHCb 15m Room Mangano
Room Mangano
Palazzo del Casinò
The LHCb experiment has the unique property to study heavy-ion interactions in the forward region (2 < η < 5), in a kinematic region complementary to the general purpose detectors. The detector has excellent capabilities for reconstructing quarkonia down to zero pT. Notably, it can separate the prompt and displaced components. In pPb collisions, both forward and backward rapidities are covered thanks to the possibility of beam reversal. Results include measurements of the nuclear modification factors and forward-backward ratios for charmonium states. These quantities are sensitive probes to study cold nuclear matter effects on quarkonium production. In 2015, LHCb also participated successfully for the first time in the Pb-Pb data-taking. The status of the forward prompt J/ψ nuclear modification factor measurement for up to semi-central lead-lead collisions will be shown.
Speaker: Francesco Bossu (Universite de Paris-Sud 11 (FR)) -
10:30
Charmonium production in p-Pb collisions with ALICE at the LHC 15m Room Mangano
Room Mangano
Palazzo del Casinò
Charmonium states play an important role as probes of the phase transition between hadronic and deconfined matter. In high-energy nucleus-nucleus collisions, where the formation of a plasma of quarks and gluons is expected, the charmonium production yields are modified by mechanisms as color screening and/or (re)combination of $\rm{c}$ and $\bar{\rm{c}}$ quarks. However, charmonium production is influenced also by cold nuclear matter effects as nuclear shadowing, gluon saturation, energy loss or the $\rm{c}\bar{\rm{c}}$ break-up in the medium. These mechanisms are studied in p-A collisions and their assessment is fundamental to evaluate the size of hot matter effects on charmonia.
ALICE measures charmonium states, in p-Pb collisions, down to zero transverse momentum at backward (-4.46$ < y_{\rm{cms}} < $-2.96) and forward (2.03$ < y_{\rm{cms}} < $3.53) rapidities in the dimuon decay channel and at mid-rapidity (-1.37$ < y_{\rm{cms}} < $0.43) in the dielectron one.
J/$\psi$ and $\psi$(2S) Run-1 results obtained in p-Pb collisions at $\sqrt{s_{\rm{NN}}}$= 5.02 TeV will be discussed. The J/$\psi$ nuclear modification factor ($R_{\rm{pA}}$), measured as a function of transverse momentum, rapidity and centrality, shows a sizeable kinematic dependence and its behaviour is in fair agreement with theoretical models including nuclear shadowing and energy loss. On the contrary, additional mechanisms related to final state interactions, are needed to describe the stronger suppression observed in the production of the loosely bound $\psi$(2S) state.
Preliminary Run-2 results on the J/$\psi$ and $\psi$(2S) production in p-Pb collisions at $\sqrt{s_{\rm{NN}}}$= 8.16 TeV, at forward and backward rapidities, will be presented, together with new mid-rapidity J/$\psi$ results at $\sqrt{s_{\rm{NN}}}$= 5.02 TeV. The charmonium $R_{\rm{pA}}$ will be compared to Run-1 results and to theoretical calculations.
Speaker: Biswarup Paul (Universita e INFN Torino (IT)) -
10:45
Open heavy flavour measurements in pPb collisions at LHCb 15m Room Mangano
Room Mangano
Palazzo del Casinò
Open heavy flavour hadron production is studied in pPb collisions at sqrt{s_{NN}}= 5 and 8 TeV with the LHCb experiment. The detector has excellent capabilities for particle identification and for the reconstruction of charm and beauty hadrons down to zero pT. Both forward and backward rapidities are covered thanks to the possibility of beam reversal. Results include measurements of the nuclear modification factors and forward-backward ratios for open heavy flavour hadrons. These measurements can provide important constraints to models for heavy quark production in heavy-ion collisions as well as the baseline for understanding quarkonium productions.
Speaker: Patrick Robbe (Universite de Paris-Sud 11 (FR)) -
11:00
Coffee break 30m
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Measurements of the Upsilon meson production in Au+Au collisions at the STAR experiment 15m Room Mangano
Room Mangano
Palazzo del Casinò
In ultra-relativistic heavy-ion collisions, creation of a novel state of matter—the quark-gluon plasma (QGP)—is expected. Studying the properties of this medium of deconfined quarks and gluons has been a focus of high energy nuclear physics and poses a significant experimental challenge. Among various probes, quarkonium production is a crucial one since their production is expected to be suppressed in the QGP due to the dissociation caused by the color screening effect, which is viewed as a direct evidence of the QGP formation. The dissociation process is dependent on the quarkonium binding energy and thus occurs for different states at different temperatures. By measuring the “sequential melting” of different quarkonium states in the medium, constraints on the QGP temperature can be inferred.
In this talk, we will present recent measurements on the $\Upsilon$ production in Au+Au collisions at $\sqrt{s_\text{NN}}=200$ GeV via both the di-muon and di-electron channels by the STAR experiment at RHIC. At RHIC energies, other effects affecting the quarkonium production—such as the inelastic interactions with final-state hadrons and coalescence of deconfined heavy quarks—are deemed much less significant for the $\Upsilon$ mesons than for the charmonia, which makes the bottomonium family a cleaner probe. The nuclear modification factors for both the ground and excited $\Upsilon$ states are reported as a function of collision centrality and transverse momentum, and compared with similar measurements at the LHC as well as theoretical calculations. Furthermore, the $\Upsilon$ productions in p+p and p+Au collisions at $\sqrt{s_\text{NN}}=200$ GeV are measured via the di-electron channel, which provide a refined p+p reference and quantification of the cold nuclear matter effect.
Speaker: Oliver Matonoha (CTU Prague) -
11:45
Heavy Flavor and Charmonia Production in the PHENIX experiment at RHIC 15m Room Mangano
Room Mangano
Palazzo del Casinò
Particles carrying heavy flavor are important probes of the properties of the Quark-Gluon Plasma (QGP) since they are produced in hard scattering during the earliest stages of nuclear collisions. In recent years, the PHENIX detector has collected data on p+p, p+Al, p+Au, He$^3$+Au, Cu+Au and Au+Au collisions at $\sqrt{s_{NN}}$=200GeV with the addition of silicon vertex detectors (VTX and FVTX). Analyses using the VTX for central rapidity (|y|<0.3) studies, and the FVTX for forward rapidities (1.2<|y|<2.2) have produced results on charm and bottom open heavy flavor production, as well as $\psi$’ to J/$\psi$ ratios. In this talk we will present recent results from PHENIX on open heavy flavor and charmonia in a variety of systems to extract information on cold nuclear matter and QGP properties at RHIC.
Speaker: Marzia Rosati (Iowa State University) -
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Physics with fixed target collisions in LHCb 15m Room Mangano
Room Mangano
Palazzo del Casinò
The LHCb experiment, thanks to its System for Measuring Overlap with Gas (SMOG), has the unique capability to operate in a fixed target mode with the LHC beams.
Reactions of incident LHC proton beams on noble gas targets have been recorded by the LHCb experiment at a center-of-mass energy of 110 GeV and within the center-of-mass rapidity range -2.3 < y* < 0.2. Results on anti-proton production as well as open and hidden heavy flavour hadrons production will be presented. These measurements can provide crucial constrain on particle production models of key interest for cosmic ray physics as well as for cold nuclear matter effects.Speaker: Lucio Anderlini (Universita e INFN, Firenze (IT)) -
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Low mass dielectron measurements in pp, p-Pb, and Pb-Pb collisions with ALICE at the LHC 15m Room Mangano
Room Mangano
Palazzo del Casinò
Low mass dielectron measurements in ultra-relativistic heavy-ion collisions
bring an important information on the properties of the hot and dense QCD medium and whole space-time evolution of the medium created in heavy-ion collisions.
Dielectrons in the mass range below 1 GeV/$c^2$, are from ordinary Dalitz and resonance decays of pseudoscalar and vector mesons. Dielectron invariant mass from short-lived vector mesons is sensitive to medium modifications of the spectral functions that are related to the chiral symmetry restoration at high temperatures. Dielectrons in the intermediate mass region from 1 to 3 GeV/$c^2$
originate mainly from the correlated electron pairs from semi-leptonic decays
of charm and beauty quarks, which carry the information on the heavy-quark energy loss. Thermal radiations from the medium contribute to the dielectron yields in a broad mass range and provide information on the thermodynamical properties of the medium.Low mass dielectrons have been measured with the ALICE detector at the LHC in pp collisions at $\sqrt{s}$ = 7 TeV and p-Pb collisions at $sqrt{s_{\rm NN}}$ = 5.02 TeV to study and disentangle effects due to the cold nuclear matter. In Pb-Pb collisions, the low mass dielectron mass spectra are measured for different pair $p_{\rm T}$ ranges.
In this talk, we will present a review of LHC Run-1 results from pp, p-Pb, and Pb-Pb collisions and we will discuss the production of virtual photons and heavy quarks. Furthermore, we will discuss the latest results of the analysis of Run-2 pp collisions at 13 TeV and report on the development of our analysis employing multivariable analysis techniques.
Speaker: Raphaelle Bailhache (Johann-Wolfgang-Goethe Univ. (DE)) -
12:30
The electromagnetic response of resonance matter and other strange observations 15m Room Mangano
Room Mangano
Palazzo del Casinò
The matter formed in central heavy-ion collisions at a few GeV per nucleon is commonly understood as resonance matter, a gas of nucleons and excited baryonic states with a substantial contribution from mesonic, mostly pionic excitations. Yet, in the initial phase of the reaction the system is compressed to beyond nuclear ground state density and hence substantial modifications of the hadron properties are expected to occur.
The HADES experiment explores strongly interacting baryon-rich matter at moderate temperatures using rare and penetrating probes. It operates in the beam-energy range of 1-2A GeV where comparatively long-lived states of compressed matter are created.
In this talk we present key results on in-medium properties of hadrons obtained by the High Acceptance DiElectron Spectrometer. The spectral distribution of virtual photon emitted from the collision zone of A+A collisions indicates strong medium effects beyond those resulting from a pure superposition of frequent but individual NN collisions. This observable, as well as the measured hadron abundances in the final state show features of a thermalized fireball. Baryon-driven medium effects influence significantly the rho meson in-medium spectral function and are considered essential in describing the low-mass dilepton spectra. While the measured abundance of all reconstructed particles are well described assuming thermalization, the double strange cascade Ξ(1321) production in A+A and p+A collisions shows however a sizeable enhancement above predictions of statistical hadronisation and transport model calculations. A deeper understanding of the microscopic properties of resonance matter requires systematic investigations of baryonic decays and these are studied in HADES making use of pion beams. This experimental program will be continued in the coming years with an upgraded HADES detector.Speaker: Tetyana Galatyuk (TU Darmstadt / GSI) -
12:45
SMASH: A new transport approach for FAIR energies 15m Room Mangano
Room Mangano
Palazzo del Casinò
The microscopic description of heavy-ion reactions at low beam energies is
achieved within hadronic transport approaches. In this talk a new approach
SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) is
introduced, verified, and applied to study particle production at $E_{Kin}$ =
0.4 - 2 A GeV in Au+Au collisions. First SMASH results for strangeness production are presented. Finally, an extension of SMASH with forced canonical thermalization in the high-density regions is demonstrated. This extension effectively accounts for many-particle collisions.Speaker: Mr Dmytro Oliinychenko (Frankfurt Institute for Advanced Studies)
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Neutrino physics Room Casinò (Palazzo del Casinò)
Room Casinò
Palazzo del Casinò
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09:00
Open problems in Neutrino Physics 30m
Present status of the major problems in neutrino physics is outlined. New approaches to their solutions, recent advances and developments will be reviewed. Landscape of the problems covers complete reconstruction of the neutrino mass and mixing spectrum, tests of nature of neutrino masses, searches for new physics beyond the SnuM, identification of the mechanism of neutrino mass and mixing generation, establishing possible connections between neutrino properties and other phenomena, elaboration of some still missing phenomenology, in particular, physics of collective oscillations in supernovae. Although most of these problems are well known, some new aspects emerge.
Speakers: Alexei Smirnov (Max-Planck-Institute for Nuclear Physics), Alexei Smirnov (ICTP) -
09:30
The latest T2K neutrino oscillation results 15m
T2K is a long-baseline neutrino oscillation experiment taking data since
2010. A neutrino beam is produced at the J-PARC accelerator in Japan and is
sampled at a Near Detector complex 280 m from the
neutrino production point and at the far detector, Super-Kamiokande.
Beams predominantly composed of muon neutrinos or muon anti-neutrinos have been
produced by changing the currents in the magnetic focusing horns.
The additional neutrino-mode data collected with T2K in 2017 have doubled the statistics relative to previous analysis releases.
This presentation will show the most recent T2K oscillation results
obtained from a combined analysis of the entire available data set in the
muon neutrino and muon anti-neutrino disappearance channels, and in the electron neutrino and electron anti-neutrino appearance channels. Using these data, we measure four
oscillations parameters: $\sin{\theta_{23}}$, $\sin{\theta_{13}}$, $|\Delta m^2_{32}|$ and $\delta_{CP}$, as well as the mass ordering.Speaker: Dr Leila Haegel (University of Geneva, Switzerland) -
09:45
Latest oscillation results from the NOvA experiment 15m
The NuMI Off-axis νe Appearance (NOvA) experiment is a two-detector, long-baseline neutrino oscillation experiment which addresses some of the main open questions in the neutrino sector through precision measurements of neutrino and antineutrino oscillations. NOvA uses the upgraded NuMI neutrino beam at the Fermi National Accelerator Laboratory and a highly active, finely segmented 14-kton far detector at Ash River, Minnesota. This highly granular design provides an outstanding event identification capacity, which allows for precision measurements of the oscillation parameters in both the appearance and disappearance of neutrinos and antineutrinos. In particular, NOvA will produce leading constraints on $\theta_{13}$, $\theta_{23}$, $|\Delta m^{2}_{\text{atm}}|$, the neutrino mass hierarchy and the CP-violation phase. In this talk, I will report on the latest oscillation results from NOvA, including muon neutrino disappearance, electron neutrino appearance as well as searches for sterile neutrinos using the neutral current spectrum.
Speaker: Dr Bruno Zamorano (University of Sussex) -
10:00
More results from the OPERA experiment. 15m
The OPERA experiment reached its main goal by proving the appearance of $\nu_\tau$ in the CNGS $\nu_\mu$ beam. A total sample of 5 candidates fulfilling the analysis defined in the proposal was detected with a S/B ratio of about ten allowing to reject the null hypothesis at 5.1 $\sigma$. The search has been extended to $\nu_\tau$-like interactions failing the kinematical analysis defined in the experiment proposal to obtain a statistically enhanced, lower purity, signal sample. One such interesting neutrino interaction with a double vertex topology is reported with a high probability of being a $\nu_\tau$ interaction with charm production. Based on the enlarged data sample the estimation of $\Delta$m$^2_{23}$ in appearance mode is presented. The search for $\nu_e$ interactions has been extended over the full data set with a more than twofold increase in statistics with respect to published data. The analysis of the $\nu_\mu\rightarrow\nu_e$ channel is updated and the implications of the electron neutrino sample in the framework of the 3+1 sterile model is discussed. An analysis of $\nu_\mu\rightarrow\nu_\tau$ interactions in the framework of the sterile neutrino model has also been performed. Finally, the results of the analysis of the annual modulation of the cosmic muon rate is discussed.
Speaker: Chiara Sirignano (University of Padova & INFN Padova) -
10:15
Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay 15m
The Daya Bay Reactor Neutrino Experiment consists of eight antineutrino detectors placed at different baselines from six 2.9 $\mathrm{GW_{th}}$ nuclear reactors. In this talk, I will present the evolution of the reactor antinetrino flux and spectrum with a 2.2 million inverse beta decay (IBD) sample collected from the Daya Bay’s near detectors over multiple fuel cycles in 1230 days. In addition to the disagreement of the observed flux and spectrum with reactor model predictions, a 3.1$\sigma$ discrepancy in the antineutrino flux variation with respect to the reactor fuel composition is observed. This discrepancy indicates a 7.8% overestimation of the predicted antineutrino flux from $^{235}\mathrm{U}$, suggesting that this fission isotope could be the primary contributor to the reactor antineutrino anomaly.
Speaker: Dr Ka Vang Tsang (SLAC) -
10:30
New results from RENO 15m
The Reactor Experiment for Neutrino Oscillation (RENO) started data-taking from August, 2011 and has sucdessfully measured the smallest neutrino mixing angle θ_13 in 2012 using 220 days of data by observing the disappearance of reactor antineutrinos. Antineutrinos from the six reactors at Hanbit Nuclear Power Plant in Korea are detected and compared by the two identical detectors located in the near and far distances from the reactor array center. In 2016, RENO has published an updated value of θ_13 and its first measurement of dm^2_ee based on energy dependent disappearance probability using 500 days of data. As of today, RENO has accumulated roughly 2000 days of data. In this talk, we present precise measurement of θ_13 and dm^2_ee using more data and improved systematic uncertainties. In addition, the recent results on the absolute reactor antneutrino flux, the 5 MeV excess of reactor neutrino spectrum, and the search for sterile neutrinos will be reported.
Speaker: Dr Hyunkwan Seo (Seoul National University) -
10:45
Duble Chooz latest results 15m
Nuclear reactor neutrinos were used on the first neutrino detection back in 1956. Since then our knowledge on neutrino physics haven't stopped broadening, and reactor neutrinos are still an important source of investigation. The Double Chooz (DC) is an experiment on neutrino oscillation based at Chooz nuclear power plant in France. Back in 2011 the DC collaboration reported an indication of non-zero theta_13, the last unmeasured angle of the neutrino PMNS mixing matrix, for the first time using reactor neutrinos. This was confirmed and measured by independent experiments in the following year. The DC collaboration has improved its analysis over the last years, in order to reduce the uncertainty on theta_13 measurement. The use of a second detector, the Near Detector (ND), operating ~400 meters from the reactors, improves the sensitivity by its nearly iso-flux location, in comparison to the Far Detector (FD), around the oscillation maximum ~1000 meters. Further improvement is achieved by making both detectors identical, in order to highly suppress the detection induced systematics. DC is taking data with both detectors since January of 2015, and boosted the event statistics by a novel approach on the Inverse Beta Decay (IBD) selection, considering neutrons captures on Gadolinium and Hydrogen simultaneously, that increases the fiducial volume by more than three times. The precision and accuracy of theta_13 have a leading impact on the current explorations of the neutrino CP violation phase and atmospheric mass ordering, when combining all neutrino oscillation measurements in a global analysis. Thus the redundancy of multiple theta_13 experiments is critical, ensuring the findings robustness. In this talk the latest analysis and results towards theta_13 measurement by DC will be showed. The efforts of the DC collaboration beyond theta_13, will also be addressed.
Speaker: Ines Gil Botella (Centro de Investigaciones Energéti cas Medioambientales y Tecno) -
11:00
Coffee break 30m
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11:30
Results from Borexino on solar and geo-neutrinos 15m
The Borexino experiment is running at the “Laboratorio del Gran Sasso” in Italy since 2007. Its technical distinctive feature is the unprecedented ultralow background of the inner scintillating core, which is the basis of the outstanding achievements accumulated by the experiment.
In this talk, after recalling the main features of the detector, the impressive solar data gathered so far by Borexino will be summarized. Altogether, such measurements put Borexino in the unique situation of being the only detector able to perform solar neutrino spectroscopy over the entire solar spectrum; the counterpart of this peculiar status in the oscillation interpretation of the data is the capability of Borexino alone to perform the full validation across the solar energy range of the MSW-LMA paradigm.
The recently released measurement of the time modulation of the detected neutrino signal induced by the Earth’s orbit eccentricity will be also reported.
The talk will be concluded with an account of the Borexino accomplishments in the geo-neutrino field, marked by the detection of the geo-neutrino signal with a significance as high as 5.9 sigma.Speaker: Rossi Nicola (LNGS) -
11:45
Neutrino physics and nuclear astrophysics: the LUNA MV project at Gran Sasso 15m
Nuclear astrophysics is an extremely rich field, correlated with many other research fields like observational neutrino physics, stellar modeling and cosmology.
As example, the precise knowledge of reactions producing neutrinos is mandatory to use neutrinos as probes of the stellar interior but at stellar energies the cross sections are usually extremely low, down to the femto-barn level.
The LUNA (Laboratory for Underground Nuclear Astrophysics) collaboration has exploited the low-background environment of the underground Gran Sasso Laboratory to perform direct measurements at the stellar energies. Among the most relevant LUNA contribution to the neutrino physics we remind: the exclusion of a resonance in the cross section of 3He+3He at solar energies that ruled out a nuclear explanation to the solar neutrino problem and the direct measurement down to 70 keV of the bottleneck reaction of the CNO cycle, 14N+p, that pointed out a cross section lower by a factor two than expected and halved the predictions of the solar CNO neutrino fluxes.
Presently, a new LUNA MV facility based on a 3.5 MV accelerator will be installed in the Hall B at the beginning of 2018: the aim is to study the key processes of helium and carbon burning such as the 12C+α reaction that shapes the outcomes of both Ia and core-collapse supernovae.
Contemporary a new effort will be devoted to improve the knowledge of solar reactions: the 14N+p reaction will be the first step of the new experimental program with the aim to extend the measurement over a wider energy range.
The error budget on 13N and 15O neutrino fluxes is dominated by the uncertainty (~10%) in the 14N+p cross section: an accurate measurement at LUNA MV will importantly contribute to constrain the chemical composition of the Sun.
The present talk is aimed to summarize all the LUNA results relevant to neutrino astrophysics and to present the scientific program related to the years 2018-2022.Speaker: Dr Sandra Zavatarelli (INFN - Sezione di Genova) -
12:00
Present status of neutrino cross section 15m
The present status of neutrino cross section physics is reviewed fo-
cusing on the recent theoretical developments in quasielastic scattering,
multi-nucleon contributions to the inclusive scattering and pion produc-
tion on nucleons and nuclei. A good understanding of these processes is
crucial to meet the precision needs of neutrino oscillation experiments.
Some of the challenges that arise in the consistent description of Mini-
BooNE and MINERvA recent data are discussed.Speaker: Luis Alvarez-Ruso -
12:15
Survey of neutrino-nucleus cross-section measurements from MINERvA 15m
Precision measurements of neutrino oscillation probabilities require an improved understanding of neutrino-nucleus interactions. MINERvA is a neutrino scattering experiment at Fermilab that utilizes the intense neutrino beam from the NuMI beam-line and a finely segmented scintillator based tracking detector to measure neutrino cross sections on various nuclear targets. MINERvA has published results using its low-energy data sets and is presently taking NOvA-era medium energy data. These results cover both exclusive and inclusive channels for muon and electron neutrino and anti-neutrino interactions. A summary of recent results from MINERvA will be presented.
Speakers: Arie Bodek, Arie Bodek (University of Rochester (US)) -
12:30
New measurements of neutrino-nucleus interactions in T2K 15m
The T2K long-baseline neutrino experiment has new neutrino cross-section measurements. In addition to being interesting in their own right, measuring neutrino cross sections is vital as they correspond to a major systematic uncertainty for neutrino oscillation analyses. In particular, the new results focus on exploiting the water targets
in the T2K off-axis near detector, ND280, updating our charged-current measurements with a wider phase space, addressing in more detail the neutrino interaction vertex, and other new measurements. This talk will give an overview of the T2K neutrino cross-section measurements, focusing on the latest results.Speaker: Dr Alex Finch (Lancaster University,UK) -
12:45
Latest Results From MicroBooNE 15m
MicroBooNE is a liquid-argon-based neutrino experiment, which is collecting data in the Fermilab Booster Neutrino Beam. MicroBooNE will directly probe the source of the anomalous excess of electron-like events in MiniBooNE, while also measuring low-energy neutrino cross sections and providing important R&D for future detectors. It is the first of three liquid argon TPC detectors planned for the Fermilab Short Baseline Neutrino program. This talk will give the status of MicroBooNE and present recent results on the detector technology, on event reconstruction techniques, and from neutrino beam data.
Speaker: Dr Martin Auger (LHEP BERN)
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QCD and hadronic physics Room Welles (Palazzo del Casinò)
Room Welles
Palazzo del Casinò
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New results on the multiplicity and centre-of-mass energy dependence of identified particle production in pp collisions with ALICE 15m
The study of identified particle production as a function of the proton-proton (pp) collision energy and multiplicity is a key tool for understanding similarities and differences between small and large interacting systems. We report on new measurements of the production of unidentified charged hadrons as well as of pions, kaons, protons, K$^{0}_{\rm S}$, $\Lambda$, $\Xi$, $\Omega$, K$^{*0}$ and $\phi$ measured in pp collisions for $\sqrt{s}$ ranging from 0.9 to 13 TeV. The multiplicity dependence of identified particle spectra and yields is presented for $\sqrt{s}$ = 5, 7 and 13 TeV and compared to results obtained in proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions. The results unveil intriguing similarities among systems and energies. While spectral shapes at high transverse momenta ($p_{\rm T} \geq 10$ GeV/$c$) do not evidence a significant dependence on event multiplicity, a strong evolution at low and intermediate $p_{\rm T}$ is observed. The production rates of strange hadrons are found to increase more than those of non-strange particles, showing an enhancement pattern with multiplicity which does not depend on the collision energy. Even if the multiplicity dependence of spectral shapes can be qualitatively described by commonly-used Monte Carlo event generators, the evolution of integrated yield ratios is poorly described by these models.
Speaker: Gyula Bencedi (Hungarian Academy of Sciences (HU)) -
09:15
Measurement of high-mass dilepton and diphoton production with the CMS-TOTEM Precision Proton Spectrometer 15m
The measurements of dilepton and diphoton production in photon-photon fusion with the CMS-TOTEM Precision Proton Spectrometer (CT-PPS) are presented. For the first time, exclusive dilepton production at high masses have been observed in the CMS detector while one or two outgoing protons are measured in CT-PPS using around 10~${\rm fb}^{-1}$ of data accumulated in 2016 during high-luminosity LHC operation. These first results show a good understanding, calibration and alignment of the new CT-PPS detectors installed in 2016. Preliminary results and expectations concerning the search for high-mass exclusive diphoton production are discussed.
Speaker: Ksenia Shchelina (Universita e INFN Torino (IT)) -
09:30
Measurement of Inelastic cross-section and Central Exclusive Production with the LHCb detector 15m
The forward acceptance of LHCb, 2.0 < y < 5.0, provides a complementary reach to the general purpose detectors on LHC. LHCb measurements of the inelastic cross-section and related results will be presented, as well as a comparison to Run 1 results.
The cross-section for central exclusive production of J/psi and Psi(2S) mesons at 13 TeV is measured using the LHCb detector. Proton dissociative backgrounds are significant reduced compared to previous measurements through the use of forward shower counters, recently installed for Run 2. Plans for future measurements are also presented to exploit the new Run2 dataset.Speaker: Michael Schmelling (Max-Planck-Gesellschaft (DE)) -
09:45
Low energy observables and exclusive production with the ATLAS Detector 15m
Low energy phenomena have been studied in detail at the LHC, providing important input for improving models of non-perturbative QCD effects. The ATLAS collaboration has performed several new measurements in this sector:
We present charged-particle distributions sensitive to the underlying event, measured by the ATLAS detector in proton-proton collisions at a centre-of-mass energy of 13 TeV. The results are corrected for detector effects and compared to predictions from various Monte Carlo generators.
In addition, we present studies on the correlated hadron production, as they are an important source for information on the early stages of hadron formation. In particular, an analysis of the momentum difference between charged hadrons in high–energy proton–proton collisions is performed in order to study coherent particle production. The results are compared to the predictions of a helical QCD string fragmenting model.
In the absence of forward proton tagging, exclusive processes can be distinguished in the central part of the ATLAS detector exploiting the absence of charged particles reconstructed in the inner tracking detector. We present a first measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at a center-of-mass energy of 13 TeV. The results show significant deviations from the pure QED prediction, which can be explained by proton-proton rescattering effects.
Speaker: Tim Martin (University of Warwick (GB)) -
10:00
Recent diffractive and exclusive results from CMS 15m
We present recent results of diffractive and exclusive measurements with the CMS experiment.
Speaker: Aleksandr Bylinkin (Moscow Institute of Physics and Technology State University (RU) -
10:15
Studies of the diffractive photoproduction of isolated photons at HERA 15m
The photoproduction of isolated photons has been measured using diffractive events recorded by the ZEUS detector at HERA. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 5 < $E_T^\gamma$ < 15 GeV and
−0.7 < $\eta^\gamma$ < 0.9, inclusively and also with a jet with transverse-energy and pseudorapidity in the ranges 4 < $E_T^{jet}$ < 35 GeV and −1.5 < $\eta^{jet}$ < 1.8, using a total integrated electron-proton luminosity of 456 pb$^{−1}$. A number of kinematic variables were studied and compared to predictions from the Rapgap Monte Carlo model. An excess of data is observed above the Rapgap predictions for $z_{pom}^{meas}$ > 0.9 where $z_{pom}^{meas}$ is the fraction of the longitudinal momentum of the colourless “Pomeron” exchange that is transferred to the photon-jet final state, giving evidence for direct-Pomeron interactions.Speaker: Aharon Levy (Tel Aviv University (IL)) -
10:30
Quarkonium production in pp collisions with ALICE at the LHC 15m
Quarkonia are mesons formed of either a charm and anti-charm quark pair ($\rm{J}/\psi$, $\psi(2S)$), or a beauty and anti-beauty quark pair ($\Upsilon$(1S), (2S) and (3S)). In high-energy hadronic collisions such as those delivered by the LHC between 2010 and 2016, quarkonium production results from the hard scattering of two gluons in a process which occurs very early in the collision followed by the hadronization of the heavy quark pair in a bound state. In pp collisions, quarkonium measurements help characterize production mechanisms. These same measurements also provide a reference baseline for p-A and A-A measurements which in turn quantify cold and hot nuclear properties of the Quark-Gluon Plasma (QGP). While charmonia are produced rather abundantly in such collisions, interpreting the measurement of their inclusive production is complicated by the presence of a sizable non-prompt contribution from the decay of b-hadrons. Bottomonia on the other hand have much smaller production cross sections but no non-prompt contribution. Moreover, their heavier mass makes them more suitable for perturbative QCD calculations.
In this presentation we will report on forward rapidity ($2.5 < y < 4$) $\rm{J}/\psi$ and $\psi(2S)$ production measured in pp collisions at center of mass energies $\sqrt{s}=5.02$ and $13$~TeV, using data collected at the LHC in 2015. Together with similar measurements performed at $\sqrt{s}=2.76$, $7$ and $8$ TeV, these results constitute a stringent test for models of charmonium production. In particular, they will be compared to NRQCD and FONLL calculations, which describe prompt and non-prompt charmonium production respectively. Results on forward-rapidity $\Upsilon$ production in pp collisions will also be discussed.
The availability at the LHC of the largest collision energy in pp collisions allows a significant advance in the measurement of J/ψ production as function of event multiplicity. The interesting relative increase of the J/ψ production rate in high multiplicity pp collisions observed with data at the LHC at s√=7 TeV and at RHIC at s√=200 GeV is studied now at unprecedented multiplicities for pp collisions. This will impose tight constrains on model calculations and improve the understanding on the origin of this enhancement. The newest measurement performed at mid-rapidity in pp collisions at s√ = 13 TeV in the dielectron decay channel, facilitated by triggering on high-multiplicity events, allows the comparison to J/ψ production in p-Pb collisions at similar multiplicities.
We will compare our newest measurements on the J/ψ yields as a function of event multiplicity in pp collisions at s√ = 13 and 5.02 TeV to those obtained in p-Pb collisions at sNN‾‾‾‾√ = 5.02 TeV at mid- and forward rapidity and at sNN‾‾‾‾√ = 8.16 TeV at forward rapidity.
The results will also be discussed in comparison to predictions from available theoretical models and to data at lower energies.Speaker: Jana Crkovska (Institut de Physique Nucleaire Orsay (FR)) -
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Coffee break 30m
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Jet production in pp and p-Pb collisions with the ALICE experiment at LHC 15m
Produced in a hard scattering an energetic parton will lead to a parton shower which will be fragmenting into a hadronic spray of particles called jet. The mass of the jet is sensitive to the initial virtuality of the parton at the origin of the shower. The jet fragmentation functions and their moments, describe the momentum distribution of hadrons inside a reconstructed jet. Their measurement is important for understanding the mechanisms of parton fragmentation. Well defined jet shapes observables, preserving collinear and infrared safety, like the first radial moment or the jet constituent momentum dispersion provide complementary information on the fragmentation process and can be compared to perturbative QCD (pQCD) calculations. This comparison can also be made with measurements of the differential jet production cross sec tion and of jet properties in proton-proton (pp) collisions. Proton-Lead collisions allow to probe cold nuclear matter effects and both systems are also used as a reference to measurements of the properties of the medium created in Heavy Ion Collisions.
The central barrel of the ALICE detector at the LHC has unique tracking capabilities enabling to measure charged particles down to transverse momenta as low as 150 MeV/c and provides particle identification (PID). Combining information from the ALICE Time Projection Chamber and from the Electromagnetic Calorimeters EMCAL/DCAL allows to precisely measure the jet energy.
An overview of recent results on jet physics in pp and p-Pb collisions from the ALICE experiment at the LHC will be presented. The results will be compared to pQCD calculations at leading and next-to-leading order.
Speaker: Alexandre Shabetai (Centre National de la Recherche Scientifique (FR)) -
11:45
D-meson and charmed-baryon measurements in pp and p--Pb collisions with ALICE at the LHC 15m
Measurements of charmed-hadron production in pp collisions are important to test predictions from perturbative QCD and provide an essential baseline for the studies in A--A collisions. Measurements in p--A collisions also allow studies of possible modifications of the charmed-hadron yields due to cold nuclear matter effects. The study of charm production as a function of the multiplicity of charged particles can give insight into multi-parton interactions and into the interplay between hard and soft processes. The charmed baryon-to-meson ratio is sensitive to hadronisation mechanisms in pp and p--A collisions and it will offer a unique probe of the role of coalescence and predicted presence of diquark states in A--A collisions.
ALICE measures hadrons containing charm quarks in wide momentum and rapidity ranges in pp and p--A collisions. We will present the recent results for D0, D+, D∗+ and D+s mesons reconstructed via their hadronic decays at mid-rapidity in pp collisions at s√ = 5.02, 7, 8 and 13 TeV and in p--Pb collisions at sNN‾‾‾‾√=5.02 TeV, collected with the ALICE detector during the LHC Run-1 and Run-2. In particular, we will show the production cross section, nuclear modification factor, multiplicity-dependent studies and the charm production measurement down to pT = 0.
We will report the first measurement of the pT-differential cross section of the Λ+c baryon in pp collisions at s√=7 TeV, and in p--Pb collisions at sNN‾‾‾‾√=5.02 TeV through the full reconstruction of two of its hadronic decay channels and the partial reconstruction of one of its semileptonic decay channels. We will also show the pT-differential cross section times branching ratio of the Ξ0c baryon measured in the decay channel Ξ0c→e+Ξ−νe in pp collisions at s√=7 TeV. The results will be compared with theoretical model predictions.Speaker: Annalisa De Caro (Universita e INFN, Salerno (IT)) -
12:00
Results on production and decay of B hadrons and onia and X(5568) state search in CMS 15m
We present precise measurements of decay properties of hadrons containing a b quark performed on the data collected by the CMS experiment at LHC. The lifetime is among the fundamental properties of particles and in heavy hadrons it is one of the important observables that allows to test the theoretical tools describing their physics. Some of the reported measurements are at the precision level of the world average for these properties.
We report measurements of the differential cross sections and polarizations of B hadrons and quarkonium states. These are important tools to investigate heavy-quark production mechanisms in QCD. The dependences on transverse momentum, rapidity, and particle multiplicity are investigated. Comparisons with theory expectations and among different collision energies are provided.
The evidence for an unexpected narrow Bs pi structure claimed by the D0 Collaboration and named X(5568) has triggered its search in other hadron collider experiments including CMS. Its interest resides in its possible interpretation as an hadronic state composed of four different quark flavours (udsb). The CMS search is performed using an integrated luminosity of 19.7fb^-1 of pp collisions at sqrt(s)=8TeV and provides the current most stringent Upper Limits on the ratio of the production rates of X(5568) and Bs multiplied by the unknown branching fraction of the Bs pi decay, given in two different kinematic regions defined on the basis of the transverse momentum of the Bs. The obtained CMS upper Limits contradict the D0 measurement and are in agreement with the results by the LHCb Collaboration.Speaker: Sergey Polikarpov (National Research Nuclear University MEPhI (RU)) -
12:15
Hidden and open heavy flavour production at LHCb 15m
Heavy flavour production measurements in proton-proton collisions are important tests of QCD.
We report on updated production cross-section measurement of quarkonia, open-charm, and open-beauty states. Other aspects related to the quarkonium production mechanisms, such as the associative production of quarkonium and jets, will be discussed.Speaker: Andrii Usachov (Universite de Paris-Sud 11 (FR)) -
12:30
Spectroscopy with heavy flavours at LHCb 15m
We report on the first observation of excited hadronic states in both the charm and beauty sector with special emphasis on the observation of five excited Omega_c states.
Similar techniques are used to analyse LHCb data for short-lived intermediate bound-states formed during the multi-body decay of b-hadrons.Speaker: Patrick Spradlin (University of Glasgow (GB)) -
12:45
Heavy flavour and Quarkonium production in pp collisions at ATLAS 15m
The latest results from ATLAS on heavy flavour and quarkonium production, including exotic states, are presented. This talk includes the measurement of B-hadron pair production, presented as a function of a variety kinematic variables between the two B-hadrons, providing important inputs to modelling of production via gluon splitting. Additional Insight into QCD models of quarkonium production and double parton scattering is also presented, through the production cross-section measurement of di-Jpsi and effective cross-section from double parton scattering.
Speaker: James William Walder (Lancaster University (GB))
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Top and electroweak Room Volpi (Palazzo del Casinò)
Room Volpi
Palazzo del Casinò
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09:00
Inclusive and differential W and Z boson cross sections with the CMS detector 15m
Measurements of single W and Z boson inclusive and differential production cross sections and their ratios with the CMS detector are presented. The results are compared to predictions from different Monte Carlo generators. A comparison of the results to predictions using different pardon distribution functions (PDF) tests the performance of PDFs.
Speaker: Kajari Mazumdar (Tata Inst. of Fundamental Research (IN)) -
09:15
High Precision Measurement of the differential vector boson cross-sections with the ATLAS detector 15m
Measurements of the Drell-Yan production of W and Z/gamma bosons at the LHC provide a benchmark of our understanding of perturbative QCD and probe the proton structure in a unique way. The ATLAS collaboration has performed new high precision measurements at center-of-mass energies of 7. The measurements are performed for W+, W- and Z/gamma bosons integrated and as a function of the boson or lepton rapidity and the Z/gamma* mass. Unprecedented precision is reached and strong constraints on Parton Distribution functions, in particular the strange density are found.
Z cross sections are also measured at center-of-mass energies of 8 eV and 13TeV, and cross-section ratios to the top-quark pair production have been derived. This ratio measurement leads to a cancellation of systematic effects and allows for a high precision comparison to the theory predictions.
The cross section of single W events has also been measured precisely at center-of-mass energies of 8TeV and 13TeV and the W charge asymmetry has been determined.
Speaker: Aaron James Armbruster (CERN) -
09:30
W boson polarization in vector boson scattering at the LHC 15m
Measuring the scattering of longitudinally-polarized vector bosons will represent a fundamental test of
Electroweak Symmetry Breaking.In addition to the challenges provided by low rates and large backgrounds,
there are conceptual issues which remain unresolved for the definition of a suitable signal.
Since vector bosons are unstable and can only be observed through their decay products,
the polarization states interfere among themselves.
Moreover, already at tree level, there are diagrams which cannot be interpreted as production
times decay of EW bosons but are necessary for gauge invariance.We discuss two possible ways to define a cross section for polarized $W$'s. In both cases all non resonant
diagram are dropped.
In the first one, the mass of the $\ell\nu$ pair is required to be close to $M_W$.
In the second one, an On--Shell Projection is performed.
The two methods give comparable outcomes.
We show that generating events with a specified $W$ polarization and exact decription of its decay leads to a
coherent definition of the polarization fractions.
In most cases, the sum of polarized distributions reproduces accurately the exact results.
In the absence of cuts this procedure reproduces the results of a
standard projection on Legendre polynomials. While the latter cannot be employed in the presence of selection
cuts on the charged leptons, a comparison of the data with singly polarized templates allows the extraction
of the polarization fractions in a realistic environment.We have compared the decay distribution of the charged leptons, after acceptance cuts,
in the SM, its Singlet extension and a Higgsless model.
The normalized shapes are sufficiently similar to allow an almost model
independent definition of the signal and measurement of the polarized components.The possibility of generating VBS events with a single $W$ polarization has been
introduced into PHANTOM.Speaker: Ezio Maina (Department of Physics - University of Torino) -
09:45
Differential measurements of the Drell-Yan cross-sections at 8 TeV withthe ATLAS detector 15m
Precision measurements of the Drell-Yan production of W and Z bosons at the LHC provide a benchmark of our understanding of perturbative QCD and electroweak processes and probe the proton structure in a unique way.
The ATLAS collaboration has performed a new precise triple differential cross-section measurement as a function of M(ll), dilepton rapidity and cosθ∗ defined in the Collins-Soper frame. This measurement provides sensitivity to the PDFs and the Z forward-backward asymmetry, AFB, which is derived and will be presented. This builds the foundation for a possible future extraction of the weak-mixing angle.
Speaker: Alexander Glazov (Deutsches Elektronen-Synchrotron (DE)) -
10:00
Measurements of the effective weak mixing angle in dimuon events at D0 15m
We present the measurements of forward-backward charge asymmetry $A_{FB} $ in
$p\bar{p}\rightarrow Z/\gamma^{*} \rightarrow \mu^+\mu^- $ events using $9.7 \ $fb$^{-1}$ of $ p\bar p$ data collected at $\sqrt s=1.96\ $TeV by the D0 detector at the Fermilab Tevatron collider. $A_{FB}$ is measured as a function of the invariant mass of the dimuon system to extract the effective weak mixing angle $\sin^2\theta^{lep}_{eff}$. In the context of the standard model, using the on-shell renormalization scheme where $\sin^2\theta_W = 1 - M_W^2/M_Z^2$, measurements of $\sin^2\theta^{lep}_{eff}$ yield indirect extractions of the W mass.Speaker: Siqi Yang (The University of Iowa (US)) -
10:15
Measurements and combination of the weak mixing angle at Tevatron and extraction of the W mass 15m
We present four measurements of forward-backward charge asymmetry $A_{FB} $ in
$p\bar{p}\rightarrow Z/\gamma^{*} \rightarrow e^+ e^-/\mu^+\mu^- + X$ events using $\sim 10\ $fb$^{-1}$ of $ p\bar p$ data collected at $\sqrt s=1.96\ $TeV by the D0 and CDF detectors at the Fermilab Tevatron collider. $A_{FB}$ is measured as a function of the invariant mass of the dilepton system to extract the effective weak mixing angle $\sin^2\theta^{lep}_{eff}$. We discuss the combination of these measurements and present the indirect extraction of the W mass in the context of the standard model.Speakers: Breese Quinn (University of Mississippi), Breese Quinn (University of Mississippi), Breese Quinn (University of Mississippi) -
10:30
Electroweak precision measurements with the CMS detector 15m
We report on the status of the precision measurements of electroweak parameters with W and Z bosons with the CMS detector. The effective electroweak mixing angle sin^{2}_{\theta} is extracted by measuring the forward-backward asymmetry in dilepton events near the Z boson mass region. Experimental and theoretical challenges needed for a high-precision W boson mass measurement are reported using a sample of Z->mumu events.
Speaker: Arie Bodek (University of Rochester (US)) -
10:45
Measurement of the W boson mass with the ATLAS detector 15m
A precise measurement of the mass of the W boson represents an important milestone to test the overall consistency of the Standard Model. Since the discovery of a Higgs Boson, the the W boson mass is predicted to 7 MeV precision, while the world average of all measurements is 15 MeV, making the improved measurement an important goal.
The ATLAS experiment at the LHC represents an ideal laboratory for such a precise measurement. Large samples of many millions of leptonic decays of W and Z bosons were collected with efficient single lepton triggers in the 7 TeV data set corresponding to an integrated luminosity of 4.6/fb. With these samples the detector and physics modelling has been studied in great detail to enable a systematic uncertainty on the measurement that approaches the statistical power of the data of 7 MeV per decay channel as far as possible.
Speaker: Stefano Camarda (CERN) -
11:00
Coffee break 30m
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11:30
The global electroweak fit: present status, constraints on new physics, and prospects at future colliders 15m
We review the status of the global electroweak fit in the Standard Model (SM), including the latest theoretical and experimental updates. We discuss in detail the consistency of the SM with current experimental data, and derive constraints on general new physics scenarios. These are compared and combined with the bounds obtained using Higgs boson observables measured at the LHC. Finally, we present the projection of the fit with the improvements expected at future e+ e- colliders. All the results have been obtained using the HEPfit code.
Speaker: Luca Silvestrini (INFN Rome) -
11:45
Update of the Global Electroweak Fit by Gfitter 15m
We present the status of the global fit to electroweak precision data. The fit includes the latest available hadron collider measurements of the top-quark and the W-boson masses, as well as newest higher-order theoretical calculations. A large set of numerical and graphical results as well as Standard Model compatibility tests are presented. The global electroweak fit is also used to constrain models of new physics. Among these the Two-Higgs-Doublet model (2HDM) is studied in detail. The constraints on the various 2HDM types from the electroweak precision data are augmented by combining them with the latest Higgs boson coupling measurements and measurements of flavour physics observables.
Speakers: Roman Kogler (Hamburg University (DE)), Thomas Peiffer (Hamburg University (DE)) -
12:00
Implications of strict gauge invariance for particle spectra and precision observables 15m
The discovery of the Higgs physics together with the excellent performance of the LHC allow to make precision tests of Brout-Englert-Higgs Physics.
At this level, it becomes important to fully understand the theory behind this physics. As was already pointed out more than 35 years ago, there is a paradox in the standard model: The elementary fields should not be the particles we observe, as they are unphysical, since they are gauge-dependent. Nonetheless, it appears that we see them. The resolution of this paradox shows that the standard model is a very special theory, where the description in both languages is (almost) identical.
However, this can drastically change beyond the standard model, even altering usual predictions of particle spectra. It could also subtly alter precision measurements within the standard model. This yields testable predictions, which can (mostly) be derived with little more effort than in standard phenomenology.
After sketching the underlying theory ideas, these predictions for experimental signatures will be presented.
Speaker: Axel Torsten Maas (University of Graz) -
12:15
Scheming in the SMEFT 15m
We discuss the constraints on the Standard Model Effective Field Theory inferred from global fits to electroweak data. In particular, we focus on two unconstrained combinations of Wilson coefficients that are present when the analysis is restricted to measurements of $\bar\psi\psi\rightarrow \bar\psi\psi$ scatterings. We show how these unconstrained directions arise due to a reparameterization invariance that characterizes $\bar\psi\psi\rightarrow \bar\psi\psi$ processes but is not respected in $\bar\psi\psi\rightarrow \bar\psi\psi\bar\psi\psi$ scatterings. Finally, we demonstrate that this invariance is independent of the choice of the input parameters, comparing the results obtained in the {$\hat{\alpha}_{\rm em}$, $\hat{m}_Z$, $\hat{G}_F$} input scheme with those of a {$\hat{m}_W$, $\hat{m}_Z$, $\hat{G}_F$} scheme, which we develop here. The talk is based on hep-ph/1701.06424.
Speaker: Ilaria Brivio (University of Copenhagen) -
12:30
Combined QCD and electroweak analysis of HERA data 15m
A simultaneous fit of parton distribution functions (PDFs) and electroweak
parameters to HERA data on deep inelastic scattering is presented. The input
data are the neutral current and charged current inclusive cross sections
which were previously used in the QCD analysis leading to the HERAPDF2.0
PDFs. In addition, the polarisation of the electron beam was taken into
account for the ZEUS data recorded between 2004 and 2007. Results on the
vector and axial-vector couplings of the Z boson to u- and d-type quarks,
on the value of the electroweak mixing angle and the mass of the W boson
are presented. The values obtained for the electroweak parameters are in
agreement with Standard Model predictions. The resulting sets of PDFs,
ZEUS-EW, are in agreement with HERAPDF2.0 and give a good description of
ZEUS data with polarisation taken into account.Speaker: Claire Gwenlan (University of Oxford (GB)) -
12:45
Fit of electroweak parameters in polarized deep-inelastic scattering using data from the H1 experiment 15m
Using inclusive DIS cross sections measured with the H1 experiment at HERA, electroweak parameters of the Standard Model are probed. The cross sections were determined using longitudinally polarized lepton beams, which enhances the sensitivity to the vector couplings of the light quarks. The quark couplings and the electroweak mixing angle are probed through the $\gamma/Z$ interference. This gives access to electroweak parameters in $t$-channel exchange at virtualities up to 10000 GeV$^2$.
Speaker: Zhiqing Philippe Zhang (LAL, Orsay (FR))
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Lunch break 1h 30m
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14:30
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18:28
Astroparticle physics Room Martinelli (Palazzo del Casinò)
Room Martinelli
Palazzo del Casinò
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14:30
Astroparticle Physics at the DUNE experiment 18m
The Deep Underground Neutrino Experiment (DUNE) experiment, a 40-kton underground liquid argon time-projection-chamber detector, will have unique sensitivity to the electron flavor component of a core-collapse supernova neutrino burst. We present expected capabilities of DUNE for measurements of neutrinos in the few-tens-of-MeV range relevant for supernova detection, and the corresponding sensitivities to neutrino physics and supernova astrophysics. Recent progress and some outstanding issues will be highlighted.
Speaker: Ines Gil Botella (Centro de Investigaciones Energéti cas Medioambientales y Tecno) -
14:48
The very high energy gamma-ray (and neutrino) Galactic Center diffuse emission 18m
We present a novel interpretation of the gamma-ray diffuse emission in the Galactic Center (GC) and the Central Molecular Zone (CMZ) regions.
This is based on a scenario assuming a harder scaling of the diffusion coefficient with rigidity in the inner Galaxy so to reproduce the radial dependence of the cosmic-ray (CR) spectral index recently inferred from Fermi-LAT.
We compare our model with H.E.S.S. and (for the fist time in this context) with PASS8 Fermi-LAT data which allows to cover the entire energy range from few GeV up to ~ 50 TeV and to infer the primary CR radial distribution above 100 GeV.
We find that the bulk of the Galactic ridge emission can be naturally explained by the interaction of the diffuse, steady-state Galactic CR sea interacting with the gas present in the CMZ. As a consequence, the evidence of a GC Pevatron is significantly weakened.
We will also discuss the implications of our results for high energy neutrino astronomy.Based on arXiv:1702.01124 (submitted to PRL) and 1504.00227 (published in ApJ L)
Speaker: Dario Grasso (INFN) -
15:06
M31 gamma ray emission - a closer look at different explanations 18m
A new measurement of a spatially extended gamma-ray signal from the center of M31
was published recently, reporting that the emission broadly resembles the so-called
Galactic center excess of the Milky Way (Ackermann et al. 2017, arXiv:1702.08602).
In this talk we discuss the possibilities that the signal originates from a
population of millisecond pulsars, or alternatively the annihilation of dark matter
particles. As an astrophysical interpretation in terms of millisecond pulsars
appears viable, we derive upper limits on the annihilation cross section in the
$b\bar{b}$/$\tau^-\tau^+-$channel of Weakly Interacting Massive Particles (WIMPs) in a mass range
from 1 GeV to 10 TeV, taking into consideration different spatial dark matter
density profiles and including the effect of substructure and adiabatic contraction.Speaker: Christopher Eckner (University of Nova Gorica) -
15:24
Astroparticle physics with ARGO-YBJ 18m
The ARGO-YBJ experiment was installed in the Tibet region of China, 4300 meters above sea level. It run continuously from November 2007 until February 2013, with the goal of observing astronomical gamma-ray sources in the energy range between a few hundred GeV and about 100 TeV, and primary cosmic rays in the energy range between about 1 TeV and a few PeV. The unique feature of the ARGO-YBJ detector was its full-coverage layout of Resistive Plate Chambers on an area of (78 x 74) m^2, with a guard ring around and a full area of 11000 m^2. The most important results obtained by ARGO-YBJ will be presented, with specific focus on the observation and monitoring of galactic and extragalactic gamma-ray sources and primary light-nuclei spectrum and knee.
Speakers: Paolo Camarri (University of Roma "Tor Vergata"), Paolo Camarri (INFN e Universita Roma Tor Vergata (IT)) -
15:42
Supernova remnants in the very--high--energy sky: prospects for CTA 18m
The Cherenkov Telescope Array is expected to lead to the detection of many new supernova remnants in the TeV and multiTeV range. In addition to the individual study of each, the study of these objects as a population can help constraining the parameters describing the acceleration of particles and increase our understanding of the mechanisms involved. Using Monte Carlo methods, the population of Galactic SNRs emitting TeV gamma rays can be simulated. The simulated population can be confronted with future observations to provide a novel test for the SNR hypothesis.
Speaker: Pierre Cristofari (Columbia University) -
16:00
Coffee break 30m
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16:30
Intepreting extragalactic backgrounds via angular cross-correlations 28m
We will discuss methods and results concerning the angular cross-correlation between sky-maps of the extragalactic background radiation in different wavelength bands.
The main goal of the study is to extract information on the clustering, redshift distribution and type of the unresolved non-thermal sources, especially at gamma-ray (and radio) frequencies.
We will show how this technique can be used to search for "new" populations of sources, including the one possibly provided by annihilation or decay of particle dark matter.Speaker: Dr Marco Regis (INFN - National Institute for Nuclear Physics) -
16:58
Search for tau neutrinos at PeV energies and beyond with the MAGIC telescopes 18m
The MAGIC telescopes, located at the Roque de los Muchachos
Observatory (2200 a.s.l.) in the Canary Island of La Palma,
are placed on the top of a mountain, from where a window of visibility of about $5^{\circ}$ in zenith and $80^{\circ}$ in azimuth is open in the direction of the surrounding ocean. This permits to search for a signature of particle showers induced by earth-skimming cosmic tau neutrinos in the PeV to EeV energy range arising from the ocean. We have studied the response of MAGIC to such events, employing Monte Carlo simulations of upward-going tau neutrino showers. The analysis of the shower images shows that air showers induced by tau neutrinos can be discriminated from the hadronic background coming from a similar direction. We have calculated the point source acceptance and the expected event rates, assuming an incoming tau neutrino flux consistent with IceCube measurements, and for a sample of generic neutrino fluxes
from photo-hadronic interactions in AGNs and GRBs. The analysis of about 30 hours of data taken toward the sea leads to a point source sensitivity for tau neutrinos at the level of the down-going point source analysis of the Pierre Auger Observatory, but the diffuse limit is less constraining with respect to the IceCube diffuse results for tau neutrinos.Speakers: Dr Dariusz Gora (Institute of Nuclear Physics PAN), Marina Manganaro (IAC - Instituto de Astrofísica de Canarias) -
17:16
Highlights of the ANTARES neutrino telescope results 18m
ANTARES is the first undersea neutrino telescope and, at present, the largest one in the Northern hemisphere. Its main goal is the search for high-energy astrophysical neutrinos. It consists of an array of photomultipliers tubes housed in so-called optical modules, detecting the Cherenkov light induced along the path of relativistic charged particles originated by neutrino interactions in and around the instrumented volume. ANTARES, has been acquiring data in its final configuration since 2008. The excellent optical properties of the sea water and the location of the telescope allow for the reconstruction of neutrino event direction with very good angular resolution, and for high sensitivity searching for possible sources in the region of the Galactic plane. The most recent results of ANTARES searches for neutrino point sources, for diffuse neutrino emission from several interesting regions, and for neutrinos from WIMP annihilation in massive objects like the Sun and the Galactic Center will be presented. Particular attention will be given to the multimessenger approach, presenting the wide program of combined searches in collaboration with astronomical observatories, with cosmic ray experiments and, recently, with the LIGO/VIRGO interferometers.
Speaker: Annarita Margiotta (Universita e INFN, Bologna (IT)) -
17:34
A Summary of Recent Updates in the Search for Cosmic Ray Sources using the IceCube Detector 18m
The IceCube detector has observed the first clear detection of a diffuse astrophysical high energy neutrino flux, however, the sources for these neutrinos have yet to be found. Hadronic interactions around cosmic ray accelerators result in both high energy gamma and neutrino fluxes for neutral and charged pion decays respectively. Observing cosmic ray sources with neutrinos provides unique evidence of the hadronic nature of these sources. Recently there have been many analyses from IceCube using multiple years of data for the detector in order to establish a neutrino source. These searches involve looking for a significant clustering of neutrinos from any direction or a strong correlation with a known source observed by other messengers also expected to emit a neutrino flux. These searches range from stacking searches involving populations of similar sources such as active galactic nuclei, to time-dependent searches targeting individual sources when they are in flaring states. We present here the most recent updates in the search for sources of extraterrestrial neutrinos using the latest methods and source information.
Speaker: Tessa Lauren Carver (Universite de Geneve (CH)) -
17:52
Constraining the Flavor Structure of Lorentz Violation Hamiltonian with the Measurement of Astrophysical Neutrino Flavor Compositions 18m
We study Lorentz violation effects to flavor transitions of high energy
astrophysical neutrinos. It is shown that the appearance of Lorentz violating
Hamiltonian can drastically change the flavor transition probabilities of
astrophysical neutrinos. Predictions of Lorentz violation effects to flavor
compositions of astrophysical neutrinos arriving on Earth are compared with
IceCube flavor composition measurement which analyzes astrophysical neutrino
events in the energy range between $25~{\rm TeV}$ and $2.8~{\rm PeV}$. Such a
comparison indicates that the future IceCube-Gen2 will be able to place
stringent constraints on Lorentz violating Hamiltonian in the neutrino sector.
We work out these expected constraints for different flavor structures of
Lorentz violating Hamiltonian. In some cases these expected constraints can
improve upon the current constraints obtained from other types of experiments
by more than two orders of magnitudes.Speaker: Prof. Guey-Lin Lin (National Chiao-Tung University, Taiwan)
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Detectors and data handling Room Amici (Palazzo del Casinò)
Room Amici
Palazzo del Casinò
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14:30
Upgrades to the ATLAS trigger system 15m
In coming years the LHC is expected to undergo upgrades to increase both the energy of proton-proton collisions and the instantaneous luminosity. In order to cope with these more challenging LHC conditions, upgrades of the ATLAS trigger system will be required. This talk will focus on some of the key aspects of these upgrades. Firstly, the upgrade period between 2019-2021 will see an increase in instantaneous luminosity to $3\times10^{34} \rm{cm^{-2}s^{-1}}$. Upgrades to the Level 1 trigger system during this time will include improvements for both the muon and calorimeter triggers. These include the upgrade of the first-level Endcap Muon trigger, the calorimeter trigger electronics and the addition of new calorimeter feature extractor hardware, such as the Global Feature Extractor (gFEX). An overview will be given on the design and development status the aforementioned systems, along with the latest testing and validation results.
By 2026, the High Luminosity LHC will be able to deliver 14 TeV collisions with an order of magnitude larger instantaneous luminosity, expected to reach7.5 √ó 10^34 cm‚àí2s‚àí1.
ATLAS is planning a series of upgrades to prepare for this even more challenging environment. This presentation will describe the baseline architecture for this upgrade, while also detailing on-going studies into new system components and their interconnections. The overall challenge here is to meet low latency and high data throughput requirements within the limits given by technological evolution. A discussion on the physics motivations and the expected performance based on simulation studies will be presented, together with the open issues and plans.Speaker: Francesca Pastore (Royal Holloway, University of London) -
14:45
Modernising ATLAS Software and Metadata 15m
ATLAS has embarked on a major program of development in its offline software framework and the indexing of the data. In this paper we outline the motivations for such major changes, based on expected CPU evolution in the next decade, the increasing need to use memory more efficiently, and the increase of data volume expected for the LHC Run 3. The offline software framework, Athena will develop into a new multithreaded version, AthenaMT. We describe the changes that have been implemented to deal with concurrency in terms of data flow within an event, restructuring of framework components for thread safety and how to handle non-event data, such as detector conditions. We also describe how ATLAS moved to the git source control system to allow a continuous integration and code review to maintain software quality. ATLAS produces over 50 PByte of data and simulation every year, these data need to be curated over their lifetime to allow discovery and retrieval, and to maintain their accessibility and analysability over time. We discuss the metadata infrastructure developed by the ATLAS collaboration to characterise these data at the event, dataset and container level, and its expected evolution for Run 3.
Speaker: Graeme Stewart (University of Glasgow (GB)) -
15:00
The upgrade of the forward Muon Spectrometer of the ATLAS Experiment: the New Small Wheel project 15m
The current innermost stations of the ATLAS endcap muon tracking system (the Small Wheel) will be upgraded in 2019 and 2020 to retain the good precision tracking and trigger capabilities in the high background environment expected with the upcoming luminosity increase of the LHC. The upgraded detector will consist of eight layers each of Resistive Micromegas (MM) and small-strip Thin Gap Chambers (sTGC) together forming the ATLAS New Small Wheels. Large area sTGC's up to 2 m2 in size and totaling an active area each
of 1200 m2 will be employed for fast and precise triggering. The required spatial resolution of about 100 $\mu$m will allow the Level-1 trigger track segments to be reconstructed with an angular resolution of approximately 1mrad. The precision cathode plane has strips with a 3.2mm pitch for precision readout and the cathode plane on the other side has pads to produce a 3-out-of-4 coincidence to identify passage of a track in an sTGC quadruplet, selecting which strips to read-out. The eight layers of MM detectors are arranged in multilayers of two quadruplets, for a total of about 1200 m2 detection planes. All quadruplets have trapezoidal shapes with surface areas between 2 and 3 m2. The readout elements consist of 300 $\mu$m wide strips with a pitch of ~450 $\mu$m for a total of 2.1 M readout channels. A spatial resolution better than 100 um independent of the track incidence angle is required.
The total number of trigger and readout channels is about 2.4 millions, and the overall power consumption is expected to be about 75 kW. The electronics design will be implemented in some 8000 front-end boards including the design of four custom front-end ASICs capable to drive trigger and tracking primitives with high speed sterilizers to drive trigger candidates to the backend trigger processor system. The construction procedures of sTGC's and MM's and of the electronic system will be reviewed along with the results obtained on full-size prototypes.Speaker: Paolo Iengo (CERN) -
15:15
ALICE forward rapidity upgrades 15m
The upcoming upgrade of the CERN LHC injectors during 2019-20 will boost the luminosity and the collision rate beyond the design parameters of several of the key ALICE detectors including the forward trigger detectors. The nominal Pb-Pb interaction and readout rate for ALICE after LS2 will reach 50 kHz. To face this challenge the Fast Interaction Trigger (FIT) is being designed and constructed. FIT will be the main forward trigger, luminometer, and collision time detector. It will also determine multiplicity, centrality, and reaction plane of heavy ion collisions.
The detector will consist of two arrays of Cherenkov radiators with MCP-PMT sensors and of a single scintillator ring. The arrays will surround the beam pipe on the opposite sides of the interaction point: at ~820 mm on the hadron absorber side and at ~3200 mm on the other side, where also the scintillator ring of a diameter of 1489 mm will be located. The resolution of the interaction time extracted from the Cherenkov arrays will be equal or better than 40 ps for low multiplicity events and better than 30 ps at higher multiplicities. The centrality and event plane resolution will be similar to those of the present ALICE apparatus. The first prototype of the Cherenkov module together with the frontend electronics are already installed and in operation at ALICE in parallel with the other forward detectors.
The presentation will contain a short introduction to FIT, followed by the latest refinements of the FIT geometry together with performance of the prototype, new modifications to the MCP-PMT sensor, electronics scheme with digital trigger and continuous readout, as well as the results of the FIT performance simulations.
Speaker: Maciej Slupecki (University of Jyvaskyla (FI)) -
15:30
Multi-Gigabit Wireless Data Transfer for High Energy Physics Applications 15m
The future of connectivity is wireless, and the HEP community is not an exception. The demand for high capacity data transfer continues to increase year over year at a significant rate. This is an on-going race where technology and applications developers push into higher and higher bandwidths. For example the tracking detectors require readout systems with several thousand links that has to handle a data transfer of multiple-gigabit/s each. Also, due to the high granularity of these detectors, stringent requirements are also specified on the space, material and power consumption. Wireless techniques have also developed extremely fast the last decade and are now mature for being considered as a promising alternative to cables and optical links that would revolutionize the detector design. In this context has the WADAPT (Wireless Allowing Data and Power Transmission) consortium been formed to identify the specific needs of different projects that might benefit from wireless readout techniques. The millimeter-wave band (mmw) is defined where the wavelength varies from ten millimeters (30 GHz) down to 1 millimeter (300 GHz). In this consortium we will concentrate on data transfer communication in the 60 GHz band (57 GHz - 66 GHz). This license free 9 GHz band is very attractive in order to achieve a high data rate transfer. In addition it provides a small form factor, material reduction, high material penetration loss, narrow beam width and high path loss. These features, and due to the operation in a very well controlled environment with line-of-sight operation, makes the 60 GHz band optimal for short range operation as in a detector environment.
This talk present current developments of the 60 GHz transceiver chip for HEP applications. Studies of antenna and data transmission will also be shown.
An International collaboration for an R&D on wireless readout is now sent to CERN, and is now under evaluation.Speaker: Mr Hans Kristian Soltveit (University of Heidelberg) -
15:45
CosmoHub and SciPIC: Massive cosmological data analysis, distribution and generation using a Big Data platform 15m
Galaxy surveys require support from massive datasets in order to achieve precision estimations of cosmological parameters. The CosmoHub platform and SciPIC pipeline have been developed at the Port d'Informació Científica (PIC) to provide this support, achieving nearly interactive performance in the processing of multi-Terabyte datasets. Cosmology projects currently supported include ESA's Euclid space mission, the Dark Energy Survey (DES), the Physics of the Accelerating Universe (PAU) survey and the Marenostrum Institut de Ciències de l'Espai Simulations (MICE). Support for additional projects can be added as needed. CosmoHub (https://cosmohub.pic.es) is a web portal to perform interactive analysis of massive cosmological data. It enables users to interactively explore and distribute data without any SQL knowledge. It is built on top of Apache Hive, part of the Apache Hadoop ecosystem, which facilitates reading, writing, and managing large datasets. More than two billion objects, from public and private data, as well as observed and simulated data, are available. Over 400 users have produced over the last three years about 1500 custom catalogs occupying 2TB in compressed format. All those datasets can be interactively explored using an integrated visualization tool. The current implementation allows an interactive analysis of billion object datasets to complete in less than 25 seconds. The SciPIC scientific pipeline has been developed to efficiently generate mock galaxy catalogs using as input a dark matter halo population. It runs on top of the Hadoop platform using Apache Spark, which is an open-source cluster-computing framework. The pipeline is currently being calibrated to populate the full sky Flagship dark matter halo catalog produced by the University of Zürich, which containins about 44 billion dark matter haloes in a box size of 3.78 Gpc/h. The resulting mock galaxy catalog is directly saved in the CosmoHub platform.
Speaker: Dr Jorge Carretero (IFAE-PIC) -
16:00
Coffee break 30m
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16:30
Reconstruction and identification of hadronic objects with CMS 15m
Performance & validation of new developments of reconstruction algorithms of several hadronic objects using data collected by the CMS experiment in 2016 at a centre-of-mass energy of 13 TeV are presented.
The jet energy and missing transverse momentum scales are measured in MC and data. A likelihood based discriminator is used to distinguish jets originating from quarks and gluons, and multivariate techniques are employed to distinguish pile up jets. Algorithms are used to identify large radius jets reconstructed from the decay products of highly Lorentz boosted W bosons and top quarks, and the efficiency and background rejection rates of these algorithms are measured.
Recent cutting edge developments of heavy flavor identification algorithms are discussed, which exploit the power of deep neural networks. The expected performance of these algorithms in 2017, when CMS will start to collect data with an upgraded pixel detector, will be also shown. The CMS Collaboration is pushing the heavy flavor identification beyond the traditional identification of b jets. The talk will also discuss the implementation of algorithms specialized to the boosted topologies, and the identification of jets originated from charm quarks.
Tau leptons decaying via hadronic modes are reconstructed and identified using Hadron plus Strips (HPS) algorithm. The electromagnetic strip reconstruction used by this algorithm is improved to better model signal of pi0 from tau decays by allowing the strip size to dynamically change based on the strip energy. This improves the energy response and removes the tau footprint from isolation area. In addition to this, improvement to discriminators combining isolation and tau life time variables, and anti-electron in multivariate analysis technique are also developed.Speaker: Mauro Verzetti (University of Rochester (US)) -
16:45
Algorithmic improvements and calibration measurements for flavour tagging at the ATLAS experiment 15m
The identification of jets containing b-hadrons is key to many physics analyses at the LHC, including measurements
involving Higgs bosons or top quarks, and searches for physics beyond the Standard Model. In this contribution, the
most recent enhancements in the capability of ATLAS to separate b-jets from jets stemming from lighter quarks, and
the latest measurements to calibrate the b-tagging efficiency and light/charm mistag rates, will be presented.Speaker: Marco Battaglia (University of California,Santa Cruz (US)) -
17:00
Real-time analysis from the trigger candidates and novel calibration strategy at the LHCb experiment 15m
The availability of computing resources is a limiting factor in data collection at the LHCb experiment, due to the high production rate of beauty and charm hadrons. For Run 2, LHCb has implemented a novel approach to make optimal use of these resources: The output of the first software trigger stage is buffered to disk and the second stage is executed asynchronously, using 100% of the available trigger farm even between LHC fills. As an integral part of the new strategy, the detector is aligned and calibrated, and the data are fully reconstructed, in real-time, permitting offline-quality signal selections. Without the need to reconstruct offline, it is possible to save only the information needed for analysis directly from the trigger. This concept, called the “LHCb Turbo stream”, maximises the signal rate saved to disk. The analysis of the data collected also required appropriate calibration samples to determine the tracking and PID performance. A novel strategy has been introduced in Run 2, where the selection of calibration samples is implemented as a Turbo stream. A further processing of the data is required in order to provide background subtracted samples for the determination of performance, which is achieved through a centralised production that makes highly efficient use of computing resources. These data are also used in the development of new algorithms to evaluate the detector performance in LHC upgrade scenarios. The aim of this talk is twofold. It will cover the major steps of the implementation, and detail the use of the calibration samples to determine the PID performance and tracking efficiency. It will also present how LHCb dynamically adapts the output rate of the first trigger stage to the LHC efficiency, and how the Turbo paradigm was extended in 2017 to dynamically persist any information required for analysis. This can range from only the signal candidate object to the complete event, with user-selectable granularity.
Speaker: Giulio Gazzoni (Univ. Blaise Pascal Clermont-Fe. II (FR)) -
17:15
The ProtoDUNE-SP Prompt Processing System 15m
The Deep Underground Neutrino Experiment (DUNE) will employ a uniquely large Liquid Argon Time Projection chamber as the main component of its Far Detector. It will include four 10kt modules which will include single and dual-phase Liquid Argon technologies.
In order to validate its design, an experimental program been initiated which includes a beam test of large-scale DUNE prototypes at CERN in 2018.
The volume of data to be collected by the protoDUNE single-phase detector will amount to a few petabytes and the sustained rate of data sent to mass storage will be in the range of a few hundred MB per second. In addition to careful design of the Data Acquisition, Online Monitoring and Data Handling systems, the protoDUNE experiment requires substantial Data Quality Monitoring capabilities in order to ascertain the condition of the detector and its various subsystems. To this end, a Prompt Processing system has been designed which is complementary to Online Monitoring and is characterized by lower bandwidth, substantial CPU resources and end-to-end latency on the scale of a few minutes. We present the design of the ProtoDUNE Prompt Processing system, the current status of its development and testing and issues related to its interfaces and deployment.Speaker: Maxim Potekhin (Brookhaven National Laboratory (US)) -
17:30
The DUNE Far and Near Detector 15m
We present the plan for the Deep Underground Neutrino Experiment (DUNE) photon detector system and recent research and development work that has contributed to the design. DUNE will be composed of multiple liquid argon time projection chambers (TPCs). In order to determine the full 3D position of a particle in the detector its initial time must be known accurately. This initial time can be determined using the scintillation light, which is produced simultaneously with the charge signal the TPC collects but travels much faster. The DUNE photon detector system is designed to increase the amount of active area sensitive to light while not reducing the available fiducial volume in the liquid argon.
Speaker: Nicola McConkey (Sheffield University) -
17:45
Challenges of front-end and triggering electronics for High Granularity Calorimetry 15m
A High Granularity Calorimeter (HGCAL) is presently being designed by the CMS collaboration to replace the existing end cap detectors. The HGCAL must be able to cope with the very high collision rates, imposing the development of novel filtering and triggering strategies, as well as with the harsh radiation environment of the High Luminosity LHC. In this talk we present an overview of the full electronics architecture and the performance of prototype components and algorithms. The requirements for the front-end electronics are extremely challenging, including high dynamic range (0-10 pC), low noise (~2000e-) and low power consumption (~10mW/channel), as well as the need to select and transmit trigger information with high granularity. Exploiting the intrinsic precision-timing capabilities of silicon sensors also requires careful design of the front-end electronics and the clock distribution. A new generation of highly performant ”SKIROC” Front-End chips in 130 nm CMOS technology, including both ADC and TDC blocks and a Time-over-threshold architecture, is being developed to meet the requirements of the HGCAL. The HGCAL incorporates around six million readout channels and so presents a significant challenge in terms of data manipulation and processing for the trigger; the trigger data volumes will be an order of magnitude above those currently handled by CMS. In addition, the high luminosity will result in an average of 140 interactions per bunch crossing that give a huge background rate in the forward region, and these will need to be efficiently rejected by the trigger algorithms. Furthermore, reconstruction of the particle clusters to be used for particle flow in events with high occupancy is a complex computational problem for the trigger. The status of the front-end and trigger architectures and designs, as well as the concepts for the algorithms needed in order to tackle these major issues, will be presented.
Speakers: Ivica Puljak (Technical University of Split FESB), Ivica Puljak (University of Split. Fac.of Elect. Eng., Mech. Eng. and Nav.Arc) -
18:00
Machine and deep learning techniques in heavy-ion collisions with ALICE 15m
Over the last years, machine learning tools have been successfully applied to a wealth of problems in high-energy physics.
A typical example is the classification of physics objects.
Supervised machine learning methods allow for significant improvements in classification problems by taking into account observable correlations and by learning the optimum selection from examples, e.g. from Monte Carlo simulations.
Even more promising is the usage of deep learning techniques. Methods like deep convolutional networks might be able to catch features from low-level parameters which are not exploited by default cut-based methods.These ideas could be particularly beneficial for measurements in heavy-ion collisions, because of the very large multiplicities. Indeed, machine learning methods potentially
perform much better in systems with a large number of degrees of freedom compared to cut-based methods. Moreover, many key heavy-ion observables are most interesting at low transverse momentum where the underlying event is dominant and the signal-to-noise ratio is quite low.In this talk, recent developments of machine and deep learning applications in heavy-ion collisions with ALICE will be presented, with focus on a deep learning based b-jet tagging approach and the measurement of low-mass dielectrons. While the b-jet tagger is based on a mixture of shallow fully-connected and deep convolutional networks, the low-mass dielectron measurement uses gradient boosting and shallow neural networks. Both methods are very promising compared to default cut-based methods.
Speaker: Rudiger Haake (CERN) -
18:15
The new CGEM inner tracker and the custom TIGER ASIC for the BESIII experiment 15m
A new detector exploiting the technology of Cylindrical Gas Electron Multipliers (CGEM) has been proposed to replace the innermost tracker chamber of BESIII (Beijing Electron Spectrometer) experiment, which is suffering from aging due to the high luminosity of Beijing Electron Positron Collider (BEPCII).
The CGEM Inner Tracker will deploy several new features w.r.t. other state-of-art GEM detectors. The µTPC and analog readout, using charge centroid method, will allow for a 130 µm spatial resolution in a 1 T magnetic field, keeping the number of channels to a manageable number (about ten thousand while the digital readout would require 25000 channels).
The channels are readout by TIGER (Torino Integrated GEM Electronics for Readout), a custom 64-channel mixed-mode ASIC, providing time and charge measurements with a fully-digital output. The charge measurement is obtained either from the time-over-threshold or the 10-bit digitization of the peak amplitude of the signal. The time of the event is measured by quad-buffered, low-power TDCs, based on analog interpolation techniques. For µTPC readout, a time resolution of better than 5 ns is needed. A maximum event rate of 60 kHz (with a 4× safety factor) is foreseen per channel.
In this presentation, an overview of TIGER characterization will be covered with a particular focus on measurements to assess the functionality of the silicon and on first tests with the full-scale detector.Speaker: S. Marcello (INFN-Torino, University of Torino, Italy)
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Dark matter Room Volpi (Palazzo del Casinò)
Room Volpi
Palazzo del Casinò
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14:30
Dark matter searches at colliders 30m
A general overview of the landscape for WIMP and non-WIMP DM at colliders is presented, highlighting new results but also showcasing the directions of the search program of the two general purpose experiments ATLAS and CMS towards the full Run-2 dataset.
Speakers: Shin-Shan Yu, SHIN-SHAN YU (FERMILAB), Shin-Shan Yu (National Central University (TW)) -
15:00
Searches for dark matter in hadronic final states 15m
Searches in CMS for dark matter in final states with invisible particles recoiling against hadronic final states are presented. Various topologies and kinematic variables are explored, as well as jet substructure as a means of tagging heavy bosons. The focus of the talk is the recent results obtained using data collected in 2016 run of the LHC.
Speaker: Deborah Pinna -
15:15
Dark Matter searches with the ATLAS Detector 15m
The presence of a non-baryonic dark matter component in the Universe is inferred from the observation of its gravitational interaction. If dark matter interacts weakly with the Standard Model it would be produced at the LHC, escaping the detector and leaving a large missing transverse momentum as their signature. The ATLAS detector has developed a broad and systematic search program for dark matter production in LHC collisions. The results of these searches on the first 13 TeV data, their interpretation, and the design and possible evolution of the search program will be presented.
Speaker: Dr Valerio Ippolito (Harvard University (US)) -
15:30
Search for long-lived scalar particles in B decays at LHCb 15m
The presence of dark matter is known from cosmological observations yet it has so far escaped direct detection. As a consequence there has been renewed interet in hidden-sector models that predict new particles that are singlets with respect to the Standard Model (SM) gauge bosons and thus interact very weakly with the Standard Model particles.
The LHCb experiment allows to search for these dark-sector particles in the GeV mass range using rare B meson decays, thanks to its low trigger thresholds, and excellent tracking and particle identification performance. Recent results from LHCb on searches for dark-sector particles are presented.Speaker: Andrea Mauri (Zurich University) -
15:45
Search for dark sector particles at Belle 15m
The dark photon, $A′$, the dark Higgs boson, $h′$, and the dark baryon, $B'$, are hypothetical constituents featured in a number of recently proposed Dark Sector Models. Dark Sector particles can be produced in the dark Higgs-strahlung and radiative processes, and in neutral $D$-meson decays channels. We will present results for the search of dark sector particles with prompt and displaced vertex decay topologies, when applicable, obtained using $1 {\rm ab}^{-1}$ of data collected by the Belle detector. We also report the results of a search for dark matter in radiative $\Upsilon(1S)$ decays.
Speaker: Youngjoon Kwon (Yonsei University) -
16:00
Coffee break 30m
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16:30
Dark Sector Physics with Belle II 15m
The next-generation B-factory experiment Belle II at the upgraded KEKB accelerator, SuperKEKB, will start physics data taking in 2018. It is an asymmetric e+e- collider that will operate with 40x the instantaneous luminosity of KEKB/Belle and aims to collect 50 times more data in total.
Belle II offers the possibility to search for a large variety of dark sector particles in the GeV mass range complementary to LHC and dedicated low energy experiments. These searches will profit both from the very large dataset that will be acquired by the Belle II experiment, and from specifically designed triggers for the early running of Belle II. This talk will review planned dark sector searches with a focus on the discovery potential of the first data.
Speaker: Torben Ferber (University Of British Columbia) -
16:45
Single Top and Dark Matter: Two is not always better than one 15m
To date, only two modes of production at hadron colliders of dark matter through new scalar or pseudoscalar mediators have been considered in the existing literature: pairs of dark matter particles produced through top quark loops with an associated hadronic jet in the event (monojet), and production of dark matter with pairs of heavy flavoured top or bottom quarks.
We present a third, previously overlooked channel, which consists of dark matter production in association with a single top quark.In spite of a generally lower production cross section at LHC when compared to the associated top-pair channel, non-flavour violating single top quark processes are kinematically favored and can greatly increase the sensitivity to these models. We will show that including dark matter production in association with a single top quark through scalar or pseudoscalar mediators significantly improves the current searches. In particular, the exclusion limit with the available data set by the LHC searches for dark matter and heavy flavours can be substantially improved from 30% to up to a factor 2 depending on the mass assumed for the mediator particle.
We expect that, with a dedicated event selection, the single top and dark matter production mode would demonstrate its full potential, and become the leading channel in Run II and future LHC searches.Speaker: Alberto Zucchetta (Universitaet Zuerich (CH)) -
17:00
Direct detection of neutralino dark matter with DM@NLO 15m
We present a full NLO QCD calculation of neutralino scattering on protons or neutrons in the Minimal Supersymmetric Standard Model. We match the results of the NLO QCD calculation to the scalar and axial-vector operators in the effective field theory approach. These govern the spin-independent and spin-dependent detection rates, respectively. The calculations have been performed for general bino, wino and higgsino decompositions of neutralino dark matter and required a novel tensor reduction method of loop integrals with vanishing relative velocities and Gram determinants. Numerically, the NLO QCD effects are shown to be of at least of similar size and sometimes larger than the currently estimated nuclear uncertainties. We also demonstrate the interplay of the direct detection rate with the relic density when consistently analyzed with the program DM@NLO.
Speaker: Michael Klasen -
17:15
Dark matter and LHC: complementaries and limitations 15m
It is well known that dark matter density measurements, indirect and direct detection experiments, importantly complement the LHC in setting strong constraints on new physics scenarios. Yet, dark matter searches are subject to limitations which need to be considered for realistic analyses. For illustration, we explore the parameter space of the phenomenological MSSM and discuss the interplay of the constraints from dark matter searches and the LHC, and analyse the impact of the astrophysical uncertainties in some detail.
Speaker: Glenn Robbins (Centre de recherche astrophysique de Lyon (FR)) -
17:30
Global fits of the scalar singlet model using GAMBIT 15m
I will present the latest results for global fits to the Higgs portal scalar singlet extended standard model using complementary probes of dark matter. In doing so I will introduce the new global and modular beyond the standard model inference tool (GAMBIT), which we use to achieve these results in a statistically consistent and modular way.
Speaker: Mr James McKay (Imperial College London) -
17:45
Search for physics beyond the SM in meson decays with WASA detector. 15m
The indirect searches for dark matter particles are a very hot topic of today's physics and astrophysics. The energy-mass content of the Universe is one of the biggest riddles of modern science. The Standard Model describes the physics of only a small fraction of the Universe. Although only gravitational interaction of the dark matter with normal matter was observed up to now, a lot of effort is put by the scientific community into searches for some new interaction between dark and usual matter. This new force would be carried by a new boson and the latter could be seen in the decays of mesons. Most of the scientific research for the effects of dark matter focuses on very high energy physics, still the existence of such effects at lower energy scales is not excluded. Through the analysis of the rare decays of light mesons (eta, neutral pion) WASA collaboration searches for a dark matter signal which cannot be described in the frame of the Standard Model. This effect could be explained by a coupling between a dark boson and Standard Model particles (leptons, photons and/or quarks). The WASA detector is perfectly suited to study leptonic decays for it has the capability to detect both neutral and charged particles and particle identification capacity. The analysis of channels such as $\eta\to e^{+}e^{-}\gamma$, $\eta\to e^{+}e^{-}$ or $\pi^{0}\to e^{+}e^{-}\gamma$ will be presented. The data sample with $\eta$ meson production was collected in proton proton collisions at 1.4 GeV kinetic energy.
Speaker: Damian Pszczel (Uppsala University) -
18:00
KLOE/KLOE-2 results and perspectives on dark force search 15m
During the last years several Dark Sector Models have been proposed in order to address striking astrophysical observations which fail standard intepretations.
In the minimal case a new vector particle, the so called dark photon (U or A' boson), is introduced, with small coupling with Standard Model particles. Also, the existence of a dark Higgs boson h' is postulated, in analogy with the Standard Model, to give mass to the dark photon through the Spontaneous Symmetry Breaking mechanism.The experiment KLOE, which collected 2.5 fb-1 of integrated luminosity at the Dafne e+e- collider in Frascati, searched for the existence of the dark photon in a quite complete way, investigating three different processes and six different final states:
- in dalitz decays of the Phi meson Phi-> eta U, with U->e+e- and eta-> pi+pi-pi0 and p0p0p0
- in e+e- -> U gamma events, with U decaying to electron, muon and pion pairs
- in the dark Higgsstrahlung process, e+e- -> Uh', U-> mu+mu-, h' invisible.
Tight limits on the model parameters have been set at 90%CL.
A new beam crossing scheme, allowing
for a reduced beam size and increased luminosity, is now operating at DAFNE.
The upgraded detector, named KLOE-2, has already collected 3.5 fb-1 in these
new operating conditions.Further improvements are expected in terms of sensitivity and discovery potential with KLOE-2, both because of the larger available integrated luminosity and the presence of a new tracking detector in the interaction region, with better momentum and vertex position measurement resolutions.
A single photon trigger is now in operation and will allow the search of the dark photon through its invisible decays in light dark matter particles.Speaker: Giuseppe Mandaglio (INFN - National Institute for Nuclear Physics) -
18:15
Search for the gauge boson of a secluded sector with the PADME experiment at LNF 15m
Massive photon-like particles are predicted in many extensions of the Standard Model with a hidden sector where dark matter is secluded. They are vector bosons mediating the interaction between dark matter particles and can be produced in scattering of ordinary particles through a faint mixing to the photon. Most of the present experimental constraints on this “dark photon” (A’) rely on the hypothesis of dominant decays to lepton pairs. The PADME experiment will search for the e+e−→γA’ process in a positron-on-target experiment, assuming a decay of the A’ into invisible particles of the hidden sector. The positron beam of the DAΦNE Beam-Test Facility, at Laboratori Nazionali di Frascati of INFN, will be used. A fine-grained, high-resolution calorimeter will measure the momentum of the photon in events with no other activity in the detector, thus allowing to measure the A’ mass as the missing mass in the final state.
In about one year of data taking, a sensitivity on the interaction strength (ε parameter) down to 0.001 is achievable in the mass region M(A’)<23.7 MeV.
The experiment is currently under construction and it is planned to take data in 2018. The status of PADME and its physics potential will be reviewed.
Speaker: Paola Gianotti (INFN e Laboratori Nazionali di Frascati (IT))
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Flavour and symmetries Room Mosaici-2 (Palazzo del Casinò)
Room Mosaici-2
Palazzo del Casinò
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14:30
The invariant and helicity amplitudes in the transitions $\Lambda_b\to\Lambda^\ast(\frac12^\pm,\frac32^\pm)+J/\psi$. 15m
I present results for the invariant and helicity amplitudes in the transitions
$\Lambda_b~\to~\Lambda^\ast(J^P)~+~J/\psi$ where
$\Lambda^\ast(J^P)$ are $sud$-resonances with
$J^P=\frac12^{\pm},\frac32^{\pm}$. The calculations are performed in
the framework of our covariant confined quark model.
We find that the values
of the helicity amplitudes for the $\Lambda^\ast(1520,\,\frac32^-)$
and $\Lambda^\ast(1890,\,\frac32^+)$
are suppressed compared with those for the
ground state $\Lambda(1116,\,\frac12^+)$ and $\Lambda^\ast(1405,\,\frac12^-)$.
This analysis is important for the identification of
the charmed pentaquark $P_c^+$ since the cascade decay
$\Lambda_b~\to~\Lambda^\ast(\frac32^\pm)(~\to~pK^-)~+~J/\psi$.
involves the same final states as the decay
$\Lambda_b^0~\to~P_c^+(~\to~p~K^-)~+~J/\psi $.I also discuss polarization effects in the cascade decay
$\Lambda_b~\to~\Lambda(1116)(\to~p\pi^-)~+~J/\psi(\to~\ell^+\ell^-)$.
This analysis was published in [1].[1] T.~Gutsche, M.~A.~Ivanov, J.~G.~K\"orner, V.~E.~Lyubovitskij
and P.~Santorelli,
Phys.\ Rev.\ D {\bf 88}, no. 11, 114018 (2013)Speakers: Prof. Mikhail Ivanov (Joint Institute for Nuclear Research), Mikhail Ivanov, Mikhail Ivanov (Ecole Polytechnique Federale de Lausanne (CH)), Mikhail Ivanov (Moscow State University) -
14:45
Theory overview of the tree-level b-decays 30m
I review theoretical progress in the study of semileptonic tree-level B decays and its interplay with recent experimental results. In particular, I focus on two anomalies: the ratios $R(D)$, $R(D^{*})$:
$R(D^{(*)})=\frac{BR(B-> D^{(*)} \tau \bar \nu_\tau)}{BR(B-> D^{(*)} \ell \bar \nu_\ell)}$
and the inclusive vs exclusive determination of $|V_{cb}|$.
I review several explanations for such anomalies and discuss further tests to clarify their origin.Speakers: Fulvia De Fazio (INFN Bari), Fulvia De Fazio (Universita e INFN, Bari (IT)) -
15:15
LHC results on tree-level beauty decays 30m
LHC results on tree-level beauty decays
Tree-level beauty decays present crucial ingredients in the search for physics beyond the SM through quark flavour changing transitions.
This contribution covers recent LHC results in charged-current semileptonic decays and beauty decays to both charmed and charmless fully hadronic final states.
The semileptonic decays must be studied to determine the parameters |Vub| and |Vcb| in order to over-constrain the Unitary Triangle.
First studies with semileptonic beauty baryons, which are uniquely accessible at hadron colliders, are presented.
Semitaunonic decays provide an opportunity to test for physics that couples differently among the leptonic families, and recent results in this area are presented.
Tree level decays to hadronic final states provide complementary constraints on the parameters of the Unitarity Triangle, in particular the internal angle gamma, which is currently the least precisely determined.
Several recent results on beauty decays to charmed and charmless final states are presented, including their combined impact on the determination of the angle gamma.Speaker: Mika Anton Vesterinen (Ruprecht-Karls-Universitaet Heidelberg (DE)) -
15:45
New results on rare B decays with leptons from Belle 30m
Rare B decays with leptons in the final state are powerful probes to search for physics beyond the Standard Model (SM) as they can be calculated in the SM with high precision. We report recent results on rare B decays with leptons from the Belle experiment at the KEKB $e^+ e^-$ collider. The $B \to D^* \tau^+ \nu$ mode is sensitive to New Physics effects such as a charged Higgs or leptoquark current, while the world average of the branching ratio shows a discrepancy from the SM. Recently, Belle has performed a measurement of this mode using $\tau^+$ decays to hadronic final states, which is essentially independent of previous measurements from Belle. With this method, the $\tau$ lepton polarization in $B \to D^* \tau^+ \nu$ has been measured for the first time. In addition, we study the $D^*$ polarization in $B \to D^* \tau^+ \nu$ by analyzing the $D^*$ helicity angle distributions. Exploiting the unique features of $e^+ e^-$ B-factories, Belle can also study inclusive $B \to X_c \tau^+ \nu$ decays. Recent results on purely leptonic decay, $B \to \mu^+ \nu$ will also be discussed. The analyses are based on the full data set of Belle containing 772 million $B\bar{B}$ pairs.
Speaker: Saskia Falke (Centre National de la Recherche Scientifique (FR)) -
16:15
Coffee break 30m
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Recent results from LHCb on semileptonic decays of b-hadrons 15m
Due to their large branching fractions and good theoretical uncertainties, semileptonic b-hadron decays are excellent tools to study the CKM matrix and b-hadron properties such as lifetimes. The LHCb experiment has a very good potential for studies of semi-leptonic decays of b-hadrons, due to its excellent muon identification capabilities and very good reconstruction of decay vertices. In this contribution, recent results on semileptonic decays of b-hadrons at LHCb are presented.
Speaker: Concezio Bozzi (CERN and INFN Ferrara) -
17:00
The role of theory input for exclusive Vcb determinations 15m
We present recent results on the extraction of Vcb from data on B->D^* l nu decays. Using two different parameterizations of form factors, we show how theory input from Heavy Quark Effective Theory or Light Cone Sum Rules affect the value of Vcb. The results show that the inconsistency of Vcb extractions in exclusive and inclusive decays needs a reappraisal.
Speaker: Stefan Schacht (INFN, Sezione di Torino and Universita di Torino) -
17:15
Time-dependent measurements of the CKM angle gamma at LHCb 15m
The CKM angle gamma is the least well-known angle of the unitarity triangle, and the only one easily accessible at tree level. Important constraints on gamma are obtained from time dependent analysis of flavour-tagged Bs -> Ds K decays, and the latest results using the full LHCb Run 1 dataset are presented here. The ultimate goal of degree level precision for gamma requires exploitation of all possible channels and techniques, and the results of related time-dependent analyses of B meson decays with gamma sensitivity, B->Dpi and B->Ds*K, will be presented.
Speaker: Donal Hill (University of Oxford (GB)) -
17:30
Sensitivity to scalar contributions in b to c (u) tau nu decays 15m
I present results of an analysis of scalar contributions in b→cτν transitions including the latest measurements of R(D(∗)), the q2 differential distributions in B→D(∗)τν, the τ polarization asymmetry for B→D∗τν, and the bound derived from the total width of the Bc meson. Scalar contributions with the simultaneous presence of both left- and right-handed couplings to quarks can explain the available data, specifically R(D(∗)) together with the measured differential distributions. However, the constraints from the total Bc width present a slight tension with the current data on B→D∗τν in this scenario, preferring smaller values for R(D∗). I discuss possibilities to disentangle scalar new physics from other new-physics scenarios like the presence of only a left-handed vector current, via additional observables in B→D(∗)τν decays or additional decay modes like the baryonic Λb→Λcτν and the inclusive B→Xcτν decays. We also analyze scalar contributions in b→uτν transitions, including the latest measurements of B→τν, providing predictions for Λb→pτν and B→πτν decays. The potential complementarity between the b→u and b→c sectors is finally investigated once assumptions about the flavour structure of the underlying theory are made.
Speaker: Alejandro Celis (Ludwig Maximilian University) -
17:45
Charmless B decays at LHCb 15m
Charmless b-hadron decays are CKM suppressed in the Standard Model, which brings the tree amplitudes to levels comparable with corresponding loop amplitudes. Hence, new particles not foreseen in the SM that appear in the loops may alter observables of these decays. We present the most recent measurements of branching ratios and CP asymmetries in charmless b-hadron decays to two- and multi-body final states. Measurements of polarisation fractions and triple-product asymmetries for B->VV decays, where V indicates a vector meson, are also presented.
Speaker: Eduardo Rodrigues (University of Cincinnati (US)) -
18:00
Possible origin(s) of RD(*) flavor anomalies 15m
Three key issues pertaining to the semi-leptonic RD(*) anomalies will be addressed here:
1) How robust are the SM predictions?
2) What are the model-independent collider signature of these anomalies?
3) What are some of the simplest BSM explanations for these?
In answer to 1) latest information from on and off the lattice will be critically
examined to question, in particular the reliability of the stated theory error.
Reg 2) It will be shown that the semi-leptonic anomalies rigorously imply unavoidable collider signatures that the LHC experimental community should ASAP vigorously pursue to confirm or refute these anomalies. Lastly, but nevertheless of considerable importance, reg 3), is the issue of what interesting, and theoretically well motivated, underlying extensions of the SM are there that could be responsible for these anomalies assuming they withstand further scrutiny and the test of time.This talk is based in significant part on work done and in progress with Wolfgang Altmannshofer and Bhupal Dev.
Speaker: Amarjit Soni (Brookhaven National Lab) -
18:15
Measurement of CKM parameters at Belle II 15m
The Belle II experiment is a substantial upgrade of the Belle detector; it will operate at the SuperKEKB energy-asymmetric e+e− collider. The detector is in its final phase of construction and the accelerator has successfully completed the first phase of commissioning. The design luminosity is 8×1035cm−2s−1, and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than the Belle experiment. We report our prospects for measuring the CKM angle gamma and observables in semileptonic B meson decays linked to the matrix elements Vcb and Vub.
The CKM angle gamma is the least well known of the angles of the unitarity triangle and the only one that is accessible with tree-level decays in a theoretically clean way. The key method to measure gamma is through the interference between B^+ to D^0 K^+ and B^+ to \overline{D}^0 K^+ decays which occur if the final state of the charm-meson decay is accessible to both the D^0 and \overline{D}^0 mesons. To achieve the best sensitivity, a large variety of D and B decay modes is required; the Belle II experiment has the advantage that almost all final states can be reconstructed, including those with photons.
The measurements of rates and other observables in CKM favoured or suppressed semileptonic B meson decays to light leptons (electron and muon) and to the tau lepton. provide a gateway to fundamental parameters of the Standard Model, such as Cabibbo-Kobayashi-Maskawa matrix elements Vcb and Vub and are sensible to lepton flavour universality violation from physics beyond the Standard Model.
Speaker: Ilya Komarov (Ecole Polytechnique Federale de Lausanne (CH)) -
18:30
Nonperturbative determination of form factors for semileptonic Bs meson decays 15m
Investigating the phenomenology of semileptonic $B_s$ meson decays allows to further constrain the Standard Model and explore new, independent channels to determine important parameters, like the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$. Given different systematics of $B_s$ decays w.r.t. $B$ decays, this may help to shed light on the long-standing discrepancy between inclusive and exclusive determinations of CKM matrix elements, on recently reported anomalies like in ratios of branching fractions, or on rare, GIM suppressed decays.
Here we report on our lattice calculation based on the set of 2+1 flavor domain-wall Iwasaki gauge field configurations generated by the RBC-UKQCD collaboration using domain-wall light, strange, and charm quarks, and bottom quarks simulated with the relativistic heavy quark action. We present new results for semileptonic form factors for $B_s \to D_s \ell \nu$ and $B_s \to K \ell \nu$ as well as for $B_s \to \phi \ell^+ \ell^-$ and will give an outlook on determining the ratios $R(D_s)$ and $R(D_s^*)$ as well as on form factors for $B_s\to K^{(*)} \ell^+ \ell^-$ decays.
Speaker: Oliver Witzel (University of Edinburgh)
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Higgs and new physics: Higgs Room Welles (Palazzo del Casinò)
Room Welles
Palazzo del Casinò
Convener: Giuseppe Degrassi (Universita e INFN, Roma Tre (IT))-
14:30
Charged Higgs production with a W boson or a top quark 15m
I present theoretical results for charged Higgs production in association with a W boson or a top quark at the LHC. I calculate higher-order threshold corrections and show that they are very significant. I present detailed results for total cross sections as well as transverse-momentum and rapidity distributions of the Higgs boson for various LHC energies.
Speaker: Nikolaos Kidonakis (Kennesaw State University) -
14:45
Charged Higgs boson searches with the ATLAS detector 15m
Several theories beyond the Standard Model, like the 2HDM, predict the existence of high mass charged Higgs particles. Such charged Higgs, produced in association with a top quark or in VBF, are searched for in several decay channels, using about 36 fb-1 of p-p collisions at 13 TeV.
Speaker: Elin Bergeaas Kuutmann (Uppsala University (SE)) -
15:00
Standard Model Extended by a Heavy Singlet: Linear vs. Nonlinear EFT 15m
I consider the Standard Model extended by a heavy scalar singlet and derive the low-energy effective theory resulting from integrating out the heavy state. This exercise in effective field theory serves to illustrate with a simple example the systematics of the linear and nonlinear electroweak effective Lagrangians and to clarify the relation between them. I discuss power-counting aspects and the transition between both effective theories on the basis of the model.
Speaker: Alejandro Celis (Ludwig Maximilian University) -
15:15
Search for a new spin-zero resonance in diboson channels at 13 TeV 15m
The talk aims to present the most recent results on heavy scalar search in diboson final states (WW,ZZ) combining different final states using full 2016 data collected by CMS detector.
Speaker: Alessio Magitteri (Universite Catholique de Louvain (UCL) (BE)) -
15:30
Search for high mass bosonic resonances with the ATLAS detector 15m
Several theories beyond the Standard Model, like the EWS or 2HDM models, predict the existence of high mass Higgs particles, which could decay into final states with Weak bosons. In this presentation the latest ATLAS results on these searches will be discussed, using about 36 fb-1 of p-p collisions at 13 TeV.
Speaker: Leonardo Carminati (Università degli Studi e INFN Milano (IT)) -
15:45
Flavour Physics meets Heavy Higgs Searches 15m
We point out that the stringent lower bounds on the masses of additional neutral and charged Higgs bosons crucially depend on the flavour structure of their Yukawa interactions. We show that these bounds can easily be evaded when flavour violation is allowed in the Higgs sector. As an illustration, we study the phenomenology of a two Higgs doublet model with a Yukawa texture arising from charging the right-handed top quarks under a new $U(1)_{PQ}$ symmetry, as arising from a variant axion model. We combine constraints from both low energy flavour physics measurements, LHC measurements of Higgs boson rates, and LHC searches for new Higgs bosons. We propose novel LHC searches for heavy Higgs bosons that could be performed in the coming years to unravel the existence of these new Higgs bosons.
Speaker: Ayan Paul (INFN, Sezione di Roma) -
16:00
Coffee break 30m
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Precision Calculations to Top- and Bottom-Yukawa Couplings within the SM and BSM 15m
In this talk we would like to report on our recent calculations of the mixed QCD-EW corrections to the top- and bottom Yukawa couplings within the Standard Model (SM) and beyond (THDM, MSSM). After a brief review of the SM calculations, we would like to concentrate on the comparison SM/BSM and on the non-decoupling behavior of these corrections that might open a new window to indirect searches for new physics.
Speakers: Dr Luminita Mihaila (ITP, University of Heidelberg), Luminita Mihaila (Uni Heidelberg) -
16:45
Two-Higgs-doublet model fits with HEPfit 15m
The Two-Higgs-doublet model (2HDM) is one of the most studied extensions of the Standard Model. But just as the other popular "New Physics" models, it gets more and more constrained by recent experimental progress, especially by the LHC data. For all four 2HDM types with a softly broken $Z_2$ symmetry, we present updated results of global analyses obtained with the open-source HEPfit code. We emphasize the impact of the LHC run II data. Furthermore, we discuss 2HDM's beyond the conventional $Z_2$ symmetric types and the status of their implementation in HEPfit.
Speaker: Otto Eberhardt (Istituto Nazionale di Fisica Nucleare) -
17:00
Tracks of resonances in electroweak effective Lagrangians 15m
Taking into account that LCH searches for New Physics are failing, the electroweak effective theory seems to be appropriate to deal with current energies. Tracks of new higher scales can be studied through next-to-leading corrections of the electroweak effective theory. Assuming strongly-coupled scenarios we have considered high-energy Lagrangians which incorporate explicitly new heavy fields. Then, and integrating out these heavy resonances, we study the pattern of low-energy constants among the light fields which are generated by the massive states. A generic non-linear realization of the electroweak symmetry breaking with a singlet Higgs is assumed. The importance of the high-energy behaviour of the underlying theory and different possible descriptions of massive spin-1 resonances are analysed.
Speaker: Ignasi Rosell (Universidad CEU Cardenal Herrera & IFIC, Valencia) -
17:15
Search for Higgs-like particle produced in association with $b$ quarks and measurement of $Z \to b\bar{b}$ cross section at CDF II 15m
We present a search for a Higgs-like particle $\phi$ decaying into $b\bar{b}$ produced in association with $b$ quarks in p$\bar{p}$ collisions. The event sample corresponds to 5.4 $\text{fb}^{-1}$ of integrated luminosity collected with the CDF II detector at the Tevatron collider using a single $b$ tagged jet trigger. We search for an enhancement in the mass of the two leading jets in event with at least three jets identified as coming from $b$ quarks. A data-driven procedure is applied to estimate the dijet mass spectrum of the non-resonant multijet background, which has been used to measure the production cross-section of the $Z$ decaying into $b\bar{b}$ in the same sample but with at least two b-jets. We set one of the most stringent upper limits on $\sigma(p\bar{p} \rightarrow \phi b) \times \mathcal{B}(\phi \rightarrow b\bar{b})$ in the $100-300~\text{GeV/c}^2$ mass range.
Speaker: Emanuele Michielin (Universita e INFN, Padova (IT)) -
17:30
Searching for massless Dark Photons at LHC via Higgs boson production 15m
Dark photons $\bar{γ}$ mediating long-range forces in a dark sector are predicted by various new physics scenarios, and are being intensively searched for in experiments. Thanks to the non-decoupling properties of the Higgs boson, BR values of Higgs decaying into a photon plus darkphoton $H \to\gamma \bar{\gamma}$ up to a few percent are possible for a massless dark photon, even for heavy dark-sector scenarios. The corresponding signature consists (for a Higgs boson at rest) of a striking monochromatic photon with energy $E_{\gamma}=m_H/2$, and similar amount of missing energy. We perform a model independent analysis at the LHC of both the gluon-fusion and VBF Higgs production mechanisms at 14 TeV, including parton-shower effects, and updating our previous parton-level analysis at 8 TeV in the gluon-fusion channel by a more realistic background modeling. We find that a 5σ sensitivity can be reached in the gluon-fusion channel for $BR(H\to \gamma\bar{\gamma})≃0.1\%$ with an integrated luminosity of L≃300${\rm fb}^{−1}$. The corresponding VBF reach is instead restricted to 1%. Such decay rates can be naturally obtained in dark-photon scenarios arising from unbroken $U(1)_F$ models explaining the origin and hierarchy of the Yukawa couplings, strongly motivating the search for this exotic Higgs decay at the LHC.
Speaker: Dr Barbara Mele (INFN) -
17:45
ATLAS Higgs and supersymmetry physics prospects at the high luminosity LHC 15m
The Higgs physics prospects at the high-luminosity LHC are presented, assuming an energy of sqrt(s) = 14 TeV and a data sample of 3000-4000 fb-1. In particular, the ultimate precision attainable on the couplings measurements of the 125 GeV Higgs boson with SM fermions and bosons is discussed, as well as perspectives on the search for the Standard Model di-Higgs production, which could lead to the measurement of the Higgs boson self-coupling.
Scenarios of SUSY sparticle production, among others, have been used as benchmark to drive the design of the component upgrades, and to evaluate the sensitivity of the upgraded accelerator and detector. This talk will also overview the expected sensitivity that the ATLAS experiment will have to SUSY sparticle production with 3000 fb-1 pf proton-proton collisions collected at a centre of mass energy of 14 TeV.Speaker: Nicola Venturi (CERN) -
18:00
Higgs measurements at the HL-LHC with CMS 15m
We present the performance of Higgs boson property measurements and BSM Higgs searches using the CMS detector in the High-Luminosity LHC conditions, with an integrated luminosity of up to 3000 fb-1. Projections of 13 TeV analyses and 14 TeV simulation studies are both shown.
Speaker: Adinda De Wit (Imperial College (GB)) -
18:15
Sensitivity to anomalous VVH couplings at the ILC 15m
The discovery of the 125 GeV Higgs boson, which was the last missing element of the standard model (SM), provided us the insight that the electroweak symmetry breaking is done by a Higgs condensate in the vacuum, namely the Higgs mechanism. However the SM does not give the dynamics explaining why and how that Higgs condensate is formed. On the other hand, the SM can not provide candidate particles for the dark matter, and can not explain the baryon number asymmetry in our universe, etc.. Therefore new physics beyond the SM is needed to answer all of those questions. Remarkably the effects of new physics will be inevitably imprinted in the properties of the Higgs boson, namely its couplings to other SM particles and its CP nature. At the future International Linear Collider (ILC), one of the most important goals is precise measurement those properties.
In this talk, we will focus on the measurement of the general Lorentz structure of couplings between Higgs and vector bosons (VVH, V=Z or W) at the ILC, based on an approach of the effective field theory. The sensitivities to both CP-even and CP-odd dimension-5 operators are evaluated by exploring various Higgs production and decay channels, in particular taking advantage of the sensitivities from differential cross sections measurements. The studies are performed based on full detector simulation of the International Large Detector (ILD), for ECM = 250 GeV and 500 GeV. Combined sensitivities are given for some realistic running scenarios of the ILC.
Speaker: Mr Tomohisa Ogawa (The Graduate University for Advanced Studies)
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Higgs and new physics: Supersymmetry Sala Perla (Palazzo del Casinò)
Sala Perla
Palazzo del Casinò
Convener: Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))-
14:30
SUSY scenarios according to EWSB 30m
The talk provides an overview of the status of SUSY breaking scenarios. The focus will be on the way the electroweak symmetry breaking is achieved and understood in different scenarios. Various aspects of naturalness and its implication will be discussed and compared.
Speaker: Radovan Dermisek -
15:00
Searches for supersymmetry via strong production in fully hadronic final states at CMS 15m
We report on searches for new physics in events with one or more jets and missing transverse energy. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
Speaker: Myriam Schoenenberger (Eidgenoessische Technische Hochschule Zuerich (CH)) -
15:15
Inclusive searches for squarks and gluinos in final states with no leptons with the ATLAS detector 15m
Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks and gluinos, including third generation squarks produced in the decay of gluinos. The searches involve final states containing jets, missing transverse momentum and no light leptons, taus or photons, and were performed with pp collisions at a centre-of-mass energy of 13 TeV.
Speaker: Otilia Anamaria Ducu (Universite de Montreal (CA)) -
15:30
Searches for supersymmetry via strong production in events with one or more leptons at CMS 15m
We report on searches for new physics in events with one or more charged leptons, jets and missing transverse momentum. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of pair production of supersymmetric partners of gluons or quarks.
Speaker: Christian Schomakers (Rheinisch-Westfaelische Tech. Hoch. (DE)) -
15:45
Inclusive searches for squarks and gluinos in final states with leptons with the ATLAS detector 15m
Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks and gluinos, including third generation squarks produced in the decay of gluinos. The searches involve final states containing jets, missing transverse momentum and one or more leptons, and were performed with pp collisions at a centre-of-mass energy of 13 TeV.
Speaker: Ximo Poveda Torres (CERN) -
16:00
Coffee break 30m
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16:30
Compressed SUSY searches with the Recursive Jigsaw Reconstruction 15m
The Recursive Jigsaw reconstruction technique provides a powerful way to tackle challenging SUSY final states with multiple missing particles. By altering the input "decay tree" we demonstrate a new approach to considering compressed SUSY signatures from a variety of different sources. The imposition of this decay tree provides a clear way to define which objects are associated with an ISR system and those which are candidate decay products of the SUSY system. From this choice a set of variables emerge, providing a method to distinguish compressed cases from the pernicious standard model backgrounds present.
We introduce this new approach, comparing it briefly to other methods used to probe this phase-space and demonstrate it's power through application to several compressed final states. We will further touch on the applicability of this same method to other physics processes where the use of conventional kinematic handles breaks down.
Speaker: Paul Douglas Jackson (University of Adelaide) -
16:45
Search for compressed SUSY scenarios with the ATLAS detector 15m
Scenarios where multiple SUSY states are nearly degenerate in mass produce soft decay products, and they represent an experimental challenge for ATLAS. This talk presents recent results of analyses explicitly targeting such “compressed” scenarios with a variety of experimental techniques. All results make use of proton-proton collisions collected at a centre of mass of 13 TeV with the ATLAS detector.
Speaker: Julien Maurer (IFIN-HH (RO)) -
17:00
Search for supersymmetry with compressed mass spectra or decays via Higgs bosons at CMS 15m
We report on searches for supersymmetry in scenarios where the mass differences between the lightest supersymmetric particles are small, or where their decay chains involve a Higgs boson. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
Speaker: Constantin Heidegger (Eidgenoessische Technische Hochschule Zuerich (CH)) -
17:15
Supersymmetry signals in Z' decays 15m
I discuss the feasibility to search for supersymmetry in the decays of heavy Z' bosons, predicted by GUT-inspired U(1)' models, by investigating final states with charged leptons and missing energy in pp collisions at the LHC. I also investigate decays into pairs of the lightest MSSM neutralinos, which are Dark Matter candidates, and update the exclusion limits on the Z' mass, accounting for the inclusion of BSM decay modes.
Speaker: Gennaro Corcella (INFN - LNF) -
17:30
Searches for production of third generation squarks at CMS 15m
We report on searches for supersymmetric partners of top and bottom quarks. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted under several assumptions for the decay of these particles.
Speaker: Indara Suarez (Univ. of California Santa Barbara (US)) -
17:45
Searches for direct pair production of third generation squarks in final states with no leptons with the ATLAS detector 15m
Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. Top or bottom squarks with masses less than or around one TeV can also give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents recent ATLAS results from searches for direct stop and sbottom pair production in final states containing no leptons, using the data collected during the LHC Run 2.
Speaker: Tommaso Lari (University and INFN, Milano) -
18:00
Searches for direct pair production of third generation squarks in final states with leptons with the ATLAS detector 15m
Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. Top or bottom squarks with masses less than or around one TeV can also give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents recent ATLAS results from searches for direct stop and sbottom pair production in final states with leptons, using the data collected during the LHC Run 2.
Speaker: Priscilla Pani (CERN) -
18:15
Soft gluon resummation for associated gluino-gaugino production at the LHC 15m
We present a threshold resummation calculation for the associated production of gluinos and gauginos at the LHC to the next-to-leading logarithmic accuracy. Analytical results are presented for the process-dependent soft anomalous dimension and the hard function. The resummed results are matched to a full next-to-leading order calculation, for which we have generalised the previously known results to the case of supersymmetric scenarios featuring non-universal squark masses. Numerically, the next-to-leading logarithmic contributions increase the total next-to-leading order cross section by 7 to 20% for central scale choices and gluino masses of 3 to 6 TeV, respectively, and reduce its scale dependence typically from up to ±12% to below ±3%.
Speaker: Michael Klasen
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Heavy ion physics Room Mangano (Palazzo del Casinò)
Room Mangano
Palazzo del Casinò
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Heavy flavour in high-energy nuclear collisions: results of transport calculations 30m
I will show how transport calculations, interfaced with a realistic hydrodynamic modeling of the background medium, allow one to provide predictions for momentum and angular distributions of heavy-flavour particles in high-energy nuclear collisions, to be compared eventually with experimental data (D/B-mesons and their decay products). The presence of a hot-deconfined medium (Quark-Gluon Plasma) in which the propagation (and final hadronization) of c and b quarks takes place leads to modifications of the final observables with respect to the proton-proton case. In my presentation I will focus on medium effects on transverse-momentum spectra (with low-pT particles pushed to moderate pT by the collective expansion of the medium and high-pT particles suffering energy-loss) and azimuthal distributions, the angular anisotropies (elliptic and triangular) of final-state particles reflecting the initial geometric asymmetry of the system produced in the collision. I will also show first results of full 3+1 simulations, dropping the approximation of longitudinal boost-invariance and allowing for the study of observables at forward rapidity.
Speaker: Dr Andrea Beraudo (INFN, sezione di Torino (IT)) -
15:00
Nuclear modification factor and elliptic flow of open heavy flavours in Pb--Pb collisions with ALICE at the LHC 15m
The LHC heavy-ion physics program aims at investigating the properties of the Quark-Gluon Plasma, QGP, formed in such collisions. Heavy quarks (charm and beauty) are regarded as efficient probes to study and characterize the QGP, as they are created on a very short time scale in initial hard processes and subsequently experience the entire system evolution interacting with the medium constituents.
The measurement of the nuclear modification factor, $R_{\rm AA}$, of heavy-flavour particles gives important information about the colour-charge and parton-mass dependence of energy loss as well as about possible modifications of heavy-quark hadronization in the medium. In addition, the heavy-flavour elliptic flow, $v_2$, provides insights on the degree of thermalization of heavy quarks in the deconfined medium and carries information on the path-length dependence of parton energy loss, in the low- and high-$p_{\rm T}$ regions respectively.
The heavy-flavour particles are measured in ALICE over a wide rapidity range, via D mesons and heavy-flavour hadron decay electrons at mid-rapidity ($|y|<0.8$), and heavy-flavour hadron decay muons at forward rapidity (2.5 < $y$ < 4).
The latest results on the $p_{\rm T}$-differential $R_{\rm AA}$ and $v_2$ of D mesons and heavy-flavour hadron decay leptons in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ and $2.76$ TeV performed with ALICE will be presented for different centrality classes and compared with theoretical model predictions. The results in different rapidity regions provide further information on the properties of the medium. The leptons at high $p_{\rm{T}}$ come mainly from beauty-hadron decays, therefore they are sensitive to transport properties of beauty quarks in the medium. Finally, the results obtained with the Event-Shape Engineering (ESE) technique applied to the D-meson $v_2$ in semi-central Pb--Pb events to investigate the influence of initial geometry fluctuations to heavy-flavour production will be shown.
Speaker: Xiaoming Zhang (Central China Normal University CCNU (CN)) -
15:15
Measurements of open charm hadron production in Au+Au collisions by the STAR experiment 15m
Charm quarks possess large masses and thus they are expected to be primarily produced at the initial stages of heavy-ion collisions. Hot and dense nuclear matter, usually referred to as the Quark-Gluon Plasma (QGP), can also be created in these collisions. Therefore, the QGP can be studied using charm quarks as penetrating probes via the in-medium energy loss, which is directly related to the intrinsic properties of the medium. In particular, a mass ordering of the parton energy loss in the hot medium is predicted, i.e. heavy-flavor quarks are expected to lose less energy than light quarks. Measurements of charm meson production in heavy-ion collisions provide a great opportunity to study the charm quark energy loss in the medium, and thus the QGP properties. Moreover, STAR has measured several species of charm hadrons and, therefore, can probe several modes of hadronization in the medium. In this presentation, we report the most recent measurements of the production of D$^0$ and D$^\pm$, as well as D$_\mathrm{s}$, containing a strange quark, and the $\Lambda_\mathrm{c}$ baryon in Au+Au collisions at the center-of-mass energy per nucleon-nucleon collision of $\sqrt{s_\mathrm{NN}} = 200\,$GeV. These particles are reconstructed via their hadronic decay channels, where the daughter particles can be tracked and identified with excellent precision.
Speakers: Mr Miroslav Simko (Nuclear Physics Institute of The Czech Academy of Sciences), Miroslav Simko (Nuclear Physics Institute of the Czech Academy of Sciences (cz)) -
15:30
Open heavy flavor dynamics in heavy ion collisions: RAA, v1, v2, v3 15m
We address the present theoretical challenge to have a self-consistent description of both the $R_{AA}(p_T)$
and the elliptic flow $v_2(p_T)$ at both RHIC and LHC.
We describe the heavy quarks dynamics in the quark-gluon plasma (QGP) by means of
a Boltzmann transport approach in which the non-perturbative interaction between
heavy quarks and light quark is described by means of a quasi particle approach.
Such a model is able to catch the main features of non-perturbative
interaction as the increasing of the interaction in the region of low temperature, which is a
fundamental ingredient to reproduce the experimental data for the nuclear suppression factor and the
elliptic flow.
We will also discuss the impact of radiative energy loss calculated in a multiple scattering and higher-twist scheme.
Moreover we point out that charm quarks may be an ideal probe of the initial electromagnetic field.
In fact thanks to their short formation time, subdominant thermal production and not very
large mass they can be a sensitive probe of the initial electromagnetic field and electric conductivity of the bulk matter.
Realistic simulation shows a charm/anti-charm opposite transverse flow $v_1$ of the order of a few
percent depending on the value of the electric conductivity of the bulk QGP.[1]S. K. Das, F. Scardina, S. Plumari, V. Greco, Phys.Rev. C90 (2014) 044901.
[2]S. K. Das, F. Scardina, S. Plumari, V. Greco, Phys.Lett. B747 (2015) 260-264.
[3]S. K. Das, S. Plumari, S. Chatterjee, J. Alam, F. Scardina, V. Greco, Phys.Lett. B768 (2017) 260-264.
Speaker: Salvatore Plumari (University of Catania (Italy)) -
15:45
Open heavy-flavour production in p-Pb collisions measured with ALICE at the LHC 15m
Heavy quarks (charm and beauty) are probes of the Quark-Gluon Plasma (QGP) formed in high-energy nuclear collisions. They are produced in hard partonic scattering processes occurring in the initial stage of the collisions, propagate through the medium, and interact with its constituents, thus probing the entire evolution of the system.
The heavy-flavour production in proton-nucleus collisions is sensitive to Cold Nuclear Matter effects (CNM), such as the modification of the parton distribution functions of nuclei due to shadowing or saturation, and parton energy loss in cold nuclear matter. These effects can induce a modification of the heavy-flavour production at low momentum and their measurement is required to understand final-state effects related to the presence of the QGP in Pb--Pb collisions.
The study of heavy-flavour production as a function of the multiplicity of charged particles produced in the collision can provide information on the dependence of CNM effects on the collision geometry and on the density of final-state particles.
In addition, the possible presence of collective effects in high-multiplicity p--Pb events could modify the $p_{\rm T}$ distributions of heavy-flavour hadrons.ALICE measures open heavy-flavour production via the reconstruction of D-meson hadronic decays and electrons from heavy-flavour hadron decays at mid-rapidity, and of muons from heavy-flavour hadron decays at forward rapidity. Recent results in p-Pb collisions at $\sqrt{s_{\rm NN}}$= 5.02 TeV collected during the Run-1 and Run-2 LHC periods will be presented. In particular, the production cross sections, nuclear modification factors (down to $p_{\rm T}$ = 0 for $D^{0}$ mesons), and multiplicity-dependent studies will be shown. The results will be compared with theoretical model predictions.
Speaker: Cristina Terrevoli (Universita e INFN, Padova (IT)) -
16:00
Coffee break 30m
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Universal strangeness production and size fluctuactions in small and large systems 15m
Strangeness production at high multiplicity gives indications on the transverse size fluctuactions in AA,pA and pp. In particular the universal behavior
of strange particle hadronization in small and large systems can be tested for the specific particle species, for different centralities and for large fluctuation of the transverse size
in pA and pp by using the recent ALICE data. The expected similar behavior between large and small systems at large energies is discussed on the basis of causality constraints.Speaker: Prof. Paolo Castorina (Dipartimento Fisica ed Astronomia- Università di Catania, Italy) -
16:45
Strangeness production in Pb-Pb collisions with ALICE at the LHC 15m
We present new ALICE results on the production of strange and multi-strange hadrons in Pb-Pb collisions at the top LHC energy of $\sqrt{s_{\rm NN}}$ = 5.02 TeV.
Strangeness production measurements are powerful tools for the study of the thermal properties of the deconfined state of QCD matter, the Quark-Gluon Plasma.
Thanks to its unique tracking and PID capabilities, ALICE is able to measure weakly decaying particles through the topological reconstruction of the identified hadron daughters.
Transverse momentum spectra of $K_{0}^{S}$, $\Lambda$, $\Xi$ and $\Omega$ at central rapidity are presented as function of the collision centrality.
The so-called baryon anomaly in the ratio $\Lambda/K_{0}^{S}$ is examined to probe particle production mechanisms: the position of the peak is sensitive to recombination processes, the high $p_{\rm T}$ part can provide revealing insights on fragmentation and, finally, the steepness of the rising trend featuring for $p_{\rm T} \leq$ 2 GeV/$c$ can be connected to the hydrodynamic expansion of the system.
In order to study strangeness enhancement, hyperon yields are normalised to the measurements of pion production in the corresponding centrality classes.
Comparisons to lower energy results as well as to different collision systems will be shown. This offers a complete experimental picture that is used as a benchmark for several commonly adopted phenomenological models, such as the thermal-statisical hadronisation approach.Speaker: Peter Kalinak (Slovak Academy of Sciences (SK)) -
17:00
Unidentified and identified hadron production in Pb-Pb collisions at the LHC with ALICE 15m
In this talk, the centrality dependence of the $p_{\rm T}$ spectra of unidentified charged hadrons as well as of charged pions, kaons, (anti)protons and resonances in Pb-Pb collisions at the unprecedented energy of $\sqrt{s_{\rm{NN}}} = 5.02$ are presented. The $p_{\rm T}$-integrated particle yields are compared to predictions from thermal-statistical models and the evolution of the proton to pion, kaon to pion and resonance to non-resonance particle ratios as a function of collision energy and centrality are discussed. Hydrodynamic and recombination models are tested against the measured spectral shapes at low and intermediate transverse momenta.
The measurement of a comprehensive set of resonances with lifetimes in a wide range of 1-46 fm/$c$ is suitable for a systematic study of the role of re-scattering and regeneration in the hadronic phase. The study of the energy dependence of the resonance to non-resonance particle ratio addresses the question whether the picture of the dominance of re-scattering effects over regeneration still holds at the higher energy, where the density and the volume of the system are expected to be larger.
Finally, the nuclear modification factor for the different particle species, which are found to be identical within the respective systematic uncertainties for transverse momenta above 8 GeV/$c$, will be shown.Speaker: Jacek Tomasz Otwinowski (Polish Academy of Sciences (PL)) -
17:15
Multiplicity dependence of the production of identified charged hadrons in pp and pPb collisions from CMS 15m
New results on transverse momentum spectra of identified charged hadrons in proton-proton collisions at sqrt(s) = 13 TeV are presented using CMS detector at the LHC. Charged pions, kaons, and protons in the transverse-momentum range pT = 0.1-1.7 GeV/c and for laboratory rapidities |y| < 1 are identified via their energy loss in the CMS silicon tracker. The pT spectra and integrated yields are compared to lower center-of-mass energy pp, and to similar energy pPb and PbPb results, as well as to Monte Carlo simulations.
For all collision systems studied, the average pT increases with particle mass and with the charged-particle multiplicity of the event as expected from theoretical predictions, among others from those based on gluon saturation. The results shows only a slight dependence of the average pT on the center-of-mass energy, indicating that particle production at LHC energies is strongly correlated with the charged-particle multiplicity rather than with the center-of-mass energy of the collision. The observed dependencies show that at TeV energies the characteristics of particle production in hadronic collisions are constrained mostly by the amount of initial parton energy available in a given collision.Speaker: Ferenc Siklér (Wigner RCP, Budapest (HU)) -
17:30
Recent results on (anti-)(hyper-)nuclei production in pp, p-Pb and Pb-Pb collisions with ALICE 15m
At the end of 2015 the ALICE experiment at the LHC has recorded Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, that complement the dataset from Run 1. Both datasets contain a variety of (anti-)(hyper-)nuclei produced in the collisions, namely (anti-)deuteron, (anti-)triton, (anti-)helium-3, (anti-)alpha and (anti-)hypertriton. Furthermore, the large high quality data sample of pp collisions at $\sqrt{s} = 7$ TeV and 13 TeV and in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5 TeV at the LHC with the ALICE detector allows for a systematic study of the light (anti-)nuclei production in these collision systems.
The identification of these (anti-)(hyper-)nuclei is based on the energy loss in the Time Projection Chamber and the velocity from the Time-Of-Flight detector. In addition, the Inner Tracking System is used to distinguish secondary vertices originating from weak decays. This is of particular importance for the measurement of (anti-)(hyper-)triton which decays weakly and has a decay length of several centimeters. The decay mode into a (anti-)helium-3 and a oppositely charged pion is the one with the largest reconstruction efficiency, but the largest branching ratio is given by the 3-body decay mode into a deuteron, a proton and a charged pion. The study of (anti-)(hyper-)nuclei production at both energies will be discussed and findings will be compared to model predictions. Emphasis will be put on new results of the hypertriton in its 2- and 3-body decay modes.
New results on deuteron production as a function of multiplicity in pp and p-Pb collisions will be presented, as well as the measurement of helium-3 in p-Pb collisions. The goal is to study production mechanisms such as coalescence in small systems, and to compare them to those in heavy-ion collisions.
Finally, the status of the ongoing searches for hypothetical strange pentaquarks and dibaryons will be discussed, together with perspectives for studies with the increased statistics from the LHC Run II.Speaker: Stefano Trogolo (Universita e INFN Torino (IT)) -
17:45
High pT single identified particles in various collision systems with the PHENIX detector at RHIC 15m
Jet quenching in the hot, dense medium formed in Au+Au collisions leads to the suppression of high $p_T$ particles which can be studied with the measurement of the leading hadrons, like $\pi_0$. They can be used to investigate the mechanism of energy loss of partons in a QGP when varying the collision geometry.
Asymmetric Cu+Au collisions provide a system with similar energy density but different collision geometry when compared to Au+Au, with the same number of nucleon-nucleon collisions. Furthermore, at RHIC we can study different highly asymmetric collisions, such as p+Au, d+Au and $^3$He+Au. The observation of collective behavior in these systems suggests the creation of a medium, but alternate explanations exist. The systematic study of the $\pi_0$ production could give us a deeper understanding of the physics in these very asymmetric systems.
We present new measurements of $\pi_0$ with PHENIX in the asymmetric collisions at midrapidity $|\eta|<$ 0.35 with collision energy $\sqrt{s_{NN}}$ = 200 GeV.
Speakers: Klaus Dehmelt (Stony Brook University USA), Klaus Dehmelt (State University of New York Stony Brook (US)), Klaus Dehmelt (Stony Brook University USA) -
18:00
News on spectra from the NA61/SHINE experiment. 15m
NA61/SHINE is a fixed target experiment at the CERN Super-Proton-Synchrotron. The main goals of the experiment are to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. In order to reach these goals, a study of hadron production properties is performed in nucleus-nucleus, proton-proton and proton-nucleus interactions as a function of collision energy and size of the colliding nuclei.
In this talk, recent results of particle production in p+p interactions, as well as Be+Be and Ar+Sc collisions in the SPS energy range are reviewed. Transverse momentum, transverse mass and rapidity spectra obtained with various analysis methods are presented. An implication of collective flow in central collisions of larger systems is discussed as well as surprises in studies on signatures of onset of deconfinement. The results are compared with available world data.Speaker: Magdalena Kuich (University of Warsaw (PL)) -
18:15
Measurements of vector meson photoproduction with ALICE in ultra-peripheral Pb-Pb collisions at sqrt(sNN) = 5.02 TeV 15m
The intense photon fluxes of relativistic nuclei provide a possibility
to study photonuclear and two-photon interactions in ultra-peripheral collisions (UPC)
where the nuclei do not overlap and no strong nuclear interactions occur.
The study of such collisions provides information about the initial state of nuclei (nPDF).Exclusive $J/\psi$ production in UPC which is sensitive to the nuclear
gluon distribution: first ALICE results from LHC Run 2 will be presented for
this channel for both forward and mid-rapidity $J/\psi$. The increased statistics
and the higher collision energy allows for a more detailed study of lower values of Bjorken-x.The analysis of the $\gamma+A \rightarrow \rho^0$+A process in UPC is a tool to test the, so-called, black disk regime
where the target nucleus appears like a black disk and the total $\rho^0$+A cross section reaches it quantum mechanical limit.
ALICE reports new measurements of $\rho^0$ photoproduction cross sections in Pb-Pb UPC at $\sqrt{s_{NN}}=5.02$ TeV
at mid-rapidity which are compared to predictions.Speaker: Valeri Pozdniakov (Joint Institute for Nuclear Research (RU))
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Neutrino physics Room Casinò (Palazzo del Casinò)
Room Casinò
Palazzo del Casinò
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14:30
Overview of knowns and unknowns in the standard three-neutrino framework 30m
A global analysis of neutrino masses and mixings, performed within the standard three-neutrino framework, is presented. The combination of current data coming from oscillation experiments, neutrinoless double beta decay searches, and cosmological surveys, provides interesting constraints on the known mass-mixing parameters, as well as intriguing hints on the unknown ones. Concerning the latter, we confirm previous hints favoring nonmaximal theta-23 mixing, and nearly maximal leptonic CP violation. We also find that the so-called normal ordering (NO) of neutrino masses appears to be somewhat favored with respect to inverted ordering (IO) at the level of ~2 sigma, mainly by neutrino oscillation data (especially atmospheric), corroborated by cosmological data in some cases. Detailed constraints are obtained via the chi^2 method, by expanding the parameter space either around separate minima in NO and IO, or around the absolute minimum in any ordering. Implications for upcoming oscillation and non-oscillation neutrino experiments, including beta-decay searches, are also discussed. [Main reference paper: arXiv:1703.04471]
Speaker: Eligio Lisi (INFN, Bari, Italy) -
15:00
Sensitivity of the DUNE Experiment to CP Violation and to physics beyond the SM 15m
The Deep Underground Neutrino Experiment (DUNE) is a long-baseline neutrino oscillation experiment with primary physics goals of determining the neutrino mass hierarchy and measuring delta_CP with sufficient sensitivity to discover CP violation in neutrino oscillation. CP violation sensitivity in DUNE requires careful understanding of systematic uncertainty, with contributions expected from uncertainties in the neutrino flux, neutrino interactions, and detector effects. In this presentation, we will describe the expected sensitivity of DUNE to long-baseline neutrino oscillation parameters, how various aspects of the experimental design contribute to that sensitivity, and the planned strategy for constraining systematic uncertainty in these measurements.
The detector-beam configuration also provides an excellent opportunity to study physics beyond standard neutrino oscillations. DUNE will be able to search for or constrain a wide variety of physics phenomena beyond the Standard Model, such as, light sterile neutrinos, nonstandard neutrino interactions, large extra-dimensions, heavy neutrinos, lepton flavor violation, and low mass dark matter. In this talk, we will present preliminary DUNE sensitivities to physics beyond the Standard Model and discuss the potential of DUNE in understanding these phenomena.
Speakers: Dr Justo Martin-Albo (Oxford), Dr Justo Martin-Albo (University of Oxford (GB)), Justo Martin-Albo Simon (Universidad de Valencia) -
15:15
The Hyper-Kamiokande Experiment 15m
Hyper-Kamiokande is a planned next-generation multi-purpose megaton-scale water Cherenkov detector in Japan. It is situated along the same J-PARC beam line as T2K. The detector, which is heavily influenced by its successful predecessor Super-Kamiokande, will consists of two cylindrical tanks filled with 260 ktons of ultrapure water, a volume approximately 10 times larger than Super-Kamiokande. 40,000 ultrasensitive photo-sensors will clad its internal volume and 6,700 on the external detector faces. This massive undertaking pro-vides challenges for R&D, calibration, DAQ and construction. We will present the current detector design, systems and status, as well as its capability to address the fundamental question of the CP violation in the leptonic sector. Results assuming the second tank based in Korea will also be presented.
Speaker: Dr Benjamin Richards (QMUL) -
15:30
An Intermediate Water Cherenkov Detector for the T2K and Hyper-K Experiments 15m
The Japan based long baseline neutrino program aims for the discovery of CP violation in neutrino mixing and precision measurements of neutrino oscillation parameters at the T2K and Hyper-K experiments. Achieving these goals will require the collection of large data sets and the reduction of systematic uncertainties to the few percent level. Dominant systematic errors arise in the modeling of (anti)neutrino-nucleus interactions in water, and these errors can be reduced with measurements in an intermediate water Cherenkov detector located near the neutrino source at J-PARC. To this end, intermediate water Cherenkov detectors such as NuPRISM and TITUS have been proposed. These detectors include features such as an off-axis angle spanning configuration to measure the energy dependence of neutrino interactions and Gd loading to measure final state neutron multiplicities in neutrino interactions. In this talk, we present a unified program for intermediate water Cherenkov detectors in the J-PARC neutrino beam that supports that physics programs of T2K and Hyper-K.
Speaker: Dr Michael Wilking -
15:45
Neutrino-nucleus scattering at nuSTORM 15m
The nuSTORM facility will provide \nu_e and \nu_\mu beams from the
decay of low energy muons confined within a storage ring. The
instrumentation of the ring, combined with the excellent knowledge of
muon decay, will make it possible to determine the neutrino flux at
the %-level or better. The neutrino and anti-neutrino event rates are
such that the nuSTORM facility serving a suite of near detectors will
be able to measure \nu_eN and \nu_\muN cross sections with the %-level
precision required to allow the next generation of long-baseline
neutrino-oscillation experiments to fulfil their potential. By
delivering precise cross section measurements with a pure weak probe
nuSTORM may have the potential to make measurements important to
understanding the physics of nucleii. The precise knowledge of the
initial neutrino flux also makes it possible to deliver uniquely
sensitive sterile-neutrino searches. The concept for the nuSTORM
facility will be presented together with an evaluation of its
performance. The status of the planned consideration of nuSTORM at
CERN in the context of the Physics Beyond Colliders workshop will be
summarised.Speaker: Kenneth Richard Long (Imperial College (GB)) -
16:00
Coffee break 30m
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16:30
Neutrino CP Violation with the ESSnuSB project 15m
After measuring in 2012 a relatively large value of the neutrino mixing angle θ13, the door is now open to observe for the first time a possible CP violation in the leptonic sector. The measured value of θ13 also privileges the 2nd oscillation maximum for the discovery of CP violation instead of the usually used 1st oscillation maximum. The sensitivity at this 2nd oscillation maximum is about three times higher than for the 1st oscillation maximum inducing a lower influence of systematic errors. Going to the 2nd oscillation maximum necessitates a very intense neutrino beam with the appropriate energy. The world’s most intense pulsed spallation neutron source, the European Spallation Source, will have a proton linac with 5 MW power and 2 GeV energy. This linac, under construction, also has the potential to become the proton driver of the world’s most intense neutrino beam with very high potential to discover a neutrino CP violation. The physics performance of that neutrino Super Beam in conjunction with a megaton underground Water Cherenkov neutrino detector installed at a distance of about 500 km from ESS has been evaluated. In addition, the choice of such detector will extent the physics program to proton–decay, atmospheric neutrinos and astrophysics searches. The ESS proton linac upgrades, the accumulator ring needed for proton pulse compression, the target station optimization and the physics potential are described. In addition to neutrinos, this facility will also produce at the same time a copious number of muons which could be used by a low energy nuSTORM facility, a future neutrino factory or a muon collider. The ESS neutron facility will be fully ready by 2023 at which moment the upgrades for the neutrino facility could start.
This project supported by the COST Action CA15139 "Combining forces for a novel European facility for neutrino-antineutrino symmetry-violation discovery" (EuroNuNet).Speaker: Marcos Dracos (Institut Pluridisciplinaire Hubert Curien (FR)) -
16:45
The ENUBET project: high precision neutrino flux measurements in conventional neutrino beams 15m
The precision era of neutrino physics requires measurements of absolute neutrino cross sections at the GeV scale with exquisite (1%) precision. These measurements are presently limited by the uncertainties on neutrino flux: the goal of the ERC ENUBET Project is to demonstrate that such uncertainties can be removed employing novel monitoring techniques of the leptons at the neutrino source. In particular, a reduction of these systematics by one order of magnitude can be achieved monitoring the positron production in the decay tunnel originating from the K_e3 decays of charged kaons in a sign and momentum selected narrow band beam. In this talk we present the results obtained during the first year of the Project on beamline simulation, rate and dose assessment, detector prototyping and evaluation of the physics reach. In particular, we present the Reference Design issued by the Collaboration in spring 2017, discussing its achievements and the remaining technical challenges.
Speaker: Francesco Terranova (Universita & INFN, Milano-Bicocca (IT)) -
17:00
SuperK-Gd 15m
The Super-Kamiokande (SK) Collaboration has committed to the the SuperK-Gadolinium project that, by dissolving a Gd salt at 0.2 % in mass in the SK water, will upgrade the detector to be able to identify neutrons with very high efficiency. The current expected time
for refurbishment of SK and start of this new phase is 2018.
In this talk we present the physics benefits of high efficiency neutron tagging in Super-Kamiokande, the very extensive R&D program followed towards the decision, and the most relevant steps in the implementation of the SuperK-gadolinium project.Speakers: Luis Labarga (UAM), Luis Labarga (UAM) -
17:15
Studying Neutrino Oscillations and Searches for BSM Physics with Atmospheric Neutrinos in DUNE 15m
The 40kt DUNE Far Detector, located at the Sanford Underground Research Facility, will offer unique capabilities for the study of atmospheric neutrinos. Due to the detector’s excellent energy resolutions, angular resolutions, and particle ID capabilities, atmospheric neutrino analyses in DUNE can provide valuable information about 3-flavor oscillations, despite the relatively modest statistics. These data provide a complementary analysis approach to beam neutrinos, and can help resolve ambiguities in beam-only analyses. In this talk we will focus on the determination of the mass hierarchy, octant of theta23, and measurement of Delta_CP using atmospheric neutrinos in DUNE. Atmospheric neutrinos can also lead to a variety of beyond the standard model scenarios for neutrino transitions, propagation, and interactions. Examples that have been previously studied include CPT violation, Lorentz invariance violation, non-standard interactions, Mass Varying Neutrinos (MaVaNs), and sterile neutrinos.
Speakers: Dr Aaron Higuera (Houston), Aaron Higuera (University of Houston), Aaron Higuera (Fermilab) -
17:30
Neutrino Oscillation Physics and Proton Decay with Hyper-Kamiokande 15m
Hyper-Kamiokande is a next generation water Cherekov detector consisting of 2 tanks,each with 187 kton fiducial mass, to be built in a staged approach.
Hyper-Kamiokande will detect neutrinos produced by the upgraded J-PARC accelerator complex, as well as atmospheric neutrinos.
It will make precision measurements of neutrino mixing parameters by a combination of accelerator and atmospheric neutrinos and it will enable us to search for proton decay and other exotic phenomena with an order of magnitude more data than current experiments. This talk will describe this rich physics program. Recent studies of the option for building the second tank in Korea to probe mass hierarchy will also be presented.Speakers: Luis Labarga (UAM), Luis Labarga (UAM) -
17:45
Status and Perspectives of KM3NeT/ORCA 15m
The KM3NeT collaboration is constructing megaton-scale neutrino detectors at a depth of 2500m in the Mediterranean Sea.
These detectors, named ARCA and ORCA are each made up of a three-dimensional array of spherical optical modules, each of which contains 31 3" photomultiplier tubes, designed to detect Cherenkov light emitted by charged leptons produced by neutrino interactions in and around the instrumented volume.
These are packed either sparsely (ARCA) or densely (ORCA), depending on the target energy.
ORCA, which is under construction off the coast of Toulon in France, will study atmospheric neutrino oscillations in the 1-100 GeV range.
This will address multiple outstanding issues in neutrino oscillation research, including ascertaining the neutrino mass ordering.
Physics studies indicate that this can be determined with a significance of 3-7 sigma (depending on the true value of the hierarchy and the the value of the mixing angle $\theta_{23}$) after three years of operation.Speaker: Mr Liam Quinn (CPPM) -
18:00
Status and perspectives of JUNO experiment 15m
Precise measurements of the $\theta_{13}$ neutrino oscillation parameter by the Daya Bay, RENO and Double Chooz experiments have opened the path to the determination of the neutrino mass hierarchy. Indeed whether the $\nu_3$ neutrino mass eigenstate is heavier or lighter than the $\nu_1$ and $\nu_2$ mass eigenstates is one of the remaining undetermined fundamental aspects of the Standard Model in the lepton sector. Mass hierarchy determination would have an impact in the quest of the neutrino nature (Dirac or Majorana mass terms) towards the formulation of a theory of flavor. In addition to providing an important input to future experiments and other fields like cosmology, the determination of the mass hierarchy would represent a major step forward towards the understanding of the origin and nature of neutrino masses.
The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator neutrino detector under construction in the south of China. Thanks to the large 20~kton active mass and unprecedented energy resolution (3% at 1 MeV) it will allow to determine the neutrino mass hierarchy with good sensitivity and to precisely measure the neutrino mixing parameters, $\theta_{12}$, $\Delta m_{21}^2$ and $\Delta m_{ee}^2$ with < 1% precision. Moreover, a large liquid scintillator detector will allow to explore physics beyond mass hierarchy determination and provide fundamental results on many topics in astroparticle physics, like supernova burst and diffuse supernova neutrinos, solar neutrinos, atmospheric neutrinos, geo-neutrinos, nucleon decay, indirect dark matter searches and a number of additional exotic searches. The talk will review the status of the experiment and give highlights on the physics reach.Speaker: Agnese Giaz -
18:15
Neutrino Physics at ADS Facilities 15m
Accelerator Driven System (ADS) subcritical reactors are being developed around the world. The main goals of this kind of facility are to produce energy and, at the same time, to dispose of nuclear waste, which will be used to power nuclear reactors. Since, by itself, used nuclear fuel is not able to sustain a chain reaction, the additional neutrons needed will be supplied by a high-intensity accelerator, where a proton beam will be hitting a spallation target. This accelerator will produce, as a by-product, a large quantity of neutrinos: I will discuss the opportunities offered by this kind of facilities to the study of neutrino physics. I will focus in particularly on the accelerators that will be constructed as part of the China-ADS program: here in the first phases of the project $\bar{\nu}_e$ can be produced via Isotope Decay At Rest (IsoDAR): they can be detected with liquid scintillators and used to provide competitive bounds on sterile neutrinos in the disappearance channel. In the next phases, when the beam energy is higher, $\bar{\nu}_\mu$ will be produced via muon Decay At Rest ($\mu$DAR): in this phase it will be possible to measure the CP-violating phase $\delta_{CP}$ and to look for experimental signs of the presence of sterile neutrinos in the appearance channel, testing the LSND and MiniBooNE anomalies.
Speaker: Prof. Emilio Ciuffoli (IMP, CAS)
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QCD and hadronic physics Room Mosaici-1 (Palazzo del Casinò)
Room Mosaici-1
Palazzo del Casinò
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14:30
Precise predictions for V+jet production 30m
The production of electroweak gauge bosons in association with a jet, V+jet, constitutes an important class of standard-candle processes at the LHC. The requirement of an additional hadronic jet in the final state introduces a direct sensitivity to the strong coupling constant and the gluon PDF, while still retaining a large event rate. As such, V+jet production provides an ideal testing ground for our understanding of both strong and electroweak interactions in a hadron-collider environment.
I give a brief review of the recent theory developments for this process class and present their phenomenological results. I further discuss how these calculations can be used for closely related observables, such as the $p_T$ spectrum of the gauge boson, and their impact on the interpretation of experimental data.
Speaker: Alexander Huss (ETH Zurich) -
15:00
Measurements of the production of jets in association with a W or Z boson with the ATLAS detector 15m
The production of jets in association with vector bosons is an important process to study perturbative QCD in a multi-scale environment. The ATLAS collaboration has performed new measurements of vector boson + jets cross sections, differential in several kinematic variables, in proton-proton collision data taken at center-of-mass energies of 8 TeV and 13 TeV. The measurements are compared to state-of-the art theory predictions. They are sensitive to higher-order pQCD effects, probe flavour and mass schemes and can be used to constrain the proton structure.
In addition, we present a new measurement of the splitting scales of the kt jet-clustering algorithm for final states containing a Z-boson candidate at a centre-of-mass energy of 8 TeV.
Speaker: Lianyou Shan (Chinese Academy of Sciences (CN)) -
15:15
Measurements of Vector boson fusion with the ATLAS detector 15m
The most recent results on the production of single W and Z bosons with two jets at high invariant mass at centre-of-mass energies of 7, 8 and 13 TeV are presented. Integrated and differential cross sections are measured in different phase space regions with varying degree of sensitivity to the electroweak production in vector boson fusion. The cross section for the electroweak W boson production has been extracted for both integrated and for the first time differential distributions. In addition, the cross-section for the electroweak production of two jets in association with a Z boson is measured for the first time at a centre-of-mass energy of 13 TeV. The results are compared to state-of-the-art theory predictions and are used to constrain anomalous gauge couplings.
Speaker: Kurt Brendlinger (Deutsches Elektronen-Synchrotron (DE)) -
15:30
Electroweak and QCD aspects in V+jets with CMS 15m
The study of the associated production of vector bosons and jets constitutes an excellent testbench to check numerous QCD predictions. Total and differential cross sections of vector bosons produced in association with jets has been studied at both 8 and 13 TeV center-of-mass energies. Differential distributions as function of a broad range of kinematical observables are measured and compared with theoretical predictions. Final states with a vector boson and jets can be also used to study electroweak initiated processes, such as the vector boson fusion production of a Z boson accompanied by a pair of energetic jets having large invariant mass.
Speaker: Nadezda Chernyavskaya (Eidgenoessische Tech. Hochschule Zuerich (CH)) -
15:45
V+heavy flavor jets and constraints to PDFs with CMS 15m
The associated production of vector bosons, W or Z, and jets originating from heavy-flavour quarks is a large background source in measurements of several standard model processes, Higgs boson studies, and many searches for physics beyond the SM. The study of events with one or two well-identified and isolated leptons accompanied by heavy-flavour jets is crucial to refine the theoretical calculations in perturbative QCD, as well as to validate associated Monte Carlo techniques. Using the LHC proton-proton collision data at centre-of-mass energies of 7 and 8 TeV collected by the CMS detector, Wbb, Zb(b), W+c, and Z+c cross sections are measured. Fiducial differential cross sections are measured as a function of several kinematic observables. The study of the associated production of a vector boson with jets from a c-quark is specially interesting to improve the treatment of heavy quarks in PDF-related studies. The production of a W boson associated with a c-quark allows probing and constraining the strange quark content of the proton. The associated production of a Z boson and c-quark jets may give insight into the existence of an intrinsic charm quark component inside the proton.
Speaker: Svenja Karen Pflitsch (Deutsches Elektronen-Synchrotron (DE)) -
16:00
Coffee break 30m
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Interplay of QCD and EW corrections and precision physics at hadron colliders 30m
Precision tests of the Standard Model can be successfully performed at the LHC
only if QCD and EW radiative corrections are under control.
In this presentation I will discuss the non trivial interplay between the two sets of corrections, using several observables which can be measured in the Drell-Yan processes to illustrate the conceptual and technical problems that arise in the determination of EW parameters with an accuracy below the per mil level.Speaker: Alessandro Vicini (Università degli Studi e INFN Milano (IT)) -
17:00
Higher-order QED effects in hadronic processes 15m
In this talk, we describe the computation of higher-order QED effects relevant in hadronic collisions. In particular, we discuss the calculation of mixed QCD-QED one-loop contributions to the Altarelli-Parisi splittings functions, as well as the pure two-loop QED corrections. We explain how to extend the DGLAP equations to deal with new parton distributions, emphasizing the consequences of the novel corrections in the determination (and evolution) of the photon distributions.
Speaker: German Sborlini (IFIC-Valencia) -
17:15
Extended studies of isolated photon production in deep inelastic scattering at HERA 15m
Isolated photons with high transverse energy components have been studied in $ep$
scattering with the ZEUS detector at HERA, using 326 pb$^−1$ integrated luminosity. The kinematic region includes photon virtualities 10 < $Q^2$ < 350 GeV$^2$. Photons with transverse energy 4 < $E_T^\gamma$ < 15 GeV and pseudorapidity −0.7 < $\eta^\gamma$ < 0.9 were measured with accompanying jets having transverse energy and pseudo rapidity 2.5 < $E_T^{jet}$ < 35 GeV and −1.5 < $\eta^{jet}$ < 1.8. Differential cross sections are presented for the following variables: the fraction of the incoming photon energy and momentum that is transferred to the photon and the jet, the fraction of proton energy taken by the parton that interacts with the photon, and the azimuthal angle and the pseudorapidity difference between the prompt photon and the jet and between the prompt photon and the scattered electron. Comparisons are made with several different theoretical calculations: a leading-logarithm Monte Carlo simulation, a next-to-leading-order QCD calculation and a calculation using the $k_T$ factorisation approach.Speaker: Ian Brock (University of Bonn (DE)) -
17:30
Measurement of photon production cross sections with the ATLAS detector 15m
The production of prompt isolated photons at hadron colliders provides a stringent test of perturbative QCD and can be used to probe the proton structure. The ATLAS collaboration has performed precise measurements of the inclusive production of isolated prompt photons at a center-of-mass energy of 13 TeV, differential in both rapidity and the photon transverse momentum. In addition, the integrated and differential cross sections for isolated photon pairs at 8 TeV have been measured. The results are compared with state-of-the-art theory predictions at NLO in QCD and with predictions of several MC generators.
The production of prompt photons in association with jets provides an additional testing ground for perturbative QCD (pQCD) with a hard colourless probe less affected by hadronisation effects than jet production. The ATLAS collaboration has studied the dynamics of isolated-photon plus jet production in pp collisions at a centre-of-mass energy of 8 and 13 TeV, which will be presented and discussed.
Speaker: Ruggero Turra (Università degli Studi e INFN Milano (IT)) -
17:45
Prompt photon production and photon-jet correlations with POWHEG 15m
Photon production, also in association with jets, is an important
probe of the quark gluon plasma. For many decades, theoretical
predictions of prompt photon production have been based on next-
to-leading order (NLO) calculations. We present a recalculation
of this process at NLO and combine it with parton showers (PS) in
the POWHEG framework. This allows for the first time full NLO+PS
simulations, including also hadronisation and detector effects. Of
particular phenomenological importance are the induced modifactions
of the transverse-momentum balance and azimuthal angle asymmetry
between the photon and recoiling jet, present now already in pp
and not only in AA collisions.Speaker: Michael Klasen -
18:00
EW boson production at LHCb 15m
LHCb, while purpose built for b-physics, also functions as a general purpose forward detector, covering the pseudo-rapidity range 2.0 to 5.0. We present the latest measurements of W and Z boson production. These benchmark measurements are used to constrain the parton distribution functions that describe the inner structure of the proton, and to test the modelling of Standard Model processes. These measurements can also be used to validate reconstruction techniques.
Speaker: Lorenzo Sestini (Universita e INFN, Padova (IT)) -
18:15
The photon PDF from high-mass Drell Yan data at the LHC using xFitter 15m
We present the xFitter project (former HERAFitter) which provides a unique open-source software framework for the determination of the proton's PDFs and for the interpretation of the physics analyses in the context of Quantum Chromodynamics.
We highlight the new xFitter software release which includes state-of-the-art
theoretical developments. We present a novel determination of the photon PDF from fits to the recent ATLAS measurements of high-mass Drell-Yan production at 8 TeV.
This analysis is based on the new xFitter framework which has required improvements both in the APFEL program, to account for NLO QED effects for the first time, and in the aMCfast interface to account for the photon-initiated contributions in the EW calculations within MadGraph5_aMC@NLO.
The results are compared with other recent QED fits and determinations of the photon PDF, where consistent results are found.Speaker: Mr Francesco Giuli (University of Oxford (GB))
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Cosmology, dark energy, gravitational waves Room Martinelli (Palazzo del Casinò)
Room Martinelli
Palazzo del Casinò
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09:00
Hairs of discrete symmetries 15m
Gauge symmetries are known to be respected by gravity because gauge charges carry flux lines, but global charges do not carry flux lines and are not conserved by gravitational interaction. For discrete symmetries, they are spontaneously broken in the Universe, forming domain walls. Since the realization of discrete symmetries in the Universe must involve the vacuum expectation values of Higgs fields, a string-like configuration (hair) at the intersection of domain walls in the Higgs vacua can be realized. Therefore, we argue that discrete charges are also respected by gravity.
Speaker: Prof. Jihn E. Kim (Kyung Hee University) -
09:15
Observable Gravitational Waves from Higgs Inflation in SUGRA 15m
Abstract content
We consider models of chaotic inflation driven by the real parts
of a conjugate pair of Higgs superfields involved in the
spontaneous breaking of a grand unification symmetry at a scale
assuming its Supersymmetric value. Employing Kaehler potentials
with a prominent shift-symmetric part proportional to c- and a
tiny violation, proportional to c+, included in a logarithm we
show that the inflationary observables provide an excellent match
to the recent Planck and Bicep2/Keck Array results setting, e.g.,
0.012<= c+/c- <=1/N where N=2 or 3 is the prefactor of the
logarithm. Deviations of these prefactors from their integer
values above are also explored and a region where hilltop
inflation occurs is localized. Moreover, we analyze several
possible stabilization mechanisms for the non-inflaton
accompanying superfield using just quadratic terms. In all cases,
inflation can be attained for subplanckian inflaton values with
the corresponding effective theories retaining the perturbative
unitarity up to the Planck scale.Speaker: Costas Pallis (University of Cyprus) -
09:30
Adiabaticity and gravity theory independent conservation laws for cosmological perturbations 15m
We carefully study the implications of adiabaticity for the behavior of
cosmological perturbations. There are essentially three similar but
different definitions of non-adiabaticity: one is appropriate for
a thermodynamic fluid $\delta P_{nad}$, another is for a general matter field
$\delta P_{c,nad}$, and the last one is valid only on superhorizon scales.
The first two definitions coincide if $c_s^2=c_w^2$ where
$c_s$ is the propagation speed of the perturbation, while
$c_w^2=\dot P/\dot\rho$.
Assuming the adiabaticity in the general sense, $\delta P_{c,nad}=0$,
we derive a relation between the lapse function in the comoving sli-cing $A_c$
and $\delta P_{nad}$ valid for arbitrary matter field in any theory of gravity,
by using only momentum conservation.
The relation implies that as long as $c_s\neq c_w$,
the uniform density, comoving and the proper-time slicings
coincide approximately for any gravity theory and for any matter field
if $\delta P_{nad}=0$ approximately.
In the case of general relativity this gives the equivalence
between the comoving curvature perturbation $R_c$
and the uniform density curvature perturbation $\zeta$
on superhorizon scales, and their conservation.
This is realized on superhorizon scales in standard slow-roll inflation.We then consider an example in which $c_w=c_s$, where $\delta P_{nad}=\delta P_{c,nad}=0$
exactly, but the equivalence between $R_c$ and $\zeta$ no longer holds.
Namely we consider the so-called ultra slow-roll inflation.
In this case both $R_c$ and $\zeta$ are not conserved.
In particular, as for $\zeta$, we find that it is crucial to take into
account the next-to-leading order term in $\zeta$'s spatial gradient expansion
to show its non-conservation, even on superhorizon scales.
This is an example of the fact that adiabaticity (in the thermodynamic sense) is not always enough to ensure
the conservation of $R_c$ or $\zeta$.Speaker: Antonio Enea Romano (Universidad de Antioquia (CO)) -
09:45
Inflation with dissipation and metastability 15m
We analyze two models in which primordial inflation has non-standard features. In the first model we study the evolution of a system in which the inflaton is slowed down by dissipation of energy into gauge bosons instead of the usual Hubble friction: in particular we study the conditions of the onset of such a scenario from a static field configuration and we briefly mention some difficulties of the treatment of perturbations. In the second model we consider the case of a metastable vacuum which sources exponential inflation and we show that the presence of scalar-tensor gravity can induce a power-law expansion which allows successful tunneling. We also analyze the case in which such a metastable vacuum might be in the Standard Model Higgs potential.
Speaker: Dr Alessio Notari (Universitat de Barcelona) -
10:00
Cosmology of self-gravitating media 15m
The low-energy dynamics of a generic self-gravitating media can be studied by using effective field theory in terms four derivatively coupled scalar fields. Imposing SO(3) internal spatial invariance, the theory describes fluids, superfluids, solid and supersolids. Dynamical and thermodynamical properties of the medium are dictated by internal symmetries of the effective theory. From the analysis of cosmological perturbations it emerges that in the scalar sector, besides the gravitational potential, a non-adiabatic mode corresponding to the perturbations of entropy per particle σ. Perfect fluids and solids are adiabatic with constant in time σ while for superfluids and supersolids σ has non-trivial dynamics. Tensor perturbations are massive for solid and supersolid. Such an effective approach can be used to give a very general modelling of the dark sector based on symmetries.
Based on Phys.Rev. D94 (2016) 124023 (arXiv:1603.02956), Phys.Rev. D94 (2016) 025034 (arXiv:1605.05304) and a forthcoming additional paper.
Speaker: Luigi Pilo (Dept. of Physical and Chemical Sciences, Univ. of L'Aquila and INFN, Laboratori Nazionali del Gran Sasso, Italy ) -
10:15
Detecting quantum gravity in the sky 15m
We show that the dimension of spacetime becomes complex-valued when its short-scale geometry is invariant under a discrete scaling symmetry. This characteristic can arise either in quantum gravities based on combinatorial or multifractal structures or as the partial breaking of continuous dilation symmetry in any conformal-invariant theory. With its infinite scale hierarchy, discrete scale invariance overlaps with the traditional separation between ultraviolet and infrared physics and it can leave an observable imprint in the cosmic microwave background. We discuss such imprint in the form of log oscillations and sharp features in the primordial power spectrum.
Speaker: Dr Gianluca Calcagni (IEM-CSIC) -
10:30
The turnaround radius as a probe of dark energy and modified gravity 15m
In an accelerating universe a maximum radius exists above which a shell of test particles cannot collapse and disperses due to the cosmic expansion. Observations of this turnaround radius for large structures could constrain the
effective equation of state of dark energy. We use the Hawking quasilocal mass to make the concept of turnaround radius well defined in general relativity and
then we extend it to modified theories of gravity for which the gravitational slip is non-vanishing.[Based on V. Faraoni, M. Lapierre-Leonard & A. Prain 2015,JCAP 10, 013; V. Faraoni 2016, Phys. Dark Universe 11, 11]
Speaker: Prof. Valerio Faraoni (Bishop's University) -
10:45
Decoupling effects in the running of the Cosmological Constant 15m
We revisit the decoupling effects associated with heavy particles in the renormalization group running of the vacuum energy in a mass-dependent renormalization scheme. We find the running of the vacuum energy stemming from the Higgs condensate in the entire energy range and show that it behaves as expected from the simple dimensional arguments meaning that it exhibits the quadratic sensitivity to the mass of the heavy particles in the infrared regime. The consequence of such a running to the fine-tuning problem with the measured value of the Cosmological Constant is analyzed and the constraint on the mass spectrum of a given model is derived. We show that in the Standard Model (SM) this fine-tuning constraint is not satisfied while in the massless theories this constraint formally coincides with the well known Veltman condition. We also provide a remarkably simple extension of the SM where saturation of this constraint enables us to predict the radiative Higgs mass correctly. Generalization to constant curvature spaces is also given.
Speakers: Prof. Blazenka Melic (Rudjer Boskovic Institute, Zagreb), Blazenka Melic, Blazenka Melic (IRB, Zagreb), Blazenka Melic -
11:00
Coffee break 30m
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NIKA2: a mm camera for cluster cosmology 15m
Clusters of galaxies are unique cosmological probes sensitive to the primordial density fluctuations, and the expansion history and energy content of the Universe. The thermal Sunyaev-Zeldovich (tSZ) effect is an observable of choice for cluster cosmology due tothe low scatter in the relationship between SZ flux and cluster mass, and the construction of large tSZ selected cluster catalogs by Planck, ACT and SPT. However, there exists a weak discrepancy between cluster and CMB cosmological constraints, which may due to bias in the observable-mass relation. Physical processes at play in clusters may be at the origin of this bias and could affect more importantly high redshift clusters. Thus, accurate cluster cosmology requires detailed mapping of the cluster emission from the core to the outskirts.
This is the purpose of the NIKA2 tSZ large program, aiming at mapping a representative sample of 50 tSZ selected high redshift clusters, 0.5 < z < 1.0, for a total of 300 hours of observation. NIKA2 is a dual-band camera made of 2680 KIDs operating at 150 and 260 GHZ, installed at the IRAM 30 m telescope, with a FOV of 6.5', and 18" and 12" resolution at 150 and 260 GHz. With such instrumental capabilities NIKA2 is a unique instrument for tSZ observations making possible high sensitivity mapping of high redshift clusters in a few hours. The main output of the NIKA2 tSZ program will be the study of the redshift evolution of the cluster pressure profiles as well as that of the scaling laws relating the cluster global properties. X-ray observations of the NIKA2 cluster sample obtained with the XMM Newton satellite will be also used.
We will review current cluster cosmology results and describe the NIKA2 instrument and its prototype NIKA1. We will illustrate the NIKA2 tSZ capabilities using recent NIKA1 results in a pilot sample of high redshift clusters. Finally, we will present the NIKA2 tSZ LP, synergy with the X-ray observations, and cosmological perspectives.
Speaker: Dr Juan Francisco Macias-Perez (LPSC) -
11:45
QUBIC: the Q&U Bolometric Interferometer for Cosmology. A novel way to look at the polarized Cosmic Microwave Background. 15m
In this presentation I will talk about QUBIC, an experiment that takes up the challenge posed by the detection of primordial gravitational waves with a novel approach. Detecting the signature left by primordial gravity waves in the Cosmic Microwave Background (CMB) entails measuring a tiny polarized component of the CMB, the so-called B-modes, that is literally buried in polarized astrophysical foregrounds and can be disguised by instrumental systematic effects. Deploying instruments with tens of thousands of detectors is not enough to measure this elusive, sub-μK signal; one has to effectively control the foreground and instrumental contributions. QUBIC responds to these needs by combining the sensitivity of state-of-the art bolometric detectors with the systematic effects control typical of interferometers, allowing us to clean the measured data from instrumental effects by exploiting the so-called “self-calibration”, a technique deeply rooted in the interferometric nature of the instrument. In my talk I will first highlight the challenges posed by CMB B-modes measurements and then focus on the development of the first module of QUBIC, a dual band instrument (150 GHz and 220 GHz) that will be deployed in Argentina during the Fall of 2018.
Speakers: Prof. Aniello Mennella (University of Milan, Department of Physics), Aniello Mennella (Università di Milano - Physics) -
12:00
Future CMB projects 15m
As the Planck mission is delivering its ultimate results, it has become clear that much is still to be learnt from additional observations of the Cosmic Microwave background. In the light of current results and remaining questions, I will discuss the scientific case of some of the main future CMB projects, their complementarity, and how to address the challenges of measurement accuracy and of detailed characterization of the observations that are required for precision cosmology with these future experiments.
Speaker: Jacques Delabrouille (CNRS) -
12:15
Cosmology with the Baryon Oscillation Spectroscopic Survey (BOSS) 15m
I will present an overview of the final results from the SDSS-III BOSS analysis (DR12). Using the galaxy power spectrum and correlation function, BOSS was able to measure the Baryon Acoustic Oscillations scale in two independent redshift bins to 1% precision. Such constraints allow to map out the expansion history of the Universe and represent one of the most important cosmological tools at low redshift. I will also present the latest constraints on the growth of structure, which allow tests of modified gravity theories and help to constrain the sum of the neutrino masses.
Speaker: Florian Beutler (University of Portsmouth) -
12:30
Measuring baryon acoustic oscillations using the distribution of intergalactic gas 15m
The Baryon Oscillation Spectroscopic Survey (BOSS) of SDSS-III has ushered in a new era for high-redshift quasar surveys studying the large-scale structure of the Universe through intervening absorption by the intergalactic gas. The unprecedented number of quasar absorption spectra provided by BOSS allows us to measure the expansion rate and geometry of the Universe at redshift z>2 using baryon acoustic oscillations (BAO) imprinted in large-scale structures. I will present the latest measurements of the BAO scale using the absorption auto-correlation and cross-correlation with quasars based on 160,000 quasar spectra taken from SDSS-III Data Release 12. By combining the BAO results from the auto- and cross-correlation, the Hubble parameter is measured with a precision of nearly 2%, providing direct evidence that the cosmic expansion was decelerating 11 billion years ago. New data from the ongoing Extended Baryon Oscillation Spectroscopic Survey (eBOSS) of SDSS-IV and the near-future surveys DESI and WEAVE will greatly enhance the precision of the BAO measurement over the next decade.
Speaker: Dr Michael Blomqvist (Laboratoire d'Astrophysique de Marseille) -
12:45
Cosmology with Type Ia supernovae: environmental effects 15m
Type Ia supernovae (SNe Ia) have proved to be a successful probe of dark energy thanks to their property of standardizable candle allowing us to construct a supernova Hubble diagram with very low scatter through a two-parameter empirical light-curve correction. However, 0.15 magnitude intrinsic luminosity variation remains once corrections are applied, leaving plenty of room for a third variable correlating to Hubble diagram residuals. Indeed, the standardization process does not entirely capture the physical processes at play leading to the triggering of the explosion, and does not take into account the evolution of progenitor properties through history. In an attempt to link host galaxy properties to supernova light-curves, numerous independent studies have shown that host galaxy stellar masses significantly correlate with light-curve standardization parameters, and that Hubble diagram residuals correlate to global properties of the host galaxy. I present a consistent set of measurements of the properties of the global and local environments of type Ia supernovae in the largest spectroscopic sample to date. Our sample includes the full Supernova Legacy Survey data (SNLS) as well as the SDSS data and a number of well-measured low-redshift supernovae. While the analysis is still blinded regarding cosmology, preliminary results can be obtained which cast a new light on the environmental dependence of supernova luminosity.
Speaker: Matthieu Roman (LPNHE Paris)
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Detectors and data handling Room Amici (Palazzo del Casinò)
Room Amici
Palazzo del Casinò
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09:00
The CMS HGCAL detector for HL-LHC upgrade 17m
The High Luminosity LHC (HL-LHC) will integrate 10 times more luminosity than the LHC, posing significant challenges for radiation tolerance and event pileup on detectors, especially for forward calorimetry, and hallmarks the issue for future colliders. As part of its HL-LHC upgrade program, the CMS collaboration is designing a High Granularity Calorimeter to replace the existing endcap calorimeters. It features unprecedented transverse and longitudinal segmentation for both electromagnetic (ECAL) and hadronic (HCAL) compartments. This will facilitate particle-flow calorimetry, where the fine structure of showers can be measured and used to enhance pileup rejection and particle identification, whilst still achieving good energy resolution. The ECAL and a large fraction of HCAL will be based on hexagonal silicon sensors of 0.5 - 1 cm^2 cell size, with the remainder of the HCAL based on highly-segmented scintillators with SiPM readout. The intrinsic high-precision timing capabilities of the silicon sensors will add an extra dimension to event reconstruction, especially in terms of pileup rejection. An overview of the HGCAL project is presented, covering motivation, engineering design, readout and trigger concepts, and performance (simulated and from beam tests).
Speaker: Arnaud Steen (National Taiwan University (TW)) -
09:17
The CMS ECAL Upgrade for Precision Crystal Calorimetry at the HL-LHC 17m
The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) is operating at the Large Hadron Collider (LHC) with proton-proton collisions at 13 TeV center-of-mass energy and at a bunch spacing of 25 ns. Challenging running conditions for CMS are expected after the High-Luminosity upgrade of the LHC (HL-LHC). We review the design and R&D studies for the CMS ECAL crystal calorimeter upgrade and present first test beam studies. Particular challenges at HL-LHC are the harsh radiation environment, the increasing data rates and the extreme level of pile-up events, with up to 200 simultaneous proton-proton collisions. Precision timing can be exploited to reduce the effect of the pile-up. We report about the timing resolution studies performed with test-beams. We also report on the R&D for the new readout and trigger electronics, which must be upgraded due to the increased trigger and latency requirements at the HL-LHC.
Speaker: Nancy Marinelli (University of Notre Dame (US)) -
09:34
ATLAS Calorimeter: Run-2 performance and Phase-II upgrade 17m
The ATLAS detector was designed and built to study proton-proton collisions produced at the LHC at centre-of-mass energies up to 14 TeV and instantaneous luminosities up to $10^{34} \mathrm{cm}^{-2} \mathrm{s}^{-1}$. A liquid argon (LAr)-lead sampling calorimeter is employed as electromagnetic calorimeter and hadronic calorimeter, except in the barrel region, where a scintillator-steel sampling calorimeter (TileCal) is used as hadronic calorimeter.
This presentation will give first an overview of the detector operation and data quality, as well as the achieved performance of the ATLAS calorimetry system. Additionally, the upgrade projects of the ATLAS calorimeter system for the high luminosity phase of the LHC (HL-LHC) will be presented. For the HL-LHC, the instantaneous luminosity is expected to increase up to $\mathrm{L} \simeq 7.5 \times 10^{34} \mathrm{cm}^{-2} \mathrm{s}^{-1}$ and the average pile-up up to 200 interactions per bunch crossing.The major R&D item is the upgrade of the electronics for both LAr and Tile calorimeters in order to cope with longer latencies of up to 60 us. The expected radiation doses will exceed the qualification range of the current readout system. The status on the R&D of the low-power ASICs (pre-amplifier, shaper, ADC, serializer and transmitters) and readout electronics for all the design options will be discussed.
Moreover, a High Granularity Timing Detector (HGTD) is proposed to be added in front of the LAr calorimeters in the end-cap region (2.4 <|$\eta$|< 4.2) for pile-up mitigation at Level-0 trigger level and offline reconstruction. The HGTD will correlate the the energy deposits in the calorimeter to different proton-proton collision vertices by using TOF information with high time resolution (30 pico-second per readout cell) based on the Silicon sensor technologies. The current test beam results will be presented as well.
Speaker: Djamel Eddine Boumediene (Univ. Blaise Pascal Clermont-Fe. II (FR)) -
09:51
The LHCb RICH Detector Upgrade 17m
LHCb is one of the four main experiments at the Large Hadron Collider (LHC) at CERN, focused on the study of CP violation and rare decays of b and c quarks. The Ring-Imaging Cherenkov (RICH) system is a crucial component of the LHCb experiment providing identification of charged particles over a large momentum range (2-100 GeV/c) and angular acceptance (15-300 mrad). The LHCb RICH performed extremely well during Run 1 and the current Run2. LHCb will upgrade many of its detector systems during the second LHC long shutdown (2019-2020) in order to sustain a five-fold increase in instantaneous luminosity up to 2$\times$10$^{33}$ cm$^{-2}$s$^{-1}$. In order to reach the planned 40 MHz continuous data taking, a substantial change in the LHCb trigger and read-out schemes will be implemented. The RICH detectors will be upgraded by installing new photo-detectors, electronics and modified optics and mechanics. The status of the RICH upgrade program will be reviewed, including tests of the complete photo-electronic chain in the lab and in dedicated test-beams.
Speaker: Massimiliano Fiorini (Universita di Ferrara & INFN (IT)) -
10:08
Low radioactivity Argon and SiPM at cryogenic temperatures for the next generation dark matter searches 17m
DarkSide-20k is a proposed 20 tonne fiducial mass liquid argon TPC that will perform an instrumental background-free search for WIMP dark matter. The TPC will be outfitted with more than 125,000 silicon photomultipliers (SiPM) grouped into 5210 single-channel, $25\ {\rm cm}^2$ photosensors that are sensitive to single photoelectrons, and will be filled with low radioactivity Argon extracted from underground CO$_2$ wells in Cortez, Colorado in the US.
We will present the performance of the photosensor and associated low-noise electronics at liquid argon temperature and discuss the strategy for scaling up production for DarkSide-20k as well as an overview of the Urania and Aria projects which aim to extract and purify 100 kg/day of underground Argon for use in Darkside-20k.Speaker: Dr Walter Marcello Bonivento (INFN Cagliari) -
10:25
CaloCube: a new homogenous calorimeter with high-granularity for precise measurements of for high-energy cosmic rays in space. 17m
The direct observation of high-energy cosmic rays, up to the PeV region, will depend on highly performing calorimeters, and the physics performance will be primarily determined by their geometrical acceptance and energy resolution.Thus, it is fundamental to optimize their geometrical design, granularity, and absorption depth,with respect to the total mass of the apparatus, probably the most important constraints for a space mission.
Furthermore a calorimeter based space experiment can provide not only flux measurements, but also energy spectra and particle identification to overcome some of the limitations of ground based experiments.
Calocube is a homogeneous calorimeter whose basic geometry is cubic and isotropic, so as to detect particles arriving from every direction in space, thus maximizing the acceptance; granularity is obtained by filling the cubic volume with small cubic scintillating crystals.
A prototype, instrumented with CsI(Tl) cubic crystals, has been constructed and tested with particle beams. An overview of the obtained results will be presented and the perspectives for future space experiments will be discussed.Speaker: Dr Gabriele Bigongiari (INFN-Pisa) -
10:42
Development and characterization of near-UV sensitive Silicon Photomultipliers for the Schwarzschild-Couder Telescope prototype for the CTA collaboration 17m
Silicon Photomultipliers (SiPM) are standard sensors widely employed for applications in which high sensitivities and fast responses in the detection of low fluxes of visible and UV photons are required.
The Italian Institute of Nuclear Physics (INFN), in collaboration with Fondazione Bruno Kessler (FBK), is involved in a R&D project for SiPM sensors sensitive to near UV wavelengths.
The performances of the latest technology of NUV-High-Density SiPM have confirmed that the quality of the current production technology opens the possibility to employ these devices for many applications.
In this contribution, we review the performances of the latest technology of NUV-High-Density SiPM and the prospects for their use in one of the designs of the camera focal planes of Schwarzschild-Couder Telescope prototype, including the development of packaging procedures of single sensors into high-density multi-SiPM modules and the development of a custom front-end ASIC for a high rate waveform sampling of the SiPM signals.Speaker: Emanuele Fiandrini (Universita e INFN, Perugia (IT)) -
11:00
Coffee break 30m
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Tracking in 4 dimensions 20m
In this contribution we will present the progresses toward the construction of a silicon tracking system able to measure the passage of charged particles with a combined precision of ∼ 10 ps and ∼ 10 μm, either using a single type of sensor, able to concurrently measure position and time, or a combination of position and time sensors.
The recent development of controlled multiplications in Low-Gain Avalanche Detectors (LGAD) has opened up the possibility of manufacturing silicon detectors with signal larger than that of traditional sensors, but with still very low noise, therefore enabling precision time measurements. The basic mechanism of LGAD is to obtain charge multiplication within the bulk of a silicon sensor by adding a thin multiplication layer just underneath the p-n junction.
The inclusion of timing information in the structure of a recorded event has the capability of changing the way we design experiments, as this added dimension dramatically improves the reconstruction process. Depending on the type of sensors that will be used, timing information can be available at different stages in the reconstruction of an event, for example (i) at tracking reconstruction, if timing is associated to each point or (ii) during the event reconstruction, if timing information is associated to each track.
We will first review the current LGAD manufacturing schemes, the results obtained at beam tests, than the mitigation techniques implemented to built radiation hard LGAD sensors, and finally how 4D tracking is being included in future experiments and its impact in the reconstruction of physics quantities. We will also present the research and development of the LGAD read-out electronics, showing the current best limits and reviewing the possible technological choices currently developed.
Speaker: Nicolo Cartiglia (INFN Torino) -
11:50
Diamond Detector Technology: Status and Perspectives 20m
At present most experiments at the CERN Large Hadron Collider (LHC)
are planning upgrades in the next 5-10 years for their innermost
tracking layers as well as luminosity monitors to be able to take data
as the luminosity increases and CERN moves toward the High Luminosity-LHC
(HL-LHC). These upgrades will most likely require more radiation
tolerant technologies than exist today. As a result this is one area of
intense research. Chemical Vapor Deposition (CVD) diamond has been
used extensively and successfully in beam conditions/beam loss monitors
as the innermost detectors in the highest radiation areas of essentially
all LHC experiments. The startup of the LHC in 2015 brought a new
milestone where the first diamond pixel modules were installed in an LHC
experiment (ATLAS) and successfully began taking data. As a result,
this material is now being discussed as a possible sensor material
for tracking very close to the interaction region and for pixelated
beam conditions/beam loss monitors of the LHC/HL-LHC upgrades where
the most extreme radiation conditions will exist.The RD42 collaboration at CERN is leading the effort to use CVD diamond
as a material for tracking detectors operating in extreme radiation
environments. During the last three years the RD42 group has succeeded
in producing and measuring a number of devices to address specfic issues
related to use at the HL-LHC. We will present status of the RD42 project with
emphasis on recent beam test results. In particular we present the latest
results on material development, the most recent results on the independence
of signal size on incident particle rate in poly-crystalline CVD
diamond pad and pixel detectors over a range of particle fluxes up to
20 MHz/cm^2 measured, and results from first 3D diamond detectors which
produce an extremely radiation tolerant device and collect nearly all of
the charge deposited in the material. In addition we will present the plans
for future use of the most recent devicesSpeaker: Michael Philipp Reichmann (Eidgenoessische Technische Hochschule Zuerich (CH)) -
12:10
Development of a thin-wall straw-tube tracker for COMET experiment 16m
The COMET experiment at J-PARC aims to search for the charged lepton flavor violating process of neutrinoless muon to electron conversion with an improvement of a sensitivity by a factor of 10000 to the current limit, in order to explore the parameter region predicted by most of well-motivated theoretical models beyond the Standard Model. When the muon to electron conversion occurs, almost all the energy of the muon mass is carried out by the electron which is expected to have the monochromatic energy of about 105 MeV. The experiment requires to detect such electron with an excellent momentum resolution, better than 200 keV/c, in order to achieve the goal sensitivity. Thus the very light material detector which is operational in vacuum is indispensable. On the basis of the requirement, we have developed the thin-wall straw-tube tracker which is operational in the vacuum and constructed by the extremely light material. The prototype straw-tube tracker has been developed, which consists of 9.8 mm diameter tube, longer than 1 m length, with 20 $\mu$m thickness Mylar foil and 70 nm aluminum deposition, and its performance evaluation using radioactive source, cosmic ray, and electron beam has been performed. In this presentation, we report the detail of the performance evaluation of the prototype tracker. The prospect of final detector design is also described.
Speaker: Kazuki Ueno (KEK) -
12:26
Radiation studies on resistive bulk-micromegas chambers at the CERN Gamma Irradiation Facility 16m
With the growing diffusion of resistive Micromegas detectors in HEP experiments the study of long-term aging behaviour is becoming more and more relevant.
Two resistive bulk-Micromegas detectors were installed in May 2015 at the CERN Gamma Irradiation Facility exposed to an intense gamma irradiation with the aim to study the detector behavior under high irradiation and the long-term aging.
The detectors have an active area of 10x10 $^2$, readout strip pitch of 400 $\mu$m, amplification gap of 128 $\mu$m and drift gap of 5 mm.The desired accumulated charge of more than 0.2 C/cm$^2$ has been reached for one of the chambers, equivalent to 10 years of HL-LHC operation. The efficiency, amplification, and resolution of the Micromegas after this long-term irradiation period will be compared with the performance of a non irradiated detector.
In addition, the latest results of the measured particle rate as a function of the amplification voltage will be presented and compared with those obtained in 2015.
Speaker: Barbara Alvarez Gonzalez (CERN) -
12:42
Measurement of shower development and its Molière radius with a four-plane LumiCal test set-up 16m
A prototype of a luminometer, designed for a future e+e− collider detector, and consisting at present of a four-plane module, was tested in the CERN PS accelerator T9 beam. The objective of this beam test was to demonstrate a multi-plane operation, to study the development of the electromagnetic shower and to compare it with MC simulations. In addition, the effective Molière radius of this configuration is extracted.
Speaker: Itamar Levy (Tel Aviv University (IL))
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Dark matter Room Mosaici-2 (Palazzo del Casinò)
Room Mosaici-2
Palazzo del Casinò
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Indirect Detection Experiments 30m
We live in a golden age for astro-particle physics, with a significant number of experiments actively monitoring high-energy Universe. Many of these probes provide excellent tests of particle physics models of dark matter particles. In particular, experiments such as Fermi -LAT, AMS-02, Ice Cube, ... are significantly cutting into the parameter space of one of the most popular candidates, the WIMPs. In this talk I will describe some of the strategies and methods used to search for dark matter with astrophysical data. Special attention will be given to the latest indications of an unaccounted gamma-ray excess at few GeV in the Fermi-LAT data in the region around the Galactic Centre, which steered lots of attention as it was shown to be consistent with putative signals of WIMP dark matter particles and complementary constraints provided by other experiments. Finally I will discuss projections of the expected sensitivities with upcoming experiments and continued data taking with current ones.
Speaker: Dr Gabrijela Zaharijas (University of Nova Gorica) -
09:30
Looking for New Physics in the Satellites of the Milky Way 15m
Sitting at the faint end of the galaxy luminosity function, dwarf spheroidal galaxies of the Milky Way are among the most compelling targets for Dark Matter indirect searches, being characterized by large mass-to-light ratios and small baryonic background and foreground. In this talk we review the assumptions at the basis of the estimate of the Dark Matter content in these galaxies as extensively studied in the literature. Then, we present a novel method in order to conservatively assess the impact of the mass-anisotropy degeneracy plaguing the outcome of these indirect Dark Matter searches. This new approach is based on the inversion of the spherical Jeans equation (arXiv:1603.07721). Going beyond the standard Cold Dark Matter paradigm, we eventually comment on the unique opportunity these galaxies offer to us in the quest for the fundamental nature of Dark Matter.
Speaker: Mauro Valli (INFN Rome) -
09:45
Dark Matter signal from e+ / e- / p- with the AMS Detector on the International Space Station 15m
The excess of the antiproton flux and the antiproton-to-proton flux ratio beyond the prediction of the collision of ordinary cosmic rays is a unique signal from the Dark Matter model of neutralino annihilation. This excess can not come from pulsars. We present precision measurements by AMS of the antiproton flux and the antiproton-to-proton flux ratio in the absolute rigidity range from 1 to 450 GV based on 3.49 x 10$^5$ antiproton events and 2.42 x 10$^9$ proton events. Comparison of our results with neutralino annihilation model shows good agreement. Comparison with other astrophysics models will also be presented.
We also present the latest results on 20 million electron and positron events measured by the Alpha Magnetic Spectrometer on the International Space Station. The measurement covers the energy range up to 1000 GeV. The measured positron flux and the positron fraction are in agreement with the Dark Matter Model with a neutralino mass of ~1 TeV. Comparison of the measurement with other astrophysics models will also be presented. In addition the precision measurement of the combined electron and positron flux exhibit no structures and positron arrival directions are consistent with isotropy, in agreement with the Dark Matter models.
Speaker: Nikolas Zimmermann (Rheinisch-Westfaelische Tech. Hoch. (DE)) -
10:00
Probing dark matter annihilation in the Galaxy with antiprotons and gamma rays 15m
We analyze cosmic-ray antiproton observations in the light of dark matter (DM) annihilation in our Galaxy using the recent precise AMS-02 measurements. Taking into account cosmic-ray propagation uncertainties by fitting at the same time DM and propagation parameters we find a significant indication of a DM signal for various annihilation channels in the mass range between 40 and 130 GeV and with an annihilation cross-section close to the thermal value. Intriguingly, this signal is compatible with the DM interpretation of the Galactic center gamma-ray excess and recent observation of dwarf satellite galaxies as we will demonstrate by perform a joint fit of the antiproton and gamma-ray data. As an example, we interpret our results in the Higgs Portal model.
Speaker: Jan Heisig (RWTH Aachen University) -
10:15
Searches for low-mass new-physics states with the BaBar detector 15m
We report on the most recent searches for unknown low-mass states performed with the data collected by the BaBar detector at the PEP-II e+e- collider.
The first search is based on a sample corresponding to 53 fb−1 of e+e− collision data collected with a special single-photon trigger. We look for events with a single high-energy photon and a large missing momentum and energy, consistent with production of a spin-1 particle A′ through the process e+e−→γA′, A′→invisible. Such particles, referred to as “dark photons”, are motivated by theories applying a U(1) gauge symmetry to dark matter. We find no evidence for such processes and set 90\% confidence level upper limits on the coupling strength of A′→e+e− for a dark photon with a mass lower than 8 GeV. In particular, our limits exclude the values of the A′ coupling suggested by the dark-photon interpretation of the muon (g-2) anomaly, as well as a broad range of parameters.
Many models of New Physics postulate the existence of new gauge bosons mediating interactions between “dark sectors” and the Standard Model. We present a second search for a dark boson Z′ coupling only to the second and third generation of leptons in the reaction e+e−→μ+μ−Z′, Z′→μ+μ− with the full BaBar dataset. No significant signal is observed and limits improving upon bounds derived from neutrino experiments are set.Speaker: Nicolas Arnaud (LAL (CNRS-IN2P3)) -
10:30
CMB bounds on primordial black holes 15m
I will describe the physical mechanisms and the actual bounds that CMB anisotropy studies put on primordial black holes, notably if they constitute a sizable fraction of dark matter. Both mass-independent gravitational effects (linked to mergers) and mass-dependent ones (due to electromagnetic energy injection) will be covered. I will also briefly comment on the complementarity of other cosmological bounds (primordial nucleosynthesis, large scale structures, CMB spectral distortions) and on some future prospects.
Speakers: Pasquale Dario Serpico (LAPTh - CNRS & Univ. de Savoie (France)), Pasquale Serpico (LAPTh - CNRS & Univ. Savoie (FR)), Pasquale Serpico (LAPTH, Annecy-le-vieux) -
10:45
Directional detection of Dark Matter with nuclear emulsion based detector 15m
Direct dark matter searches are promising techniques to identify the nature of dark matter particles. A variety of experiments have been developed over the past decades, aiming to detect Weakly Interactive Massive Particles (WIMPs) via their scattering in a detector medium. Exploiting directionality would also give a proof of the galactic origin of dark matter making it possible to have a clear and unambiguous signal to background separation. The directional detection of Dark Matter requires very sensitive experiment combined with highly performant technology. The NEWSdm experiment, based on nuclear emulsions, is proposed to measure the direction of WIMP-induced nuclear recoils. We discuss the potentiality, both in terms of exclusion limits and potential discovery, of a directional experiment based on the use of a solid target made by newly developed nuclear emulsions and read-out systems reaching sub-micrometric resolution.
Speakers: Nicola D'Ambrosio (Laboratori Nazionali del Gran Sasso (IT)), Nicola D'Ambrosio (INFN) -
11:00
Coffee break 30m
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CYGNUS: development of a high resolution TPC for rare events 15m
In this presentation the R&D of a gas detector prototype for high precision tracking of low energy nuclear recoils over large gas volumes will be presented.
In our prototype, the scintillation light accompanying the electronic avalanches in a triple GEM structure is detected by a CMOS-based camera through a suitable lens. The CMOS sensors provide a very high granularity along with a very low noise (of the order of a single photon) and a very high sensitivity (70% of quantum efficiency).
Once operated with a large aperture and suitable focal length lens, large areas can be imaged at reduced costs.
Moreover, the optical approach is attempted in presence of a
highly electronegative gas suitable for negative ion drift (SF6 and its admixtures). An additional innovative element is the concurrent readout of the light by means of a suitable photomultiplier system. It will complement the readout by providing the time resolution necessary to separate, for fiducialization purposes, the contributions of the different charge carriers within the same nuclear recoil ionization cluster.Recent tests on beam demonstrated the achievement of resolutions of the order on tens of μm in the XY plane and hundreds of μm in Z and the feasibility, for the first time ever, of the Negative Ion Drift mechanism at ambient pressure with a very small amount of SF6 percentage.
The idea is to use such a detector in future large scale experiments for directional Dark Matter searches and for measurements of coherent neutrino scattering on nuclei.
Additional applications of this detector might be in the realm of neutron detection, X-ray polarimetry and particle therapy.
Speaker: Davide Pinci (Sapienza Universita e INFN, Roma I (IT)) -
11:45
Cosinus - Cryogenic Dark Matter searches with NaI crystals 15m
Cosinus is a R&D project aiming for the cryogenic operation of NaI-crystals to search for elastic dark matter scattering. NaI-crystals are scintillating and
the combined measurement of the scintillation light and the phonon signal allows a precise measurement of the deposited energy and a good separation between signal and background events. However, NaI is hygroscopic and requires a special treatment during the construction of the modules. In addition, the scintillation properties of NaI at cryogenic temperatures have not been measured yet. First results and future plans for operating a NaI crystals at cryogenic temperatures will be present. A dark matter direct detection experiment with NaI crystals operating at cryogenic temperatures would provide additional information for the understanding of the dark-mater claim by the DAMA/LIBRA collaboration.Speaker: Jochen Schieck (Austrian Academy of Sciences (AT)) -
12:00
DARWIN: towards the ultimate dark matter detector 15m
DARWIN (DARk matter WImp search with liquid xenoN) will be an experiment
for the direct detection of dark matter using a multi-ton liquid xenon time projection chamber. The first goal of Darwin will be to look for Weakly Interacting Massive Particles (WIMPs) pushing the sensitivity until the background of natural sources of neutrinos will be the dominant background. DARWIN's excellent sensitivity will allow to search for solar axions, galactic axion-like particles and the neutrinoless double-beta decay of $^{136}Xe$. It will also measure the low-energy solar neutrino flux with <1% precision, observe coherent neutrino-nucleus interactions, and be an excellent observatory for galactic supernovae. I will present DARWIN's detector concept, discuss its physics reach, main sources of background and current activities.Speaker: Prof. Francesco Arneodo (New York University Abu Dhabi) -
12:15
Axion experimental review 30m
Proposed more than 30 years ago, axions are still the most compelling solution to the strong CP problem of the Standard Model. More recently their physics case has been considerably sharpened, as well as that of similar axion-like particles (ALPs) that generically emerge in diverse high-energy extensions of the Standard Model, notably string theory. Both axion and ALPs constitute very appealing candidates to the dark matter of the Universe, and they are also invoked as a solution of a number of anomalous astrophysical observations. In addition, particular realizations of these type of models appear linked with inflation, dark radiation and even dark energy. These developments, together with the fact that experimental techniques have recently achieved sensitivity to relevant regions of ALP parameter space, are increasing the interest in the search for these particles. I will review the status of the experimental landscape, as well as near term prospect from ongoing experiments, future projects and new detection ideas in the search for laboratory, dark matter and solar axions and ALPs.
Speaker: Igor Garcia Irastorza (Universidad de Zaragoza (ES)) -
12:45
Possible resonance effect of dark matter axions in SNS Josephson junctions 15m
Dark matter axions can generate peculiar effects in special types of Josephson junctions, so-called SNS junctions [1]. One can show that the axion field equations in a Josephson environment allow for very small oscillating supercurrents, which manifest themselves as a tiny wiggle in the I-V curve, a so-called Shapiro step, which occurs at a frequency given by the axion mass. The effect is very small but perfectly measurable in modern nanotechnological devices. In this talk I will summarize the theory and then present evidence that candidate Shapiro steps of this type have indeed been seen in several independent experiments [2]. Assuming the observed tiny Shapiro steps are due to axion flow then these data consistently point to an axion mass of about 110 $\mu$eV, consistent with what is expected for the QCD axion. In addition to the above small Shapiro resonance effects at frequencies in the GHz region one also expects to see broad-band noise effects at much lower frequencies [3]. Overall this approach provides a novel pathway for the future design of new types of axionic dark matter detectors.
[1] C. Beck, Possible resonance effect of axionic dark matter in Josephson junctions, Phys. Rev. Lett. 111, 231801 (2013)
[2] C. Beck, Axion mass estimates from resonant Josephson junctions, Phys. Dark Univ. 7-8, 6-11 (2015)
[3] C. Beck, Cosmological flux noise and measured noise power spectra in SQUIDs,
Scient. Rep. 6, 28275 (2016)Speaker: Prof. Christian Beck (Queen Mary, University of London)
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Higgs and new physics: Exotics Room Welles (Palazzo del Casinò)
Room Welles
Palazzo del Casinò
Convener: Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))-
09:00
Implications of Vector Boson Scattering Unitarity in Composite Higgs Models 15m
The strong nature of Composite Higgs models manifests at high energies through the growing behavior of the scattering amplitudes of longitudinally polarized weak bosons that leads to the formation of composite resonances as well as non resonant strong effects. In this work, the unitarity of these scattering amplitudes, computed on the framework of chiral perturbation theory, is used as tool to assess the profile of composite spectrum of the theory, including non-resonant behavior, vector resonances, and specially the CP-even scalar excitation, which is only poorly described by lattice calculations. These three signatures are then studied in realistic scattering processes at colliders, aiming to estimate the potential to exclude natural dynamically motivated scenarios of Composite Higgs models. This work is based on arXiv:1605.0136 and a follow up paper which will be submitted in the next weeks.
Speaker: Diogo Buarque Franzosi (Universita e INFN Torino (IT)) -
09:15
Search for New Phenomena in Dijet Events with the ATLAS Detector at √s = 13 TeV 15m
During the last two years the LHC produced pp collisions at the record center-of-mass energy of 13 TeV. The sensitivity of searches for new phenomena with a high mass scale greatly benefited from the energy increase with respect to the LHC run-1 data. Events with two hadronic jets in the final state are of particular interest: new phenomena produced in parton collisions are likely to produce final states with (at least) two partons. In this talk several searches performed by the ATLAS collaboration are presented. The very high mass and the low mass regions have both been investigated, by exploiting dedicated signatures and, in case of the latter, new techniques to overcome trigger limitations. Results and perspectives for these searches will be presented.
Speaker: Attilio Picazio (University of Massachusetts) -
09:30
Searches for new physics in dijet and multijet final states 15m
Results of searches for new physics in the dijet and multijet final states are presented. These include model-independent and model-specific searches using the dijet invariant mass spectrum and the dijet angular distributions, searches for black holes, quantum and microscopic, in multijet events, as well as searches for RPV SUSY in events with paired dijets. This talk focuses on the recent results obtained using data collected during the 2016 run.
Speaker: Federico Preiato (Sapienza Universita e INFN, Roma I (IT)) -
09:45
Search for contact interactions in inclusive ep scattering at HERA 15m
The high-precision HERA data are used to search for Beyond the Standard Model contributions to electron-quark scattering in the framework of eeqq contact interactions (CI). Combined measurements of the inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering are considered, corresponding to a luminosity of around 1 fb$^{-1}$. The analysis of the inclusive $ep$ data is based on the simultaneous fits of parton distribution functions together with contributions of CI couplings to $ep$ scattering. Results are presented for different CI scenarios and the resulting 95% CL limits on the CI mass scales extend up to the 10 TeV scale.
Speaker: Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE)) -
10:00
Low-mass di-muon searches with the LHCb detector 15m
A flexible trigger system, excellent vertex locator, invariant mass resolution and forward acceptance allow unique exotica measurements to be performed at LHC energies using data collected with the LHCb detector. A summary of results will be presented, focusing in searches involving low mass dimuon resonances, sensitive to a wide range of New Physics models.
Speaker: Christoph Michael Langenbruch (Rheinisch-Westfaelische Tech. Hoch. (DE)) -
10:15
Searches for non-resonant new phenomena in final states with leptons and photons 15m
Many new physics models, e.g., compositeness, see-saw, and extra dimensions models, are expected to manifest themselves in the final states with leptons and photons. This talk presents searches for new non-resonant phenomena in the final states that include leptons and photons, focusing on the recent results obtained using data collected during the 2016 run.
Speaker: Oscar Gonzalez Lopez (Centro de Investigaciones Energéti cas Medioambientales y Tecno) -
10:30
Searches for new phenomena in leptonic final states using the ATLAS detector 15m
Many theories beyond the Standard Model predict new phenomena which decay to well isolated, high-pt leptons. Searches for new physics models with these signatures are performed using the ATLAS experiment at the LHC. The results reported here use the pp collision data sample collected in 2015 and 2016 by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
Speaker: Giacomo Artoni (University of Oxford (GB)) -
10:45
Searches for new heavy resonances in final states with leptons and photons 15m
Numerous new physics models, e.g., theories with extra dimensions and various gauge-group extensions of the standard model, predict the existence of new particles decaying to leptons and photons. This talk presents CMS searches for new resonances in the dilepton, lepton+MET, diphoton, and other final states that include leptons and photons, focusing on the recent results obtained using data collected during the 2016 run.
Speaker: Benjamin Radburn-Smith (Seoul National University (KR)) -
11:00
Coffee break 30m
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Revealing BSM Composite Dynamics Through Topological Interactions at Future Colliders 15m
In composite Higgs models, new composite pseudo-scalars (as an $\eta$ or an $\eta^{\prime}$-like state) can interact with the Higgs and with gauge bosons via anomalous interactions, which stem from the topological structure of the theory. A future 100 TeV pp collider (FCC) will be able to test these anomalous interactions and thus to shed light on the strong dynamics which generates the Higgs and other composite resonances. I will discuss the topological interactions of a minimal composite Higgs model with fermionic ultraviolet completion, based on the coset SU(4)/Sp(4). I will indicate the strategy to test these interactions at the FCC and the expected reach.
Speaker: Natascia Vignaroli (CP3-Origins) -
11:45
The W and Z boson spin observables as messengers of New Physics at LHC 15m
New Physics searches at colliders are usually conceived as the search of excesses in the number of events at a certain kinematic region. We emphasize that, whenever the process under study is mediated by a non-scalar particle, the final-state angular distribution has extra information related to the spin state of the mediator. We apply this
idea to the W and Z bosons at LHC, showing that their eight spin observables carry precious information about their production mechanism which is able to discriminate new physics and standard models. The characterization of these spin properties, which is feasible at LHC from the angular distribution of the lepton channels in their decays, may thus act as a messenger from the hidden new physics process in the hadronic environment.
We find the polarisation and alignment analisers in the different terms of the leptonic angular distribution, providing the accessibility to the eight multipole parameters. Furthermore we establish a biunivocal
correspondence between these different spin properties of the vector boson and definite asymmetries or aplanarities.
The power of this analysis is well illustrated with several new physics production mechanisms, and their comparison with the standard model, for processes such as:(i) W production from polarised top quark decays;
(ii) W and Z bosons originating from the two-body decay of
a heavy resonance; (iii) Z production plus jets;
(iv) Z boson plus missing transverse energy.Speaker: Prof. José Bernabeu (IFIC) -
12:00
Electroweak resonances in HEFT 15m
Due to the gap between the known 100 GeV scale and new physics if any, it is natural to employ an effective one-loop Lagrangian (HEFT) for the particles of the Electroweak Symmetry Breaking Sector (WL,ZL and h). To describe any new particles and resonances that may be found at the LHC we employ its unitarized amplitudes, valid even in the presence of new strong interactions. We have assessed the systematics by comparing several such methods, and find that they give qualitatively similar results and succesfully produce unitary amplitudes in the nonperturbative regime. We are thus in a position to describe new physics in the 0.5 TeV-3 TeV (region of validity of our approximations: the effective theory and the equivalence theorem to substitute WL, ZL by the Goldstone bosons of electroweak symmetry breaking). We have also computed the coupling of the EWSBS to the top-antitop and two-photon channels to describe resonances that decay through them or to study their photon-photon production, for example. The approach is universal and useful for many BSM theories at low energy.
Speaker: Antonio Dobado -
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Limits on Torsion parameters from ttbar production at LHC 15m
Torsion models constitute a well known class of extended quantum gravity models. In this work, one investigates phenomenological consequences of a torsion field interacting in different ways with top quarks at LHC. A torsion field could appear as a new heavy state characterized by its mass and couplings to fermions. This new state would form a resonance decaying into a top anti-top pair. The latest ATLAS results with 13 TeV data are used to set limits on torsion parameters.
The integrated luminosity needed to observe torsion resonance at the next LHC upgrades are also evaluated, considering different values for the torsion mass and its couplings to Standard Model fermions. Finally, prospects for torsion exclusion at the future LHC phase II and phase III are obtained.Speaker: Andre Nepomuceno (Universidade Federal Fluminense) -
12:30
Limits on the effective quark radius from inclusive ep scattering at HERA 15m
The high precision HERA combined measurement of inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering, corresponding to a luminosity of about 1 fb$^{-1}$, permits searches for new contributions to electron-quark scattering beyond the Standard Model up to TeV scales. A new approach to beyond the Standard Model analysis of the inclusive ep data is presented; simulataneous fits of parton distribution functions and contributions of "new physics" processes were performed. Results are presented considering a finite radius of quarks within the quark form-factor model. The resulting 95% C.L. upper limit on the effective quark radius is 0.43 x 10$^{-16}$ cm.
Speakers: Oleksii Turkot (DESY), Oleksii Turkot (Deutsches Elektronen-Synchrotron (DE)) -
12:45
BSM physics at energy-frontier lepton-hadron colliders 15m
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide electron-proton collisions with center-of-mass energies in the range 1.3-3.5 TeV and instantaneous luminosities larger than $10^{34}$ cm$^{-2}$s$^{-1}$. An overview is given and new results are presented on a variety of possible discovery channels such as exotic Higgs, RPV SUSY, sterile and right-handed neutrinos, and others. We also comment on the impact of the reduced uncertainties in proton parton densities and $\alpha_s$ that can be achieved through ep for searches for new physics at the HL-LHC (pp).
Speaker: Kechen Wang (DESY / IHEP)
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Higgs and new physics: Higgs Sala Perla (Palazzo del Casinò)
Sala Perla
Palazzo del Casinò
Conveners: Michael Duehrssen-Debling (CERN), Tamara Vazquez Schroeder (McGill University (CA))-
09:00
EFT probes of new physics 30m
I will explain various EFT approaches to learn about possible new physics lying beyond the SM. Particular emphasis will be put on EWSB physics and operators that break EW symmetry beyond the SM.
Speaker: Joan Elias Miro (SISSA) -
09:30
Measurement of the Higgs boson differential and fiducial cross sections at CMS 15m
After the discovery of a Higgs boson, it is of great importance to study its properties under a minimal set of assumptions. The definition of a fiducial phase-space for the measurement of cross sections allows to minimise uncertainties due to extrapolations and to model dependence. A measurement of the Higgs boson differential fiducial cross sections is performed in several final states, including diphoton and ZZ channels, using 36/fb of pp collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the LHC. The fiducial cross sections are measured as a function of kinematic observables characterising the production mechanism of the Higgs boson. A review of the analysis strategy and event categorisation will be provided and the most recent results will be shown.
Speaker: Vittorio Raoul Tavolaro (Eidgenoessische Technische Hochschule Zuerich (CH)) -
09:45
Measurement of fiducial and differential cross sections of the SM Higgs boson in the diphoton and 4l decay channels using the ATLAS detector 15m
The latest results on the measurement of the fiducial and differential cross sections of the Higgs boson in the diphoton and 4l decay channels with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
Speaker: Andrea Gabrielli (Lawrence Berkeley National Lab. (US)) -
10:00
Higgs decay into four leptons in the presence of dimension–six operators 15m
We study the effects of dimension-six operators on the Higgs decay into
four lepton channel. The calculation of new matrix elements has been
performed in the so-called Higgs basis and it is
implemented in a Monte Carlo event generator.
A mapping between the parameters of the phenomenological Lagrangian
and those of the Warsaw and SILH bases is also implemented.
We consider all the relevant operators, both the CP-even and CP-odd
operators, which contribute to this decay channel. Choosing suitable benchmark
values for some relevant Wilson coefficients, we compare our predictions
for partial decay width and some important kinematic distributions with
the NLO (EW) SM predictions. A paper, collecting our results, has been recently published (arXiv:1703.06667) and will be submitted to an international peer-reviewed journal in the forthcoming days.Speaker: Dr Stefano Boselli (INFN, Sez. di Pavia) -
10:15
Searches for HH production at 13 TeV with the CMS detector 15m
The production of a pair of Higgs bosons provides a direct handle on the structure of the Higgs field potential. While the HH production within the SM is very small and essentially out of the experimental reach within the LHC Run II, several beyond SM theories foresee an enhancement that can be already probed with the available data. The latest searches for resonant and non-resonant Higgs pair production made using CMS Run II data are presented considering different decay modes of the Higgs boson.
Speaker: Martino Dall'Osso (Universita e INFN, Padova (IT)) -
10:30
Search for di-Higgs production with the ATLAS detector 15m
An enhanced production of two Higgs bosons would be a clear sign of beyond Standard Model physics. A search is performed for resonant and non-resonant excess production, including several decay channels of the two Higgs bosons. The analysis uses about 36 fb-1 of p-p collisions at 13 TeV.
Speaker: Will Davey (University of Bonn (DE)) -
10:45
Probing the Higgs trilinear self-coupling via single Higgs production and precision physics. 15m
In the Standard Model of the Electroweak Interactions the value of the
Higgs trilinear self-coupling is predicted from its relation to the
Higgs mass and the Fermi constant. However, the experimental
verification of this prediction through the measurement of the double
Higgs production is extremely challenging.
I present the possibility of probing an anomalous trilinear coupling
indirectly, through its effects in the single Higgs production and
decay processes at the LHC and in the precision observables. Indeed, although
these processes do not depend on this coupling at the tree level, they
are sensitive to the Higgs self-coupling via loop effect. The
constraints on the trilinear Higgs self-coupling that can be obtained
from various observables, like the signal strength of the different
channels, the cross-section of the associate Higgs production with top
quarks and the measurement of the W mass, are presented.Speaker: Giuseppe Degrassi (Universita e INFN, Roma Tre (IT)) -
11:00
Coffee break 30m
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Improving predictions for associated t\bar{t}H production at the LHC: soft gluon resummation through NNLL accuracy 15m
Recent results on the resummation of soft gluon corrections to the $pp \rightarrow t \bar{t} H$ cross section at the LHC will be presented. The resummation was carried out at next-to-next-to-leading-logarithmic (NNLL) accuracy using the Mellin space technique and matched to the NLO cross section. The process probes directly the top-Higgs Yukawa coupling that may be particularly sensitive to physics beyond the Standard Model. The measurement of the $pp \rightarrow t \bar{t} H$ cross section is among the highest priorities of the current LHC physics program and therefore, improvement of the theoretical accuracy is of the central importance. We show that the resummation leads to reduction of scale-variation uncertainty of the total $pp \rightarrow t \bar{t} H$ cross section and three-particle invariant mass distributions.
Speaker: Tomasz Stebel (Jagiellonian University) -
11:45
Latest CMS results on Higgs boson production in association with top quarks 15m
Latest 13 TeV results of CMS searches regarding the Higgs boson production in association with top quarks will be presented. This talk will cover the different CMS analyses covering the main Higgs boson decay modes (gamma gamma, ZZ, WW, and tautau).
Speaker: Saranya Samik Ghosh (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)) -
12:00
Search for the SM Higgs boson in the ttH production channel using the ATLAS detector. 15m
The associated production of the Higgs boson with top quarks should allow the direct observation of the coupling of the Higgs boson to top quarks. The channel also benefits for a large cross-section increase between 8 and 13 TeV. ATLAS results in the search for the Higgs boson in the ttH production mode based on about 36fb-1 collected data will be presented.
Speaker: Judith Katzy (Deutsches Elektronen-Synchrotron (DE)) -
12:15
Latest CMS results on ttH(bb) production 15m
Latest 13 TeV results of CMS searches for the Higgs boson produced in association with top quarks and decaying to b quarks will be presented. This talk will include the first CMS results for the fully hadronic channel with the matrix element method as well as the semi-leptonic and di-leptonic channels with the matrix element method and BDT discriminant.
Speaker: Daniel Salerno (Universitaet Zuerich (CH)) -
12:30
Searches for associated production of the Higgs boson with a single top at 13 TeV at CMS 15m
The latest results of searches for the Standard Model Higgs boson produced in association with a single top quark (tHq, tHW) are presented. The analyses have been performed using the 13 TeV pp collisions data recorded by the CMS experiment in 2015 and 2016.
Speaker: Pallabi Das (Tata Inst. of Fundamental Research (IN)) -
12:45
Search for a new Higgs boson-like low-mass resonance in the diphoton final state in pp collisions in CMS 15m
We present the results of a CMS search for a new Higgs boson-like resonance decaying into two photons in proton-proton collisions. We search for an excess of events over the standard model background prediction in the diphoton invariant mass spectrum.
Speaker: Linda Finco (Universite Claude Bernard-Lyon I (FR))
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Heavy ion physics Room Mangano (Palazzo del Casinò)
Room Mangano
Palazzo del Casinò
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09:00
Creating QCD plasma droplets in p+p collisions at the LHC 30m
ATLAS, CMS and ALICE experiments have measured flow-like signatures in p+p collisions at 5.02 and 13 TeV that are reminiscent of those found in heavy-ion collisions. These signatures can naturally be explained as originating from tiny droplets of QCD plasma expanding hydrodynamically. I will review the applicability of hydrodynamics to plasma droplets below the femtometer scale and discuss possible implications for precision beyond-the-standard-model physics searches in p+p experiments.
Speaker: Paul Romatschke -
09:30
Measurements of multi-particle correlations and collective flow with the ATLAS detector 15m
The measurement of flow harmonics of charged particles from v_2 to v_7 in Pb+Pb collisions in the wide range of transverse momentum and pseudorapidity provides not only a way to study the initial state of the nuclear collisions and soft particle collective dynamics, but also provides insight into jet quenching via the measurement of flow harmonics at high transverse momenta. The longitudinal fluctuations of the v_n and event-plane angles Psi_n are also presented. The longitudinal flow decorrelations have contributions from v_n-magnitude fluctuations and event plane twist. A four-particle correlator is used to separate these two effects. Results show both effects have a linear dependence on pseudorapidity separation from v_2 to v_5, and show a small but measurable variation with collision energy. While collectivity is well established in collisions involving heavy nuclei, its evidence in pp collisions is less clear. In order to assess the collective nature of multi-particle production, the correlation measurements are extended to include azimuthal correlations measured using multi-particle cumulants. The measurements of multi-particle cumulants c_2{2–8} confirm the evidence for collective phenomena in p+Pb and low-multiplicity Pb+Pb collisions. For pp collisions, the measurements of cumulants do not yet provide clear evidence for collectivity as they are susceptible to event-by-event multiplicity fluctuations. A new modified cumulant method, which suppresses both the contribution of multiplicity fluctuations and non-flow effects, is used to address this issue.
Speaker: Tomasz Bold (AGH Univ. of Science and Technology, Krakow) -
09:45
Latest results on anisotropy flow of light and heavy flavors in PbPb collisions at CMS 15m
The $v_{2}$ and $v_{3}$ anisotropy harmonics of charged particles and prompt $D^{0}$ meson are measured at |y|$\le$ 1 as a function of transverse momentum ($p_{T}$) and centrality classes in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV collected with the CMS detector. The results indicate that the charm quarks interact strongly with the QGP medium. Comparisons between theoretical predictions and data provide new constraints on the interaction between charm quarks and the QGP medium. Additionally, nonlinear response coefficients of higher-order anisotropy harmonics for charged particles are measured in PbPb collisions at 2.76 and 5.02 TeV. It is performed by comparing the higher order $v_{n}$ measured with respect to their own plane with the mixed harmonics. The results are compared with hydrodynamic predictions with different shear viscosity to entropy density ratios and initial conditions.
Speakers: Jovan Milosevic (Vinca Institute of Nuclear Sciences (VINCA)), Jovan Milosevic (Physikalisches Institut), Jovan Milosevic (University of Belgrade (RS)), Jovan Milosevic (University of Belgrade (RS)) -
10:00
Charge correlations using balance functions of identified particles in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV with ALICE 15m
The two-wave quark production scenario can be investigated experimentally by measurements of balance functions of identified particle pairs [1]. By studying the balance functions of several hadronic species, one can gain insight into the chemical evolution of the QGP and radial flow. In a picture of early hadronization, pairs of particles and anti-particles (created at the same spacetime point) can separate further in rapidity due to the higher initial temperature and diffusive interactions with other particles. Therefore delayed hadronization will lead to strong correlations in rapidity in the final state. We present measurements of such balance functions based on an analysis of data acquired at the Large Hadron Collider (LHC) by the ALICE detector. Balance functions have been measured for identified charged-pion pairs in Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV. These balance functions are presented in relative rapidity $\Delta$y, relative pseudorapidity $\Delta\eta$, and relative azimuthal angle $\Delta\varphi$. We observe that the charged-pion balance function widths in $\Delta\eta$, $\Delta$y and $\Delta\varphi$ are narrower in central Pb-Pb collisions compared to peripheral collisions. In addition, a comparison between the balance functions of charged pions and unidentified charged particles will be shown. The findings in this analysis are consistent with the effects of delayed hadronization and radial flow, as well as the two-wave scenario.
[1] Pratt, Phys. Rev. C 85 (2012) 014904
Speaker: Sk Noor Alam (Department of Atomic Energy (IN)) -
10:15
Recent Results on Multi-Particle Azimuthal Correlations in High-Multiplicity pp and pPb Collisions in CMS 15m
In nucleus-nucleus collisions, the Quark-Gluon Plasma behaves like a perfect fluid and the azimuthal anisotropy of the observed particle final-state distributions reflects its properties. This anisotropic flow, arising mainly from initial-state geometry and its fluctuations, highlights the collective behavior of the particles produced in the collision. It is well-described by hydrodynamics and explains the long-range near-side correlations, known as the "ridge", observed experimentally in AA collisions and, more recently, in small systems such as pp or pA collisions. The CMS experiment has studied this correlation in details by extracting the momenta of the Fourier decomposition of azimuthal particle-distribution in the final state (vn, n=2—4). The vn are extracted using di-hadron correlation and multi-particle cumulant methods in both pp and pPb collisions. In this talk, results from CMS on the ridge in small systems are shown and compared with those in PbPb collisions, demonstrating that the collective nature of the ridge is present also in small systems. The correlation between different Fourier coefficients is further investigated using a symmetric cumulant analysis and compared across colliding systems. The latest results on vn correlations in pp at 13 TeV and pPb at 8.16 TeV collisions are also discussed. All these results give us a better understanding of collective effects from small to large colliding systems and provide more insights on the nature of the ridge in pp and pPb collisions.
Speaker: Cesar Bernardes (UNESP - Universidade Estadual Paulista (BR)) -
10:30
Angular correlations of identified particles in the STAR BES data 15m
The angular correlation function (CF) refers to the correlation of particles in the relative pseudorapidity and relative azimuthal angle. It is used to study strongly interacting matter properties at relativistic energies. Recent results from the ALICE experiment at LHC show unexpected structures of CF in the proton-proton and antiproton-antiproton correlations. Also results from the STAR experiment at RHIC on directed flow $(dv_1/dy)$ for the net-baryons are intriguing. Both observations are suggesting that study of CF of identified particles can provide more detailed insight into nuclear matter properties, in comparison with measurements of unidentified particles.
The STAR capability of identifying particles at mid rapidity, paired with the data from broad energy range of Au+Au collisions in the Beam Energy Scan program, provide unique opportunity to investigate the phase diagram of strongly interacting matter through the CF analysis. In this talk recent STAR experimental results from the Au+Au collisions at $\sqrt{s_{NN}} = (7.7−200) \; GeV$ from the RHIC’s Beam Energy Scan will be presented.
Speaker: Andrzej Lipiec (Warsaw University of Technology) -
10:45
New results on fluctuations and correlations from the NA61/SHINE experiment at the CERN SPS 15m
The exploration of the QCD phase diagram is the most important task of present heavy ion experiments. In particular, we want to study the phase transition from hadronic to partonic matter and look for the critical point (CP) of strongly interacting matter. Fluctuations and correlations in kinematic characteristics and particle yields may help to locate the CP (in analogy to enlarged fluctuations due to critical opalescence close to a CP in a liquid/gas transition). The strong interactions program of the NA61/SHINE experiment may allow to discover or rule out the existence of the CP in the SPS energy domain. For this purpose we perform a two-dimensional scan of the ($T-\mu_B$) phase diagram by varying the energy ($5.1 < \sqrt{s_{NN}} < 16.8/17.3$ GeV) and the system size (p+p, Be+Be, Ar+Sc, Xe+La, Pb+Pb) of the collisions.
In this presentation new NA61/SHINE results on fluctuations and correlations in p+p, Be+Be, and Ar+Sc collisions will be presented. In particular, results on transverse momentum and multiplicity fluctuations, as well as higher order moments of net-charge fluctuations will be discussed. Results on correlations in azimuthal angle and pseudorapidity will be also shown. The NA61/SHINE data will be compared to predictions of string hadronic models and to results from other experiments at the same energy range.
Speaker: Katarzyna Grebieszkow (Warsaw University of Technology (PL)) -
11:00
Coffee break 30m
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11:30
Chiral Magnetic Effect in the Dirac-Heisenberg-Wigner formalism 15m
The emergence of the Chiral Magnetic Effect (CME) and the related anomalous current is investigated using the real time Dirac-Heisenberg-Wigner formalism. This method is widely used for describing strong field physics and QED vacuum tunneling phenomena as well as pair-production in heavy-ion collisions. We extend earlier investigations of the CME in constant flux tube configuration by considering time dependent fields. In our model we can follow the formation of axial charge separation, formation of axial current and then the emergence of the anomalous electric current. Qualitative results are shown for special field configurations that help interpret the predictions of CME related effects in heavy-ion collisions in the RHIC Beam Energy Scan program.
Speaker: Peter Levai (MTA Wigner RCP) -
11:45
Broken boost invariance in the Glasma via finite nuclei thickness 15m
I present our work on simulating the Glasma in the early stages of heavy ion collisions in a non-boost-invariant setting. Our simulation is based on the colored particle-in-cell method, which is used to numerically solve the Yang-Mills equations in 3+1 dimensions. This approach allows us to describe colliding nuclei with finite longitudinal width by extending the McLerran-Venugopalan model to include a parameter for the Lorentz-contracted but finite extent of the nucleus in the beam direction. We determine the rapidity profile of the Glasma energy density, which shows strong deviations from the boost-invariant result. Varying the parameters both broad and narrow profiles can be produced. We find reasonable agreement when we compare the results to rapidity profiles of measured pion multiplicities from RHIC.
Speaker: David Mueller (Vienna University of Technology) -
12:00
Effective kinetic description of the early-time dynamics in heavy-ion collisions 15m
In the idealized high-energy limit of heavy-ion collisions, the system right after collisions is described as an over-occupied gluonic plasma expanding in the longitudinal direction, which is called Glasma. The understanding of the quark dynamics in such a pre-equilibrium state is of prime importance as it has a direct connection to electromagnetic probes such as photons. We report on a numerical study of the Boltzmann equation including two-to-two scatterings of gluons and quarks in a Glasma [1]. We find that quark distributions show self-similar scaling behavior like those of gluons. We also discuss the role of number-changing inelastic scatterings in the time evolution toward chemical equilibration between quarks and gluons.
[1] N. Tanji and R. Venugopalan, arXiv:1703.01372.
Speaker: Naoto Tanji (Heidelberg University) -
12:15
EPPS16 – First nuclear PDFs to include LHC data 15m
We show the results of our recent global analysis of EPPS16 NLO nuclear parton distribution functions (nPDFs). For the first time, dijet and heavy gauge boson production data from LHC proton–lead collisions have been included in a global fit. Especially, the CMS dijets play an important role in constraining the nuclear effects in gluon distributions. With the inclusion of also neutrino–nucleus deeply-inelastic scattering and pion–nucleus Drell–Yan data and proper treatment of isospin-corrected data, we were able to free the flavor dependence of the valence and sea quark nuclear modifications for the first time. This gives us less biased, yet larger, flavor by flavor uncertainty estimates. The EPPS16 analysis indicates no tension between the data sets used, which supports the validity of collinear factorization and universal nPDFs for nuclear hard-collision processes in the wide kinematical range studied.
Speaker: Mr Petja Paakkinen (University of Jyväskylä) -
12:30
Electroweak bosons in heavy-ion collisions measured with the ATLAS detector 15m
Electroweak bosons do not interact strongly with the dense and hot medium formed in nuclear collisions, and thus are sensitive to the nuclear modification of parton distribution functions (nPDFs). The ATLAS detector, optimised to search for new physics in proton-proton interactions, is well equipped to measure photons, W and Z bosons in the high occupancy environment produced in heavy-ion collisions. Results from the ATLAS experiment on photons, W, and Z boson yields in lead-lead and proton-lead collisions are presented. These results have particular importance in the context of understanding the collision geometry and nuclear initial state.
Speaker: Dennis Perepelitsa (University of Colorado Boulder) -
12:45
Measurements of multi-jet production in ultra-peripheral lead-lead collisions with the ATLAS detector 15m
Beams of relativistic heavy ions accompanied by a large flux of equivalent photons, and photon-induced reactions are the dominant interaction mechanism in heavy-ion collisions when the colliding nuclei have transverse separation larger that the nuclear diameter. In these ultra-peripheral collisions (UPC) the photon can provide a clean probe of the partonic structure of the nucleus analogous with deep inelastic scattering. This talk presents measurements of dijet production in ultra-peripheral Pb+Pb collisions performed with the ATLAS detector. Events are selected using requirements on rapidity gaps and forward neutron production to identify the photo-nuclear processes. The relatively clean environment of these events allows for measurements in a region of x and $Q^2$ where significant nuclear PDF modifications are expected to be present and not strongly constrained by previous measurements.
Speaker: Brian Cole (Columbia University (US))
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Neutrino physics Room Casinò (Palazzo del Casinò)
Room Casinò
Palazzo del Casinò
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09:00
Status of Light Sterile Neutrinos 30m
I review the experimental indications in favor of short-baseline
neutrino oscillations. I discuss their interpretation in the framework
of 3+1 neutrino mixing with a sterile neutrino at the eV scale. I
present the results of the updated 3+1 global fit including the recent
MINOS, IceCube and NEOS data. I discuss the implications for future
neutrino oscillations and neutrinoless double-beta decay experiments.Speaker: Carlo Giunti (INFN - National Institute for Nuclear Physics) -
09:30
A Search for Sterile Neutrinos with SoLid 15m
The SoLid experiment intends to search for active-to-sterile anti-neutrino oscillation at very short baseline and perform a precise measurement of the 235U anti-𝜈e spectrum at SCK•CEN BR2 in Belgium. A way to test this hypothesis is to look for distortions of the anti-neutrino energy caused by oscillation from active to sterile neutrino at several close stand-off distances ( ∼ 6-9m) from a compact reactor core. In addition the so-called “bump at 5 MeV”, can be tested at a almost pure U235 neutrino source with SoLid at SCK•CEN BR2 research reactor.
A novel approach to measuring reactor anti- neutrinos was developed based on an innovative sandwich of composite Polyvynil-Toluene and LiF:ZnS scintillators. High experimental sensitivity can be achieved with the combination of high granularity, high neutron-gamma discrimination using 6LiF:ZnS(Ag) scintillator and precise localization of the inverse beta decay products. We will describe the principle of detection, the detector design and we will focus on the performance of the full scale SoLid prototype module installed at BR2 early 2015 demonstrating the technology and the segmentation capabilities in terms of background rejection. We will present first results on selecting inverse beta decay candidates using the first data set collected with the SM1 module in 2015, and will show the physics reach of the next phase that will start data taking in mid 2017.
Speaker: Dr Frederic Yermia (Université de Nantes) -
09:45
Search for eV Sterile Neutrinos -- The Stereo Experiment 15m
In the recent years, major milestones in neutrino physics were accomplished at nuclear reactors: the smallest neutrino mixing angle $\theta_{13}$ was determined with high precision and the emitted antineutrino spectrum was measured at unprecedented resolution. However, two anomalies, the first one related to the absolute flux and the second one to the spectral shape, have yet to be solved. The flux anomaly is known as the Reactor Antineutrino Anomaly and could be caused by the existence of a light sterile neutrino eigenstate participating in the neutrino oscillation phenomenon. Introducing a sterile state implies the presence of a fourth mass eigenstate, while global fits favor oscillation parameters around $\sin^2{2\theta} = 0.09$ and $\Delta m^2 = 1.8\,\mathrm{eV}^2$.
The Stereo experiment was built to finally solve this puzzle. It is one of the first running experiments built to search for eV sterile neutrinos and takes data since end of 2016 at ILL Grenoble (France). At a short baseline of 10 meters, it measures the antineutrino flux and spectrum emitted by a compact research reactor. The segmentation of the detector in six target cells allows for independent measurements of the neutrino spectrum at multiple baselines. An active-sterile flavor oscillation could be unambiguously detected, as it distorts the spectral shape of each cell's measurement differently.
This talk will give an overview on the Stereo experiment, along with details on the detector design, detection principle and the current status of data analysis.Speaker: Dr Julia Haser (MPIK Heidelberg) -
10:00
Search for sterile neutrinos at the DANSS experiment 15m
DANSS (JINR, Dubna and ITEP, Moscow) is a one cubic meter highly segmented solid scintillator detector.
It consists of 2500 scintillator strips (100x4x1 cm3), covered with
gadolinium loaded reflective coating and read out by SiPMs via wave length shifting fibers. Groups of 50 strips are also read out by conventional PMTs. DANSS is placed under a 3 GW reactor at the Kalinin NPP (Russia) on a movable platform. The distance from the reactor core center can be changed from 10.7m to 12.7m. The reactor core and other materials provide about 50 mwe shielding against cosmics, which reduces the background drastically. DANSS detects about 5000 Inverse Beta Decay events per day with a background from cosmic muons of about 2.5% only. Results based on more than 6 months of data taking will be presented including reactor off periods. This data set provides sensitivity to a large range of sterile neutrino parameters. Comparison of the measured positron spectrum with Monte Carlo predictions will be also presented.Speaker: Prof. Mikhail Danilov (National Research Nuclear University MEPhI (RU)) -
10:15
PROSPECT: The Precision Reactor Oscillation and Spectrum Experiment 15m
PROSPECT is a reactor antineutrino experiment consisting of a segmented 6Li-loaded liquid scintillator antineutrino detector designed to probe short-baseline neutrino oscillations and precisely measure the reactor antineutrino spectrum. The experiment will be located at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Lab. The three ton detector will be located 7-12 m from the compact, highly enriched uranium HFIR core. Over the past three years, PROSPECT has deployed multiple detectors at HFIR and Yale University to understand the local background environment and to demonstrate active and passive background rejection. Measuring the neutrino spectrum from 235U at a range of baselines will give insight into the recent reactor spectrum discrepancies, provide an important benchmark for future reactor experiments, and will probe the eV-scale sterile neutrino best-fit region at 3sigma within one year of operation at HFIR. In this talk, we will discuss the design, experimental program, and discovery potential of the experiment.
Speaker: Dr David Martinez Caicedo (Illinois Institute of Technology) -
10:30
Sterile neutrino search with the SOX project 15m
The SOX project aims at searching eV scale sterile neutrinos by means of a powerful anti-neutrino source located very close to the Borexino detector at the Gran Sasso Laboratory in Italy
The source will be made with a sample of Ce-144 completely shielded by a thick tungsten container and will be located at 8.25 m from the center of the Borexino detector. The total activity will be around 150 KCi and it will be precisely determined by calorimetric measurements.
The talk will describe the details of the experiment and the expected sensitivity.Speaker: Marco Pallavicini (University of Genova and INFN) -
10:45
Searching for a Sterile Neutrino at J-PARC MLF: JSNS^2 experiment 15m
The JSNS2 experiment aims to search for the existence of neutrino
oscillations with Delta m2 near 1eV2 at the J-PARC Materials
and Life Science Experimental Facility (MLF). With the 1 MW of 3 GeV
proton beam created by Rapid Cycling Synchrotron (RCS) and spallation
neutron target, an intense neutrino beam from muon decay at rest is
available. Neutrinos come predominantly from mu+ decay :
mu+ --> e+ + numubar + nue.
The oscillation to be searched for is numubar to nuebar
which is detected by the inverse beta
decay interaction nuebar + p --> e+ + n, followed by
gammas from neutron capture of Gd.
The two detectors with a fiducial volume of 50 tons are located
24 meters away from the mercury target.Additional physics programs include the cross section measurements with
neutrinos with a few 10 MeV from muon decay at rest and with monochromatic
236MeV from kaon decay at rest..Speaker: Dr Jungsic Park (KEK) -
11:00
Coffee break 30m
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11:30
Sterile Neutrino searches with MINOS and MINOS+ 15m
Three-flavour neutrino oscillations have proved very successful in describing the observed neutrino oscillation data. However, there are also some anomalies, including the excesses of appeared electron neutrino interactions in LSND and MiniBooNE, and a sterile neutrino state at a larger mass-splitting scale can provide an explanation for these results.
The MINOS/MINOS+ experiment was a long-baseline neutrino experiment in the US, collecting beam and atmospheric neutrino interactions from 2003 until 2016. MINOS was optimised for the study of muon neutrino disappearance in the NuMI beam at Fermilab. The continuation of the experiment with a medium energy beam configuration is called MINOS+. A sterile neutrino in MINOS/MINOS+ would appear as a perturbation on the three-flavour oscillations in both muon neutrino disappearance and electron neutrino appearance channels. A search for sterile neutrinos has been performed using charged-current and neutral-current interactions in two detectors separated by 734km. The inclusion of two years of MINOS+ data and an improved fit method provides a much increased sensitivity over the previous MINOS result that was combined with Daya Bay. The magnetised nature of the MINOS detectors has been used to perform a similar analysis using antineutrinos. Finally, a search for sterile-driven anomalous appearance of electron neutrinos has been performed with MINOS+.
Speaker: Leigh Howard Whitehead (CERN) -
11:45
The Short Baseline Neutrino Program at Fermilab 15m
The Fermilab Short-Baseline Neutrino (SBN) program, with three liquid argon time projection chamber (LAr-TPC) detectors located along the Booster Neutrino Beam, presents a rich physics and R&D opportunity. SBN will perform sensitive searches for neutrino oscillations in both appearance and disappearance channels at the 1 eV^2 mass- splitting scale, thereby testing the sterile neutrino interpretation of the anomalous excesses of electron (anti)neutrinos observed by LSND and MiniBooNE. Also, the SBN detectors play a major role in on-going R&D efforts aimed at realizing multi-kiloton-scale LAr-TPC detectors in the next generation long-baseline neutrino oscillation experiment DUNE. To form the SBN program, two additional detectors will join MicroBooNE (currently operational at 470m along the beam); the new Short-Baseline Near Detector (SBND) will be installed at 110m, and the largest existing LAr-TPC, the ICARUST600, will be transported to Fermilab in 2017 and sited at 600m. In this talk, we present the current status of the SBND and ICARUS detectors and review the physics reach of the full three- detector SBN program.
Speaker: Dr Serhan Tufanli (Yale) -
12:00
The Short Baseline Neutrino Detector at Fermilab 15m
SBND (Short-Baseline Near Detector) is a 112 ton liquid argon TPC neutrino
detector under construction on the Fermilab Booster Neutrino Beam.
Together with MicroBooNE and ICARUS-T600, SBND will search for shortbaseline neutrino oscillations in the 1 $eV^2$ mass range. SBND will also perform
detailed studies of the physics of neutrino-argon interactions, thanks to a data
sample of millions of electron and muon neutrino interactions. Finally SBND
plays an important role in the on-going R&D effort to develop the LArTPC technology,
testing several technologies that can be used in a future kiloton-scale
neutrino detectors for a long-baseline experiment. We will discuss the detector
design, its current status, and the physics program.Speaker: Dr Diego Garcia Gamez (Manchester University) -
12:15
Long baseline experiments: a new window on sterile neutrinos 15m
One of the hottest topics in present-day neutrino physics is provided by the hints of sterile species coming from the short-baseline (SBL) anomalies.
Waiting for a definitive (dis-)confirmation of these indications by future
SBL experiments, other complementary avenues can be explored in the
hunt of such elusive particles. An important opportunity is that offered by the
long-baseline (LBL) experiments which, as I will show, are sensitive to novel
interference effects mediated by the new large squared-mass splitting. This renders the LBL experiments the sole setups sensitive to the new sources of CP-violation involved in the 4-flavor scheme. I will point out that the experiments NOvA and T2K already provide the first indications on one of the new CP-phases. I will also describe how the future LBL experiments will be able to pin down the new CPV sector.Speaker: Antonio Palazzo (University of Bari and INFN) -
12:30
The ICARUS experiment 15m
The 760 ton liquid argon ICARUS T600 detector performed a successful three-year physics run at the underground LNGS laboratories, studying neutrino oscillations with the CNGS neutrino beam from CERN, and searching for atmospheric neutrino interactions in cosmic rays. A sensitive search for LSND like anomalous nu_e appearance was performed, contributing to constrain the allowed parameters to a narrow region around Δm$^2$~eV$^2$, where all the experimental results can be coherently accommodated at 90% C.L.
The T600 detector will be redeployed at Fermilab, after a significant overhauling, to be exposed to the Booster Neutrino Beam acting as the far station to search for sterile neutrino within the SBN program.
The proposed contribution will address ICARUS LNGS achievements and the ongoing analyses also finalized to the next physics run at Fermilab.Speaker: Filippo Varanini (Universita e INFN, Padova (IT)) -
12:45
Improved Search for a Light Sterile Neutrino at Daya Bay 15m
The Daya Bay Reactor Neutrino Experiment currently holds for the most precise measurement of the third neutrino mixing angle θ13~8.4^o, which unlocked the gateway of studying the CP violation in the lepton sector, and the most precise measurement of |Δm^2_32|. The multiple detectors at different locations also allow for using relative energy spectral analysis to search for a light sterile neutrino with corresponding mass-squared splitting Δm^2_41 below 0.3 eV^2. This result was combined with those of Bugey-3 and MINOS to set limits in the anomalous muon to electron neutrino appearance oscillation. For Δm^2_41 above 0.3 eV^2, Daya Bay tested the foundation of the sterile neutrino explanation of the reactor antineutrino anomaly through measurements of reactor flux, energy spectrum, and fuel evolution. In this talk, we will present the latest results.
Speaker: Xin Qian (Brookhaven National Laboratory)
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QCD and hadronic physics Room Mosaici-1 (Palazzo del Casinò)
Room Mosaici-1
Palazzo del Casinò
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09:00
Progress in higher-order QCD calculations 30m
I will review recent progress in the calculation of higher-order QCD corrections and their impact for precision measurements and new physics searches at the LHC.
Speaker: Giulia Zanderighi (CERN) -
09:30
Extraction of alpha_s at NNLO and measurement of jet cross sections in Deep-inelastic Scattering at HERA 15m
A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $5.5 < Q^2 < 80$ GeV$^2$ and inelasticities $0.2 < y < 0.6$ is presented, using data taken with the H1 detector at HERA, corresponding to an integrated luminosity of 290 pb$^{−1}$. Double-differential inclusive jet, dijet and trijet cross sections are measured simultaneously and are presented as a function of jet transverse momentum observables and as a function of $Q^2$. Jet cross sections normalised to the inclusive neutral current DIS
cross section in the respective $Q^2$-interval are also determined. Previous results of inclusive jet cross sections in the range $150 < Q^2 < 15 000$ GeV$^2$ are extended to low transverse jet momenta $5 < P_T < 7$ GeV. The data are compared to predictions from perturbative QCD in next-to-leading order in the strong coupling, in approximate next-to-next-to-leading order and in full next-to-next-to-leading order. Using also the recently published H1 jet data at high values of $Q^2$, the strong coupling constant $\alpha_s(M_Z)$ is determined in next-to-leading order. [arxiv:1611.03421, accepted by EPJC]
A first determination of the strong coupling αs in next-to-next-to leading order (NNLO) from inclusive jet and dijet production in deep-inelastic scattering at HERA is presented. The strong coupling is determined in a fit of jet data collected by the H1 experiment in the range of momentum transfer 5.5<Q2<15000 GeV2 and jet transverse momenta pT>5 GeV. The running of the strong coupling is probed in a single experiment over one order of magnitude in the remornalisation scale μr. NNLO predictions were obtained using the program NNLOJET, where the corresponding calculations are based on antenna subtraction techniques.Speakers: Daniel Britzger (Deutsches Elektronen-Synchrotron (DE)), Daniel Britzger (Deutsches Elektronen-Synchrotron (DE)) -
09:45
Multi-differential jet cross sections in CMS 15m
We present measurements of multi-differential Jet cross sections over a wide range in transverse momenta from inclusive jets to multi-jet final states. We present studies on the impact these measurements have on the determination of the strong coupling alphas as well as on parton density functions. We also show angular correlations in multi-jet events at highest center-of-mass energies and compare the measurements to theoretical predictions including higher order parton radiation and coherence effects.
Speaker: Panos Kokkas (University of Ioannina (GR)) -
10:00
Measurement of jet production with the ATLAS detector and extraction of the strong coupling constant 15m
The production of jets at hadron colliders provides a stringent test of perturbative QCD at the highest energies. The process can also be used to probe the gluon density function of the proton. Specific topologies can be used to extract the strong coupling constant.
The ATLAS collaboration has recently measured the inclusive jet production cross section in data collected at a center-of-mass energy of 8TeV and 13TeV. The measurements have been performed differentially in jet rapidity and transverse momentum. The collaboration also presents a first measurement of the di-jet cross section at a center-of-mass energy of 13TeV as a function of the di-jet mass and rapidity. The results have been compared with state-of-the-art theory predictions at NLO in pQCD, interfaced with different parton distribution functions and can be used to constrain the proton structure.
We also present new measurements of transverse energy-energy correlations (TEEC) and their associated asymmetries (ATEEC) in multi-jet events at a center-of-mass energy of 8TeV. The data is unfolded to the particle level and compared to the expectations from parton shower Monte Carlo programs as well as from next-to-leading order perturbative QCD calculations. The latter are also used to extract the strong coupling constant and test the renormalization group equations.
Speaker: Lee Sawyer (Louisiana Tech University (US)) -
10:15
Measurements of event properties with jets in CMS 15m
We present results on measurements of characteristics of events with jets, from jet-charge over investigations of shapes to jet mass distributions. The measurements are compared to theoretical prediction including those matched to parton shower and hadronization.
Speaker: Nadia Pastrone (Universita e INFN Torino (IT)) -
10:30
Jet production at high precision using the CoLoRFulNNLO method 15m
We compute cross section for the production of three jets in electron-positron annihilation at next-to-next-to-leading order (NNLO) accuracy. We use a general subtraction scheme developed for computing QCD jet cross sections in perturbation theory. This method is implemented in the Monte Carlo for the CoLoRFulNNLO Subtraction Method (MCCSM) program that provides a general framework for computing QCD jet cross sections at NNLO accuracy, requiring only the implementation of the necessary squared matrix elements. We demonstrate the good numerical convergence of the MCCSM program by providing stable predictions over the whole kinematic range including small values of the jet resolution variable. We provide high-precision perturbative predictions for jet rates by matching the predictions at NNLO accuracy with cross sections obtained by resumming the leading and next-to-leading logarithms at all orders in perturbation theory for jets defined by the exclusive and inclusive Durham clustering algorithms. We also discuss the status of extending the method to jet hadroproduction.
Speaker: Zoltan Laszlo Trocsanyi (University of Debrecen (HU)) -
10:45
A framework for High Energy Factorisation matched to parton showers 15m
High Energy Factorisation was applied so far almost exclusively to Deep Inelastic Scattering process, as computing gauge invariant matrix elements with off shell external legs is a highly non trivial task. In recent years, this problem has been completely solved in a variety of ways, both analytically and numerically. The times are mature to produce the first phenomenological predictions.
We present the first framework to produce predictions for hadron colliders based on matching off shell gauge invariant matrix elements in the High Energy Factorisation kinematics and for any Standard Model process to the parton showers implemented in the CASCADE program.
We then discuss predictions for multi-jet phenomenology, with a special focus on the description of ATLAS and CMS data for inclusive four-jet production with and without Multi Parton Interactions.Speaker: Mirko Serino (Institute of Nuclear Physics, Polish Academy of Sciences) -
11:00
Coffee break 30m
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11:30
Recent developments in the computation of scattering amplitudes beyond one loop 13m
In this presentation, we review the general features of integrand-reduction techniques with a particular focus on their generalization beyond one loop. We briefly summarize the ongoing efforts in the field, whose ultimate goal is the development of efficient alternative computational techniques for the evaluation of Feynman integrals beyond one loop. Finally, we describe some recent applications of the GoSam 2.0 automated framework, originally designed for one-loop calculations, to processes beyond one loop. In particular, a customized version of GoSam have been recently employed to study the production of a top-antitop pair in association with a vector boson or with the Higgs boson at next-to-next-to-leading logarithmic accuracy. In the context of these calculations, the modified version of GoSam was used to evaluate the NLO hard functions which are needed to carry out the resummation of soft gluon emission effects.
Speaker: Giovanni Ossola (City University of New York (US)) -
11:43
The five-loop beta function in QCD 13m
In this talk I will present a new result for the beta function in QCD, valid for a general gauge group. I will briefly summarise the methods which were used to obtain this result and explain its impact on low energy strong coupling extractions and precision observables at NNNNLO in perturbative QCD, such as the Higgs decay width and the total cross section for e+ e- to Hadrons.
Speaker: Franz Herzog (Nikhef) -
11:56
Nearly perturbative QCD coupling with lattice-motivated zero IR limit 13m
The product of the gluon dressing function and the square of the ghost dressing function in the Landau gauge can be regarded to represent, apart from the inverse power corrections $1/Q^{2n}$, a nonperturbative generalization $A(Q^2)$ of the perturbative QCD running coupling $a(Q^2)$ ($\equiv \alpha_s(Q^2)/\pi$). Recent large volume lattice calculations for these dressing functions strongly indicate that such a generalized coupling goes to zero as $A(Q^2) \sim Q^2$ when the squared momenta $Q^2$ go to zero ($Q^2 \ll 1 \ {\rm GeV}^2$). We construct such a QCD coupling $A(Q^2)$ which fulfills also various other physically motivated conditions. At high momenta it becomes the underlying perturbative coupling $a(Q^2)$ to a very high precision. And at intermediately low momenta $Q^2 \sim 1 \ {\rm GeV}^2$ it gives results consistent with the data of the semihadronic $\tau$ lepton decays as measured by OPAL and ALEPH. The coupling is constructed in a dispersive way, ensuring as a byproduct the holomorphic behavior of $A(Q^2)$ in the complex $Q^2$-plane which reflects the holomorphic behavior of the spacelike QCD observables. Application of the Borel sum rules to $\tau$-decay $V+A$ spectral functions allows us to obtain values for the gluon (dimension-4) condensate and the dimension-6 condensate, which reproduce the measured OPAL and ALEPH data to a significantly better precision than the perturbative ${\overline {\rm MS}}$ coupling (+OPE) approach. The comparison with the experimental $V$-channel Adler function, related with the $e^+ e^- \to$ hadrons ratio, at low $Q^2 \sim 1 \ {\rm GeV}^2$, also gives results considerably better than with the usual ${\overline {\rm MS}}$ pQCD+OPE approach.
Speakers: Dr Gorazd Cvetic (Universidad Tecnica Federico Santa Maria), Gorazd Cvetic -
12:09
A precise and high-quality determination of $\alpha_s(m_Z)$ 13m
Starting from low energy hadronic input from the particle data book,
we perform a non-perturbative lattice computation of running couplings
up to scales of around 100GeV. The continuum limit is controlled in all
stages. These non-perturbative computations are performed in the
three-flavor theory, yielding $\Lambda^{(3)}$ with around $4\%$ precision.
Matching accross flavor thresholds with 4-loop perturbation theory then yields
$\alpha_s^{(5)}(m_Z)$ with sub-percent precision where an error estimated
as the contribution of the two highest orders of perturbation theory is
a small component in the overall error budget.Speaker: Patrick Fritzsch (CERN) -
12:22
Running of the Charm-Quark Mass from HERA Deep-Inelastic Scattering Data 13m
Combined HERA data on charm production in deep-inelastic scattering
have previously been used to determine the charm-quark running mass
$m_c(m_c)$ in the MSbar renormalisation scheme.
Here, the same data are used as a function of the photon virtuality $Q^2$
to evaluate the charm-quark running mass at different scales to one-loop
order, in the context of a next-to-leading order QCD analysis.
The scale dependence of the mass is found to be consistent with QCD
expectations.Speakers: Andrii Gizhko (DESY), Andrii Gizhko (Deutsches Elektronen-Synchrotron (DE)), Andrii Gizhko (D) -
12:35
Charm Quark Mass with Calibrated Uncertainty 13m
We determine the charm quark mass $m_c(m_c)$ from QCD sum rules of moments of the vector current correlator calculated in perturbative QCD. Only experimental data for the charm resonances below the continuum threshold are needed in our approach, while the continuum contribution is determined by requiring self-consistency between various sum rules, including the one for the zeroth moment. Existing data from the continuum region can then be used to bound the theoretical error. Our result is $m_c(m_c) = 1272 \pm 8$ MeV for $\alpha_s(M_Z) = 0.1182$. Special attention is given to the question how to quantify and justify the uncertainty.
Speaker: Prof. Jens Erler (IF-UNAM) -
12:48
Hemisphere Mixing: A Fully Data-Driven Model Of QCD Multijet Backgrounds For LHC Searches 12m
Multijet processes have always been hard to model precisely in hadron collisions, and reliance of experimental studies and searches on Monte Carlo simulations has been problematic, at times resulting in controversies and retractions. Nowadays matrix-element-based tools can accurately predict the general features of energetic collisions producing several hadronic jets, yet often the huge involved cross sections make these events impractical to handle with simulations, hence analysts prefer to resort to signal-depleted control samples for their searches of new phenomena at the high-energy frontier.
A method never used before in hadron collisions is proposed here as a tool to model multijet processes. The method, dubbed "hemisphere mixing", is based on exploiting the schematization of high-pT QCD processes as 2->2 reactions made complex by subleading effets. The construction of libraries of "half events" with experimental data, and a kNN-based association map, allow the generation of artificial datasets that are shown to reproduce with surprising accuracy the kinematics of the background component in the original data, while washing out the effect of any small signal. The method will be described and tested with statistical procedures considering the multi-dimensional space of event features, and results based on LHC data will be shown to illustrate the excellent properties of the model.Speakers: Dr Tommaso Dorigo (INFN), Tommaso Dorigo (Universita e INFN, Padova (IT))
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Top and electroweak Room Volpi (Palazzo del Casinò)
Room Volpi
Palazzo del Casinò
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09:00
Multiboson production VV(V) with the CMS detector 15m
We present the most recent inclusive and differential measurements of multiboson production (VV, VVV) with data collected by the CMS during Run I & II.
Speaker: Nate Woods (University of Wisconsin-Madison (US)) -
09:15
Measurement of the diboson production cross section at 8TeV and 13TeV and limits on anomalous triple gauge couplings with the ATLAS detector 15m
Measurements of the cross sections of the production of pairs of electroweak gauge bosons at the LHC constitute stringent tests of the electroweak sector of the Standard Model and provide a model-independent means to search for new physics at the TeV scale.
The ATLAS collaboration has performed new measurements of integrated and differential cross sections of the production of heavy di-boson pairs in fully-leptonic and semi-leptonic final states at centre-of-mass energies of 8 and 13 TeV. We present in particular new measurements of WW, WZ and Z+photon cross sections in semi-leptonic or hadronic decays using standard or boosted technologies and new measurements of the inclusive and differential ZZ cross section at 13 TeV in various decay modes. In addition, the invariant mass of four leptons is measured at 13 TeV over a larger range, covering several production modes.
The results are compared to predictions at NLO (and NNLO) in pQCD and provide constraints on new physics, by setting limits on anomalous triple gauge couplings.
Speaker: Will Buttinger (Brookhaven National Laboratory (US)) -
09:30
Vector boson scattering, triple gauge-boson final states and limits on anomalous quartic gauge couplings with the ATLAS detector 15m
Measurements of the cross sections of the production of three electroweak gauge bosons and of vector-boson scattering processes at the LHC constitute stringent tests of the electroweak sector of the Standard Model and provide a model-independent means to search for new physics at the TeV scale. The ATLAS collaboration has recently searched for the production of three W bosons or of a W boson and a photon together with a Z or W boson at a center of mass energy of 8 TeV. We also present searches for the electroweak production of a Z boson and a photon together with two jets. The results are compared to state-of-the art theory predictions and have been used to constrain anomalous quartic gauge couplings.
Speaker: Bing Li (University of Michigan (US) & Univ. of Science & Tech. of China (CN)) -
09:45
VV+jets (VBS) with the CMS detector 15m
The production of massive vector boson pairs is a key process for the understanding of the non-abelian gauge structure of the standard model and for the comprehension of the electroweak symmetry breaking mechanism. The study of the production of vector boson pairs with the presence of two jets in the event allows to measure the electroweak production of vector bosons in association with jets, in particular made up through vector boson scattering (VBS) processes. In this presentation, we will report the recent results of the production of diboson in association with two jets at \sqrt{s} = 8 and 13 TeV.
Speaker: Riccardo Bellan (Universita e INFN Torino (IT)) -
10:00
Resonances and loops: scale interplay in the Higgs effective theory 15m
I will discuss the structure of the loop corrections in the case of the non-linear EW effective theory and compare it with the low-energy contributions from the exchange of heavy resonances. The convenience of using either the non-linear HEFT or the linear SMEFT will depend on the interplay of the scales that control these two types of contributions.
Speaker: Juan José Sanz-Cillero (Universidad Complutense de Madrid) -
10:15
Electroweak baryogenesis via top transport 15m
We study electroweak baryogenesis driven by up-type heavy quarks in
a general two Higgs doublet model with $CP$ invariant Higgs potential.
With Higgs sector couplings and an additional top Yukawa coupling $\rho_{tt}$
all of $\mathcal{O}(1)$ in strength, one naturally has sizable $CP$ violation
that fuels a cosmic baryon asymmetry. Even if $\rho_{tt}$ vanishes, the flavor violating top-charm coupling $\rho_{tc}$ can still lead to successful
baryogenesis. Phenomenological consequences such as electron electric dipole
moment, $h \to \gamma\gamma$, and the interplay with $h\to\mu\tau$ and
$\tau\to\mu\gamma$, are discussed.Speakers: Prof. George W.S. Hou, George Wei-Shu Hou (National Taiwan University (TW)) -
10:30
Electromagnetic processes in ultra peripheral lead-lead collisions with ATLAS 15m
The large equivalent-photon fluxes accompanying Pb ion beams at the LHC initiate photon-photon and photo-nuclear interactions which dominate when the colliding nuclei have large impact parameter (ultra-peripheral collisions). These electromagnetically-induced processes are sensitive to the nuclear wave-function and in particular the nuclear modifications of the nucleon parton distribution functions (nPDFs). As such, they are complementary to the ongoing p+A program at RHIC and the LHC, as well as the upcoming electron-ion collider (EIC) program in the US. The absolute rates of single and multiple neutron emission into one or both zero-degree calorimeters (ZDCs) will be presented, to test theoretical predictions for the photon fluxes as well as the photonuclear absorption. High-mass dilepton pair continuum rates have been measured and compared with theoretical predictions to test expectations for two-photon interactions, and good agreement with model calculations is obtained. Finally, evidence for the elastic scattering of photons ("light-by-light" scattering) will be presented, a previously unobserved process made possible by the high photon flux and low event pileup provided by the LHC. While of intrinsic interest as a heretofore-unobserved standard model process, it has also been proposed as a clean channel for searches for beyond the standard model (BSM) physics.
Speaker: Matthias Schott (Johannes-Gutenberg-Universitaet Mainz (DE)) -
10:45
$\gamma\gamma \to \gamma \gamma$ scattering in ultrarelativistic UPC 15m
We will report on our results for light-by-light scattering in
ultraperipheral Pb-Pbcollisions at the LHC.
We calculate cross section for the elementary $\gamma \gamma \to \gamma \gamma$
subprocess taking into account the following contributions:
(a) box mechanisms with leptons and quarks in the loops,
(b) VDM-Regge mechanism (fluctuation of both photons to vector mesons
and their interaction) and
(c) two-gluon exchange.Our nuclear calculations are based on equivalent photon approximation in the impact parameter space.
We use realistic charge form factor of nuclei which is a Fourier transform
of the charge distribution in nuclei.
Our estimate has shown that ultraperipheral Pb-Pb
collisions can be measured at the LHC. This opened a possibility
to study the $\gamma\gamma \to \gamma\gamma$ scattering at the LHC.
Our rather optimistic predictions became a motivation for experimental groups
to perform corresponding experimental studies.
Very recently, the ATLAS Collaboration observed 13 events for light-by-light scattering in ultraperipheral Pb-Pb collisions.
They obtained the cross section of 70$\pm$20(stat.)$\pm$17(syst.) nb.
Simultaneously, our Standard Model predictions gave 49$\pm$10 nb.
Our theoretical calculations were a source of ATLAS Monte Carlo simulation.
The ATLAS measurement is a first experimental observation of the
$\gamma \gamma \to \gamma \gamma$ mechanism.In the talk, we shall present many differential distributions.
We shall discuss a possibility of a separation and identification of different components
(three subprocesses mentioned above). We shall present a similar
analysis for the pp$\to$pp$\gamma\gamma$ reaction.This talk will be based mainly on our analyses which were presented in Ref. [1] and [2].
[1] M. K{\l}usek-Gawenda, P. Lebiedowicz and A. Szczurek,
Phys. Rev. C93 (2016) 044907,[2] M. K{\l}usek-Gawenda, W. Sch\"afer and A. Szczurek,
Phys. Lett. B761 (2016) 399.[3] The ATLAS Collaboration,
ATLAS-CONF-2016-111 (2016).Speakers: Mariola Kłusek-Gawenda (IFJ PAS), Antoni Szczurek (Institute of Nuclear Physics) -
11:00
Coffee break 30m
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11:30
Top physics measurements at LHCb 15m
LHCb, while purpose built for b-physics, also functions as a general purpose forward detector, covering the pseudo-rapidity range 2.0 to 5.0. LHCb has measured forward top production using final states accessible from both single top and top pair production processes. Measurements in the LHCb acceptance have particular sensitivity to high and low values of Bjorken-x when compared to other LHC measurements, and consequently offer complementary constraints on Bjorken-x. A selection of LHCb results in this area will be presented.
Speaker: Stephen Farry (University of Liverpool (GB)) -
11:45
Top quark production cross-section measurements with the ATLAS detector 15m
Measurements of the inclusive and differential top-quark pair and single-top production cross sections in proton-proton collisions with the ATLAS detector at the Large Hadron Collider at center-of-mass energies of 8 TeV and 13 TeV are presented. The inclusive measurements reach high precision and are compared to the best available theoretical calculations. Differential measurements of the kinematic properties of the top-quark production are also discussed. These measurements, including results using boosted tops, probe our understanding of top-quark pair production in the TeV regime.
Speaker: Chris Pollard (University of Glasgow (GB)) -
12:00
CMS measurements of top quark pair production 15m
Measurements of the inclusive and differential top quark pair production cross section in proton-proton collisions at 5.02 TeV, 7 TeV, 8 TeV and 13 TeV are presented using the CMS detector. The total cross section is measured using the lepton+jets, dilepton and fully hadronic channels, including the tau-dilepton and tau+jets modes. Indirect constraints on both the top quark mass and ɑS are obtained through their relation to the inclusive cross section. Measurements of top quark pair production in addition with jets, including heavy-flavoured jets are also presented. In addition, differential cross sections are measured and are given as functions of various kinematic observables, including the transverse momentum and rapidity of the (anti)top quark and the top-antitop system and the jets and leptons of the event final state. The measurements are extended to the TeV range using jet substructure techniques to exploit the boosted regime. The multiplicity and kinematic distributions of the jets produced in addition to the top pair are also investigated. The results are combined and confronted with precise theory calculations.
Speaker: Till Michael Arndt (Deutsches Elektronen-Synchrotron (DE)) -
12:15
Fully-differential predictions for top pair-production and decay at high precision 15m
We present state-of-the-art, high-precision predictions for top-quark pair production in the di-lepton channel at the LHC.
Our results are based on the narrow-width approximation and include approximate NNLO corrections in the production subprocess, exact NNLO corrections in the decay sub-process as well as exact NLO-production/NLO-decay interferences.
We will briefly outline the structure of this new calculation and discuss the importance of the corrections beyond NLO.
A comparison of these improved predictions to ATLAS and CMS fiducial-region measurements will also be shown.Speaker: Andrew Papanastasiou (University of Cambridge) -
12:30
Single Top quark production cross section measurements using the ATLAS detector 15m
Measurements of single top-quark production in proton-proton collisions are presented based on the 8 TeV and 13 TeV ATLAS datasets. For the production of single top-quarks and single anti-top-quarks in the t-channel, the total production cross sections, their ratio, as well as measurements of inclusive and differential cross-sections are presented. Measurements of the inclusive and differential production cross section of a single top quark in association with a W boson, the second largest single-top production mode, are also presented. Smaller single top quark measurements in the s-channel and in association with a Z boson are also presented. All measurements are compared to state-of-the-art theoretical calculations.
Speaker: Muhammad Alhroob (University of Oklahoma (US)) -
12:45
Measurement of single top quark production with CMS 15m
Several measurements of single top quark production in proton-proton collisions at the LHC at centre-of-mass energies of 7, 8 and 13 TeV, using data collected with the CMS experiment, are presented. The analyses investigate separately the productions of top via t-channel exchange, in association with a W boson (tW) or via the s-channel. Final states with at least one charged lepton and one b-jet are explored to measure inclusive production cross sections. Fiducial and differential cross section measurements in the t-channel are also reported. The measurements can be used to constrain directly the Vtb CKM matrix element by comparing with the most precise standard model theory predictions. Measurements of rare processes involving a top quark and a neutral EWK boson (Z or photon) are also discussed.
Speaker: Jeremy Andrea (Institut Pluridisciplinaire Hubert Curien (FR))
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Lunch break 1h 30m
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18:30
Cosmology, dark energy, gravitational waves Room Martinelli (Palazzo del Casinò)
Room Martinelli
Palazzo del Casinò
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14:30
Cosmological results from the Kilo Degree Survey 15m
Gravitational lensing represents a unique tool to study the dark Universe. In the weak lensing regime small distortions in the images of galaxies caused by the large-scale structure can be detected over the whole sky. Measuring these coherent distortions yields cosmological insights complementary to other probes like the cosmic microwave background (CMB). Ongoing wide-field imaging surveys exploit this to come up with competitive constraints on important cosmological parameters. In this talk I will concentrate on recent results from the ongoing European Kilo Degree Survey (KiDS) and show a mild tension of these results with CMB measurements from the Planck mission when the standard cosmological model is assumed. Possible solutions to this discrepancy using extensions to the standard model of cosmology and future developments will be discussed. I will conclude with an outlook towards missions like Euclid, LSST, and WFIRST.
Speaker: Hendrik Hildebrandt -
14:45
Status and recent results of the Dark Energy Survey 15m
The Dark Energy Survey (DES) is a large galaxy survey designed to address the fundamental question of the accelerating expansion of the universe and uncover the nature of the dark energy. It started the data taking in 2013, providing high quality imaging for 1/8 of the sky. The talk will present the current status of the project and the most recent results, mainly based on data from the first season of observations, where an exhaustive analysis for the control of systematic effects has been performed.
Speaker: Dr Eusebio Sanchez (CIEMAT) -
15:00
Euclid Mission 15m
The Esa satellite Euclid will launch in 2020. It will observe 15000deg2 of the darkest sky with his visible imager and his near-IR photometer and spectrograph.
The core science goal of the mission is to measure the evolution of the expansion of the universe up to redshift 2 in order to characterise deviations from the concordance LambdaCDM model, determine the evolution properties of dark energy and test GR.
To do so, Euclid will map the distribution of matter in the universe using 2 main probes: Weak gravitational lensing, measuring the gravitationally induced distortion of the apparent shapes of about one billon of galaxies, and Galaxy Clustering (BAO and RSD), using several tens of million of spectroscopic redshift determinations.
I will present the main objectives of the mission, his forecasted efficiency, and give an update of its current status.Speaker: Mr karim benabed (Institut d'Astrophysique de Paris - CNRS/UPMC) -
15:15
LSST: project status 15m
The Large Synoptic Survey Telescope (LSST) is an automated ground-based 8.4m optical telescope, whose first observations are expected in 2023. The aim of this new instrument is to conduct a ten year wide and deep imaging survey of 18,000 square degrees of the sky in six broad optical bands, with a deep stack reaching magnitude $r=27.5$. The LSST design is driven by four science themes: dark energy and dark matter, galactic structure, transient objects, and the Solar System inventory. After a quick presentation of the LSST subsystems and of the project status, I will focus on the LSST cosmological probes, and more specifically on the large-scale structures and weak lensing science reaches. I will highlight the on-going preparation studies about the photometric redshift reconstruction for galaxies and the possibilities in terms of cross-correlations with other cosmological data and surveys.
Speaker: Jeremy Neveu (LAL, Université Paris-Sud) -
15:30
Status of the Advanced LIGO and Advanced Virgo Detectors 15m
This talk will present the status of the Advanced LIGO and Advanced Virgo detectors, a year after the first detections of gravitational waves emitted by two binary black hole coalescences. After a 10-month break due to upgrades, maintenance and commissioning, the Advanced LIGO detectors started their second ?Observation Run? (O2) on November 30th 2016. This data taking period is expected to last until about mid-2017, before another long shutdown to further improve the sensitivity of the instruments. In the meantime, the Advanced Virgo commissioning started mid-2016 and substantial progress have been made since then towards controlling the detector in its nominal configuration. The goal of the Virgo collaboration is to join the Advanced LIGO detectors for a common data taking period before O2 ends.
Speaker: Nicolas Arnaud (LAL (CNRS-IN2P3)) -
15:45
Results of transient GW searches with Advanced LIGO 15m
The detection of gravitational waves from the merger of binary black holes during the first Advanced LIGO science runs has opened up a new field of astronomy, and a new window on the universe. During these runs, searches for different types of compact binaries are conducted. In this talk, I will review the detected black hole mergers, and discuss the implications of the non-detection of other transient source types, such as binary neutron stars and intermediate mass black holes, in the first science run.
Speaker: Ed Porter (APC-Paris / CNRS) -
16:00
Coffee break 30m
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16:30
Testing the strong-field dynamics of general relativity with gravitational wave signals from compact binary coalescences 15m
The observations of the presumed binary black hole coalescences GW150914 and GW151226 during the first observing run of Advanced LIGO have allowed us to probe the genuinely strong-field dynamics of Einstein's general theory of relativity (GR) for the first time. We give a brief overview of the tests carried out on the detected signals, which showed consistency with GR within the measurement uncertainties. As the detectors undergo further upgrades, more and louder signals are likely to be observed. This will enable us to not only put tighter constraints on the inspiral-merger-ringdown dynamics of the binary coalescence process, but also more directly probe the nature of the compact objects themselves, in complementary ways. During inspiral, massive objects that deviate from standard black holes (e.g. boson stars or dark matter stars) may give away their non-standard nature through tidal effects. Observation of the "ringdown" of the merger remnant allows for a test of the black hole no-hair theorem. Finally, certain quantum modifications to black holes (e.g. firewalls) are speculated to have macroscopic consequences, in the form of gravitational wave "echoes", or bursts of radiation that appear at regular time intervals after the ringdown has ended. Thus, the direct observation of gravitational waves opens up unique possibilities to put ideas in fundamental physics and cosmology to the test.
Speaker: Archisman Ghosh (Nikhef) -
16:45
Astrophysical and cosmological results from compact binary coalescences 15m
Gravitational-wave astronomy has made a tremendous stride forward with detections during the first observing run of the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO). The signals have been identified as originating from the merger of black holes, whose parameters it was possible to infer. This discovery has profound implications. Gravitational waves provide information on some of the most energetic astrophysical events, revealing unique insights into the nature of gravity and of our universe. In this talk I will describe how gravitational-wave signals are studied, and discuss the results of this analysis on LIGO's first observations.
Speakers: Dr Vivien Raymond (Max Planck Institute for Gravitational Physics), Vivien Raymond (Max Planck Institute for Gravitational Physics) -
17:00
GW transient searches to probe Neutron star physics 15m
Transient gravitational wave emission can originate by phenomena associated with neutron stars (NSs) oscillations modes, such as hyperflares from galactic magnetars and binary coalescence. Potential signals related to these events are generally not well-modeled, requiring robust, morphology-independent analysis techniques. In particular, the coalescence of binary neutron stars (BNS) is a promising source of gravitational waves detectable by the advanced LIGO and Virgo interferometers. The mass of the binary system and the NS equation of state (EoS) can lead to different scenarios for the system evolution: prompt collapse to black hole, formation of a remnant hypermassive (HMNS) or supramassive (SMNS) neutron star with a delay collapse to black hole, or even a stable NS. In case of HMNS or SMNS formation, the newly-born NS is strongly perturbed: among the excited modes of the NS, the fundamental (quadrupolar) one is expected to produce in the emitted GW spectrum a strong peak typically in the kHz range. Therefore the characterization of the spectrum of the post merger phase (PMNS) allows to infer astrophysical properties of the source and to constrains on the EoS.
With Advanced interferometer detectors, we may soon use BNS to investigate matter in an extremely dense state. We will discuss the research on the spectral properties of GWs due to BNS, focusing on the PM phase, and the analysis, under development, to unfold properties of the compact object; we will report the observing scenarios in the upcoming data taking of the interferometers network.Speaker: Dr Claudia Lazzaro (INFN ) -
17:15
Low latency gravitational wave searches for prompt multimessenger followups 15m
The gravitational wave era has started with the detections of gravitational waves originated from the coalescences of black holes. This gives new challenges and interests to the multi-messenger approach, which aims to reach the extraordinary result of identifying the counterparts. In this talk, we review the gravitational wave low-latency algorithms used by the LIGO-Virgo collaboration. Those algorithms produce triggers within a few minutes of the arrival time at the detectors. The most significant triggers are shared with the electromagnetic partners (from radio to gamma-ray) as well as neutrino and high energy cosmic ray observatories.
Speaker: Marco Drago -
17:30
Stochastic GW searches and Cosmology with GWs 15m
A stochastic background of gravitational waves can be described as a superposition of several uncorrelated contributions. It can be of both cosmological and astrophysical origin. In the first case, it can constitute potentially a unique probe of the primordial universe. In the second, it can give precious information on stellar populations. After discussing how this kind of signal can be detected and what information can be extracted from its study, I review the past and ongoing efforts to find it, the current upper limits and the future perspective for its
detection.Speaker: Giancarlo Cella (INFN - National Institute for Nuclear Physics) -
17:45
The search for continuous gravitational waves with LIGO and Virgo detectors 15m
Continuous gravitational waves emitted by spinning neutron stars, isolated or in binary systems, are among the main targets of LIGO and Virgo interferometric detectors. No continuous wave has been detected so far, but significant upper limits, providing interesting constraints on the characteristics and demography of the potential sources, have been obtained. In this talk I will review the current status of continuous wave searches, highlight some recent results and discuss future prospects in this field.
Speaker: Dr Cristiano Palomba (INFN sez. di Roma) -
18:00
Extending the gravitational waves searches for black holes with intermediate masses and residual eccentricity at merger 15m
Detections of stellar mass binary black holes (BBHs) system in the first observing run of LIGO interferometers has started an exciting new era of black hole astrophysics.
Understanding the possible formation channels of the population of BBH will be important to understand the environment in which such systems are formed. Hence, the recent detections prove that BBHs exists in nature and merge within Hubble time, and so there is a strong motivation to search for BBH systems in a larger parameter space, such as BBH with intermediate masses (IMBBH) and residual eccentricity till the time of merger (eBBH). Detection or rate upper limits on IMBBH or eBBH will extend the understanding of the formation channels and black hole astrophysics.
The search for such sources is conducted using both templated search with extended template bank to IMBBH and un-modelled searches tuned to IMBBH and eBBH. We present here the methods and results for the searches concerning IMBBH and eBBH, also present the results of the search for IMBBH in the first observational run of the LIGO detectors where no detections were made but very interesting rate upper limits were obtained.Speaker: Shubhanshu Tiwari (INFN - National Institute for Nuclear Physics)
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Flavour and symmetries Room Mosaici-2 (Palazzo del Casinò)
Room Mosaici-2
Palazzo del Casinò
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14:30
Charm Physics: Theory status and window to New Physics 30m
Motivated by the possible signals of lepton number violation in B physics, known as RD(*) and RK, RK$^*$ puzzles, we investigate whether
charm physics might offer a window to New Physics, too.
Relying on the existing lattice QCD and experimental results on charm leptonic and semileptonic weak decays, one can question presence of NP in the charge current transitions.
One can constrain the NP effects in differential decay width distributions, forward-backward asymmetry in $D\to K l\nu$.
The NP might affect flavour changing neutral current transitions as charm meson oscillations and rare charm decays.
We present constraints on NP parameters for a few representative models of NP, as new vector gauge bosons, leptoquarks and THDM.
Possible tests of lepton flavour universalities are discussed.
The effects of Dark Matter particles in charm mesons are investigated too.Speaker: Svjetlana Fajfer (Univ. of Ljubljana and Inst. J. Stefan) -
15:00
Charm and CP violation measurements from the LHC 30m
Measurements of CP- and flavour-violating transitions of charm and beauty hadrons are very powerful probes for physics beyond the standard model, that are complementary to the direct searches performed at the energy frontier. Experiments at the LHC are, since the start of Run 1 (2011-2012) playing a crucial role in this sector. The most recent highlights from LHCb, ATLAS and CMS are presented, based on both Run 1 and Run 2 (2015-) data, and prospects for the future are discussed.
Speaker: Angelo Di Canto (CERN) -
15:30
Charm meson physics at BESIII 30m
The BESIII Experiment at the Beijing Electron Positron Collider
(BEPCII) accumulated the world's largest e+e- collision samples
at Ecm = 3.773, 4.009, 4.18 GeV. Based on analyses of D(s)+ to l+v
(l=mu, tau), D -> K(pi)l+v (l=e or mu), D+ -> K-pi+e+v, D0(+) ->
f0(980)e+v, Ds+ -> eta(')e+v, we report the determinations of CKM
matrix elements |Vcs(d)|,the D(s)+ decay constants, the form factors
of D semi-leptonic decays. These are important to calibrate the LQCD
calculations of decay constant and form factors and to test the CKM
unitarity. Using the quantum correlation property of D0D0-bar
production, we determine the parameters of the strong phase difference
and D0D0-bar mixing. We will also report some preliminary results for
Ds+ decays to omega pi+,omega K+ and pn.Speaker: Jiangchuan Chen (IHEP, P.R. China) -
16:00
Coffee break 30m
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Time-dependent CP violation in the B system at LHCb 15m
Time-dependent CP-violation measurements allows to determine the mixing-induced CP-violating phases phi_s and beta. The measurement of the phase phi_s in the Bs-Bsbar system is one of the key goals of the LHCb experiment. It has been measured at LHCb exploiting the Run I data set and using several decay channels. In particular, the most recent Run I results that will be presented at this conference, have been obtained analyzing Bs0->J/psi(->mu+mu-) K+K- candidates in the mass region above the phi(1020) resonance and Bs0 -> Psi(2S) phi candidates.
Moreover, new results of time-dependent CP violation studies of b->ccbar d/s decays by the LHCb experiment are presented. Namely, a new measurement of CP-violation in the B0-B0bar system using B0->psi(2S) KS0 and B0->J/psi(->e+e-) KS0 decays with Run-I data sample will be shown for the first time.Speaker: Sevda Esen (Ruprecht-Karls-Universitaet Heidelberg (DE)) -
16:45
CP violation in b baryons at LHCb 15m
The violation of CP symmetry is well established nowadays in the K and B mesons sectors. However CPV has not been observed in the baryonic sector. Charmless b-baryon decays represent a promising opportunity in this respect since their amplitudes receive contributions from tree level diagrams where the CKM element Vub appears. In addition, these decays are sensitive to possible physics beyond the SM, since they receive relevant contributions also from penguin topologies. We present the most recent measurements of charmless b-baryon decays performed by LHCb, including branching ratios and T-odd correlations.
Speaker: Rafael Silva Coutinho (Universitaet Zuerich (CH)) -
17:00
Rare radiative charm decays in the standard model and beyond 15m
Rare charm decays offer a unique window to probe the up-type sector in flavor physics.
Motivated by the recent Belle measurement of the decay $D^0\to\rho^0\gamma$ we investigate its standard model contribution as well as physics beyond the standard model (BSM).
We study observables of rare radiative charm decays which are testable at colliders and identify possible effects BSM, in particular within leptoquark and supersymmetric models.Speaker: Stefan de Boer -
17:15
Searches for rare charm decays at LHCb 15m
Following the hints for deviations from the Standard Model in rare B meson
decays, searches for rare and forbidden decays of charmed hadrons become a hot
topic again. We present recent results on rare D0 and Lc decays.Speaker: Dominik Stefan Mitzel (Ruprecht-Karls-Universitaet Heidelberg (DE)) -
17:30
SU(3)f Breaking through Final State Interactions and CP Asymmetries in $D\to P P$ Decays 15m
The question of the validity of analyzing charmed meson decays to pairs of mesons within the $SU(3)_F$ framework has been long and often debated. There are convincing arguments that small breaking of this symmetry can accommodate for the current experimental data on branching fractions of $D\to P P$ ($P=\pi,K,\eta$). However, the uncertainty in the evaluation of the amplitudes in these modes renders it quite impossible to justify with complete authority the physical interpretations of the parameters extracted from experimental data. In our current work we build a parametrization of perturbative $SU(3)_F$ breaking in an attempt to incorporate final state interactions through isospin specific phases and small breaking in the amplitudes. We use a reduced menu of decay modes consisting of the $D^0$ and $D_{(s)}^\pm$ initial states and excluding $\eta/\eta^\prime$ in the final states in an initial attempt to explain the branching fractions data with our parametrization. We also incorporate CP non-conservation in our parametrization which requires the knowledge of poorly estimated penguin amplitudes. We attempt at estimating $\Delta{\rm A}_{\rm CP}^{\rm dir}$, and build its correlation with several other CP asymmetries using our parametrization making predictions which are testable at Belle II and LHCb.
Speaker: Ayan Paul (INFN, Sezione di Roma) -
17:45
CP Violation sensitivity at the Belle II Experiment 15m
The measurement of the time-dependent CP violation parameters for B-meson decays is crucial for tightening the constraints on the unitarity triangle and for the search of new physics beyond the Standard Model.
A clean environment for the study of B decay channels is provided by B-factories. With a design luminosity of 8 · 10^35 cm^−2s^−1, leading ultimately to an integrated luminosity beyond 50 ab^−1, the new B-factory SuperKEKB will exceed the record instantaneous luminosity of its predecessor KEKB by a factor of 40. The new Belle II detector will exploit the expected high statistics data sample thanks to a major upgrade of the tracking system, including a novel pixel vertex detector in its innermost part. Additionally, the detector capabilities will be complemented by substantial improvements in the reconstruction software.
We develop a strategy for CP violation analysis in order to maximally exploit the new data set and to characterize the sensitivity of Belle II for various benchmark B decay channels.
Speakers: Alessandro Morda (CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France), Alessandro Mordà (INFN - National Institute for Nuclear Physics) -
18:00
Unitarity Triangle Analysis and D meson mixing in the Standard Model and Beyond 15m
We present the current status of the Unitarity Triangle Analysis in the Standard Model and in the presence of New Physics, as well as a global analysis of D meson mixing data. Based on these results, we obtain constraints on New Physics in Delta F = 2 processes and present bounds on the scale of New Physics.
Speakers: Luca Silvestrini (INFN Rome), Marcella Bona (Queen Mary University of London (UK)) -
18:15
Recent measurements of branching fractions and CP asymmetries of charmless hadronic B meson decays at Belle 15m
Hadronic $B$ decays without a charm quark constitute a powerful probe to search for
physics beyond the standard model as well as provide constraints of $CP$-violation
parameters. We report the final measurements from Belle of the branching fraction
and $CP$ asymmetry for the decays $B^{0}\to \pi^{0}\pi^{0}$, $B^{\pm}\to K^{+}K^{-}\pi^{\pm}$ and preliminary results for $B^\pm\to K^{0}_{S}K^{0}_{S}h^{\pm} (h =K,\pi)$ and $B^{\pm}\to \pi^{+}\pi^{-}\pi^{\pm}$. All investigations employ the full data sample delivered by the KEKB $e^{+}e^{-}$ collider. The $B^{0}\to \pi^{0}\pi^{0}$ measurements enable improved constraints on the angle $\phi_{2}$ of the CKM unitarity triangle. For $B^{\pm}\to K^{+}K^{-}\pi^{\pm}$ we measure $CP$ asymmetry as a function of the invariant-mass of the $K^{+}K^{-}$ system, where we find strong evidence for large direct $CP$-violation as well as a large increase in yield at low mass. This measurement challenges conventional theoretical approaches since the result requires a large enhancement in both tree and loop diagrams in the same small region of phase-space. The three-body decay final states $\pi^{+}\pi^{-}\pi^{\pm}$ and $K^{0}_{S}K^{0}_{S}h^{\pm} (h=K,\pi)$ proceed mostly via flavor-changing neutral currents and are thus sensitive to new physics via enhanced $CP$-asymmetry due to interference from non-SM amplitudes in loops. The final measurement plays an important role in understanding the $B$ decay dynamics and improving the deviation boundary of $\sin 2\phi_1$ obtained in $b\to c\bar{c}s$ and $b\to sq\bar{q}$ decays.Speaker: Abdul Basith Kaliyar (IIT Madras) -
18:30
Search for CP violation and rare decays in charm sector at Belle 15m
Using more than $920 {\rm fb}^{-1}$ data collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we report the first measurement of the T-odd moments in the decay $D^0 \to K_S^0 \pi^0 \pi^+ \pi^-$ and the first observation of the radiative charm decay $D^0 \to \rho^0 \gamma$. We search for CP-violation in decays $D^0 \to K_S^0 K_S^0$, $D^+ \to \pi^+ \pi^0$, $D^0 \to \omega \gamma$ and $D^0 \to K^* \gamma$. All the results are consistent with no CP violation. We also report the result from the first search for $D^0$ decays to invisible final states. No significant signal yield is observed and an upper limit is set on the branching fraction at 90\% confidence level.
Speaker: Minakshi Nayak (Indian Institute of Technology Madras)
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Higgs and new physics: Future Colliders Sala Perla (Palazzo del Casinò)
Sala Perla
Palazzo del Casinò
Convener: Paolo Meridiani (Universita e INFN, Roma I (IT))-
14:30
The Potential of the ILC for Discovering New Particles 15m
The LHC did not discover new particles beyond the Standard Model Higgs boson at 7 and 8 TeV, or in the first data samples at 13 TeV. However, the complementary nature of physics with e+e- collisions still offers many interesting scenarios in which new particles can be discovered at the ILC. These scenarios take advantage of the capability of e+e- collisions to observe particles with missing energy and small mass differences, to observe mono-photon events with precisely controlled backgrounds, and to observe the full range of exotic decay modes of the Higgs boson. The searches that an e+e- collider makes possible are particularly important for models of dark matter involving a dark sector with particles above the modest energy reach of fixed-target experiments. In this talk, we will review the opportunities that the ILC offers for new particle discovery.
Speaker: Jenny List (Deutsches Elektronen-Synchrotron (DE)) -
14:45
Higgs and BSM physics at CLIC 15m
The Compact Linear Collider (CLIC) is an option for a future
electron-positron collider operating at centre-of-mass energies from a
few hundred GeV up to 3 TeV. This contribution discusses the Higgs and
BSM physics reach of CLIC operating in several energy stages. The
presented results are based on physics benchmark analyses using full
detector simulations, several of which have been completed recently.
The initial stage of operation near the top quark pair production
threshold allows to study Higgs boson production in the Higgsstrahlung
and WW-fusion processes, resulting in model-independent determinations
of the Higgs couplings. High-energy operation, here assumed at 1.4 and 3
TeV, gives access to rarer Higgs decays and production processes such as
double Higgs production, which is sensitive to the Higgs self-coupling.
In the second part of the presentation, examples for direct and indirect
new physics searches are given. In both cases, the achievable
sensitivities generally rise with the centre-of-mass energy.Speaker: Gordana Milutinovic-Dumbelovic (University of Belgrade (RS)) -
15:00
Probing Chirality of Top-Higgs FCNC Couplings at Linear Colliders 15m
We study the nature of the flavor changing neutral couplings of the top quark with the Higgs boson and the up/charm quark in the tt¯ production at linear colliders. There are previous bounds on such tqH couplings at both, linear and hadronic colliders, with the assumption that it couples equally to the left and the right handed fermions. In this paper we examine the chirality of the tqH coupling and construct different observables which will be sensitive to it. It was found that in particular the off-diagonal basis can be useful to distinguish among the chiral tqH couplings. The sensitivity of the unpolarized ILC in probing the couplings at the 3σ level at s√ = 500 GeV and L = 500 fb−1 is also studied, resulting in predicted BR(t → qH) < 1.19 ×10−3. This limit is further improved to BR(t → qH) < 8.84 ×10−4 with the inclusion of initial beam polarization of left handed electrons and right handed positrons.
Speakers: Prof. Blazenka Melic (Rudjer Boskovic Institute, Zagreb), Blazenka Melic, Blazenka Melic (IRB, Zagreb), Blazenka Melic -
15:15
Precision Higgs Measurements at the 250 GeV ILC 15m
The plan for the International Linear Collider is now being prepared as a staged design, with the first stage at 250 GeV and later stages achieving the full project specifications with 4 ab-1 at 500 GeV. This talk will present the capabilities for precision Higgs boson measurements at 250 GeV and their relation to the full ILC program. It will show that the 250 GeV stage of ILC will already provide many compelling results in Higgs physics, with new measurements not available at LHC, model-independent determinations of key parameters, and tests for and possible discrimination of a variety of scenarios for new physics.
Speaker: Tim Barklow (SLAC National Accelerator Laboratory (US)) -
15:30
Higgs measurement at Future Circular Collider 15m
After the Higgs boson discovery, the precision measurements and searches for new phenomena in the Higgs sector are among the most important goals in particle physics. Experiments at the Future Circular Colliders (FCC) are ideal to study these questions. Electron-positron collisions up to an energy of 350 GeV (FCC-ee) provide the ultimate precision with studies of Higgs boson couplings, mass, total width and CP parameters, as well as searches for exotic and invisible decays. The feasibility of observation of the s-channel production e+e- → H(125) is reviewed. We conclude by noting the remarkable complementarity of the FCC-ee and FCC-hh colliders, which in combination offer the best possible overall study of the Higgs boson properties.
Speaker: Janna Katharina Behr (Deutsches Elektronen-Synchrotron (DE)) -
15:45
Higgs Physics at the LHeC and the FCC-eh 15m
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide electron-proton collisions with center-of-mass energies in the range 1.3-3.5 TeV and instantaneous luminosities larger than $10^{34}$ cm$^{-2}$s$^{-1}$. With integrated luminosities of about 1 ab$^{-1}$, they provide large samples of Standard Model Higgs bosons in both neutral and charged current reactions. In this talk, we present new results of both cut- and BDT-based extractions of the couplings to $b\bar b$ and $c \bar c$ based on a Delphes simulation of the detector. We will show how precisions 0.5 and 4 % respectively are possible at the LHeC, and present the corresponding projections for the FCC-eh. The status of the complete Higgs SM ep simulation program will be described, including also $\tau\tau$ and WW decays. We also comment on the impact of the reduced uncertainties in proton parton densities and $\alpha_s$ that can be achieved through ep for Higgs physics at the HL-LHC (pp).
Speaker: Dr Kechen Wang (DESY / IHEP)
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Higgs and new physics: Supersymmetry Room Welles (Palazzo del Casinò)
Room Welles
Palazzo del Casinò
Convener: Radovan Dermisek-
14:30
Searches for electroweak production of supersymmetric gauginos and sleptons with the ATLAS detector 15m
Many supersymmetry models feature gauginos and also sleptons with masses less than a few hundred GeV. These can give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents results from searches for gaugino and slepton pair production in final states with leptons, and were performed with pp collisions at a centre-of-mass energy of 13 TeV.
Speaker: Zinonas Zinonos (Max-Planck-Institut fur Physik, München (DE)) -
14:45
Search for electroweak production of supersymmetry at CMS 15m
We report on searches for supersymmetry via pair production of partners of electroweak gauge and Higgs bosons. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
Speaker: Miaoyuan Liu (Fermi National Accelerator Lab. (US)) -
15:00
Search for supersymmetry in events with photons at CMS 15m
We report on searches for new physics in events with at least one photon, jets and missing transverse energy. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
Speaker: Marc Gabriel Weinberg (Carnegie-Mellon University (US)) -
15:15
Search for R-parity violating supersymmetry with the ATLAS detector 15m
R-parity violation introduces new signatures to be considered in the search for supersymmetry at the LHC. Strongly interacting resonances may decay to jets, sleptons may decay via lepton-flavour violating processes and lightest supersymmetric particles may decay into many particles with or without missing transverse momentum. The talk presents recent results from searches of supersymmetry in resonance production and R-parity violating signatures with the ATLAS detector.
Speaker: Sascha Mehlhase (Ludwig-Maximilians-Univ. Muenchen (DE)) -
15:30
First SUSY results with GAMBIT 15m
I will present the first global fit results for supersymmetric models using the new Global And Modular BSM Inference Tool (GAMBIT). With GAMBIT we have performed fits of the GUT-motivated CMSSM, NUHM1 and NUHM2 models, as well as the weak-scale MSSM7, extending existing results in terms of the number of observables included, scanning techniques and treatment of nuisance parameters.
Speaker: Anders Kvellestad (Nordita) -
15:45
On the Coverage of the pMSSM by Simplified Model Results 15m
ATLAS and CMS have performed a large number of searches for physics beyond the Standard Model (BSM). The results of SUSY searches are typically interpreted in the context of Simplified Models. While mass limits obtained in this manner are highly model dependent, cross section upper limits (or efficiency maps) may be used to obtain constraints on generic BSM scenarios without any further event and detector simulation. This procedure has been automatised in the public tool SModelS, which first decomposes the generic scenario into Simplified Model components that can then be tested directly against the results in the SModelS database. I will briefly introduce SModelS and then discuss how the coverage by Simplified Model results compares to what can be obtained in a full simulation study for the example of the 19 parameter phenomenological MSSM (pMSSM). Considering all parameter points that ATLAS has tested in a comprehensive study (see arXiv:1508.06608), we find that about 50% of the points excluded by ATLAS can be excluded from Simplified Model constraints. This fraction could be improved by considering currently 'missing' Simplified Model topologies and I will show examples of parameter space regions where the coverage is significantly improved if we add Simplified Model topologies not considered by the experiments. Finally we characterise scenarios that do not map onto Simplified Model components.
Speaker: Ursula Laa (LPSC Grenoble) -
16:00
Coffee break 30m
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Search for the decay of the Higgs boson into two nMSSM pseudo-scalar particles. 15m
The next to MSSM theory predicts the existence of a light pseudoscalar boson "a", and the decay of the Higgs boson into a pair of such particles. This scheme is searched for in several final states relative to different decay modes of the "a" particle, using about 10 fb-1 of p-p collisions at 13 TeV.
Speaker: Michel Janus (Georg-August-Universitaet Goettingen (DE)) -
16:45
Status and discovery prospects for light pseudoscalars in the NMSSM 15m
While most BSM searches at the LHC focus on heavy new states, the NMSSM contain the possibility of new light states that have escaped detection due to their singlet nature.
Here we focus on light pseudoscalars, investigating the parameter space impact of recent LHC searches for such light states stemming from the decay of the 125 GeV Higgs boson. It is shown that, though direct searches can not yet compete with the requirement of the 125 GeV scalar having SM-like couplings, the searches are touching the allowed parameter space and should make a phenomenological impact in the near future.
Speaker: Nils-Erik Bomark -
17:00
Perspectives for SUSY in light of current LHC constraints 15m
We present the current perspectives for SUSY at the LHC Run-II and at future colliders in the SU5, mAMSB and in a phenomenological Minimal Supersymmetric Standard Model scenarios with eleven parameters (pMSSM11). Our study includes the most important limits on SUSY coming from searches at runs 1 and 2 of the LHC, as well as the compatibility with the observed Higgs signal and the constraints coming from electroweak precision data and flavor physics.
Cosmological data and direct searches for dark matter are also taken into account. Particular attention has been given to the impact of the constraint coming from the current measurement of muon anomalous magnetic moment.Speaker: Diego Martinez Santos (U. Santiago de Compostela) -
17:15
Naturalness and light Higgsinos: why ILC is the right machine for SUSY discovery 15m
Radiatively-driven natural Supersymmetry, a theoretically and experimentally well-motivated framework, centers around the predicted existence of four light, nearly mass-degenerate Higgsinos with mass $\sim 100-200$ GeV (not too far above $m_Z$). Their small mass splittings of at most 20 GeV implies very little visible energy of accompanying Standard Model particles decayed from heavier Higgsinos. Given that other SUSY particles are considerably heavy, this makes detection challenging at hadron colliders. On the other hand, the clean environment of an electron-positron collider with $\sqrt{s}>2m_{Higgsino}$ would enable a decisive search of these required Higgsinos, and thus either the discovery or exclusion of natural SUSY. We present a detailed simulation study of precision measurements of Higgsino masses and production cross sections at $\sqrt{s}$ = 500 GeV of the proposed International Linear Collider currently under consideration for construction in Japan. The study is based on a Geant4 simulation of the International Large Detector concept. We examine several benchmark points just beyond the HL-LHC reach, with a mass spectrum containing four light Higgsinos directly accessible by the ILC, and the mass differences between the lightest SUSY particle and the heavier states ranging from about 4 to 20 GeV. It can be shown that their masses and production cross sections are able to be precisely measured to approximately 1% precision or better. These precise measurements allow for extracting the underlying weak scale SUSY parameters. The fitted parameters give predictions for the masses of heavier SUSY states, which provide motivation for future high-energy colliders. Additionally, dark matter properties may be derived. Evolution of the measured gaugino masses to high energies should allow one to distinguish the hypothesis of gaugino mass unification from other compelling possibilities such as mirage mediation.
Speakers: Ms Suvi-Leena Lehtinen (DESY), Suvi-Leena Lehtinen (DESY) -
17:30
The Fine-tuning of the Minimal Supersymmetric Standard Model: Constraints by the LHC, Future Colliders and Dark Matter searches 15m
We evaluate the fine-tuning of the phenomenological minimal supersymmetric standard model (pMSSM). We show that the fine-tuning of the pMSSM is not large yet, nor under pressure by LHC searches. We also determine GUT scale models with the same low fine-tuning.
Low sbottom, stop and gluino masses turn out to be less relevant for low fine-tuning than commonly assumed. Fine-tuning arguments point to models with a dark matter candidate yielding the correct dark matter relic density: a bino-higgsino particle with a mass of 35−155 GeV. We show how upcoming searches at the LHC , with Dark Matter detection experiments and at future colliders will constrain the fine-tuning of the MSSM. In addition we briefly discuss the relevance of Machine Learning in recasting LHC limits (SUSY-AI project).Speaker: Sascha Caron (Nikhef National institute for subatomic physics (NL)) -
17:45
The muon g-2 and dark matter in the MSSM at 100 TeV 15m
We study the muon g-2 and neutralino dark matter as explained by the MSSM where the squarks and 3rd generation sleptons are decoupled. Particularly, we focus on constraints from current and future dark matter experiments such as PandaX-II and LUX-2016 as well as current bounds from collider searches. Using the constraints on the MSSM from the muon g-2 and DM searches, we study constraints from multilepton + MET searches at 8 TeV LHC, and the prospects for searches at 100 TeV proton-proton collision energies.
Speaker: Matthew Talia (University of Sydney) -
18:00
Muon g-2 and dark matter in models with vector-like fermions 15m
We analyze the phenomenological status of several models of BSM physics explaining the muon g-2 anomaly and the relic density of dark matter. We consider scenarios requiring extra vector-like matter, some of which are based on supersymmetry. We confront the models with the latest bounds from the LHC 14 TeV run, direct and indirect searches for dark matter, and precision tests of the electroweak theory, highlighting viable regions of the parameter space and expected signatures in future experiments.
Speaker: Enrico Maria Sessolo (NCBJ, Warsaw) -
18:15
Effects of Extra Yukawa Couplings and Alignment 15m
The two Higgs doublet model without any ad hoc symmetries, in general should have extra Yukawa interactions which cause exotic interactions such as flavor changing neutral processes. Effects of the extra Yukawa interactions can also appear in
couplings of the 125 GeV Higgs boson ($h$) via fermion loop contributions. In this talk, we calculate the $hZZ$ coupling expected to be measured with $\mathcal{O}(1) \%$ accuracy at future lepton collider experiments, at the one-loop level by the on-shell renormalization scheme, and evaluate how the $hZZ$ coupling depends on the mass of extra Higgs bosons and the extra Yukawa coupling $\rho_{tt}$. We find that if $\rho_{tt} \cos\gamma < 0$, where $\gamma$ is a mixing angle of CP-even Higgs bosons, the $\rho_{tt}$ effect induced top loop contribution cancels extra Higgs boson loop contributions and one may have alignment without decoupling, but exotic scalar bosons could have masses at several hundred GeV. We also discuss whether future precision coupling measurements can give stronger bound on $\rho_{tt}$ than the current bound from flavor experiments.Speaker: Dr Mariko Kikuchi
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Heavy ion physics Room Mangano (Palazzo del Casinò)
Room Mangano
Palazzo del Casinò
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Jets in QGP 30m
I will review the recent developments in the understanding of the dynamics of jets that propagate through QGP with particular emphasis on jet substructure. I will argue that substructure observables provide a novel direction in quenching studies.
Speaker: Dr Guilherme Teixeira De Almeida Milhano (LIP-Lisbon & CERN TH) -
15:00
Jet production in Pb-Pb collisions in ALICE 15m
High energy collisions of heavy nuclei permit the study of nuclear matter at temperatures and energy densities. Under these conditions the fundamental theory for strong interactions, QCD, predicts a phase transition to a plasma of quarks and gluons. This matter, called a Quark Gluon Plasma (QGP), has been studied experimentally for the last decade and has been observed to be a strongly interacting liquid with a low viscosity. High energy partons created early in the collision interact with the QGP and provide unique probes of its properties. Studies of these partons through full jet reconstruction and high-momentum particles have demonstrated that the QGP is a strongly interacting, dense medium. Studies of jet-hadron correlations and jet structure can help understand the energy loss mechanism.
We present measurements of jet spectra, jet structure, and jet-hadron correlations in Pb--Pb collisions and discuss the constraints these studies place on partonic energy loss mechanisms in the medium.
Speaker: Christine Nattrass (University of Tennessee (US)) -
15:15
Jet measurements in heavy-ion collisions with the ATLAS detector 15m
In relativistic heavy-ion collisions, a hot medium with a high density of unscreened colour charges is produced. Jets are produced at the early stages of this collision and are known to become attenuated as they propagate through the hot matter. One manifestation of this energy loss is a lower yield of jets emerging from the medium than expected in the absence of medium effects. Another manifestation of the energy loss is the modification of the dijet balance and the modification of fragmentation functions. In this talk, the latest ATLAS results on single jet suppression, dijet suppression, photon-jet correlations, and modification of the jet internal structure in Pb+Pb collisions will be presented.
Speaker: Martin Spousta (Charles University) -
15:30
Jet evolution in a dense medium: event-by-event fluctuations and multi-particle correlations 15m
We study the gluon distribution produced via successive medium-induced branchings
by an energetic jet propagating through a weakly-coupled quark-gluon plasma. We show that
under suitable approximations, the jet evolution is a Markovian stochastic process,
which is exactly solvable. For this process, we construct exact analytic solutions
for all the n-point correlation functions describing the gluon distribution
in the space of energy [1,2]. Using these results, we study the event-by-event distribution of the energy lost by the jet at large angles and of the multiplicities
of the soft particles which carry this energy. We find that the event-by-event fluctuations are huge: the standard deviation in the energy loss is parametrically as large as its mean value [1]. This has important consequences for the phenomenology
of di-jet asymmetry in Pb+Pb collisions at the LHC: it implies that the fluctuations in the branching process can contribute to the measured asymmetry on an equal footing with the geometry of the di-jet event (i.e. as the difference between the in-medium path lengths of the two jets). We compute the higher moments of the multiplicity distribution and identify a remarkable regularity known as Koba-Nielsen-Olesen (KNO) scaling [2].These predictions could be tested via event-by-event measurements of the di-jet asymmetry.
References
[1] Event-by-event fluctuations in the medium-induced jet evolution
M. Escobedo, E. Iancu, e-Print: arXiv:1601.03629 [hep-ph], JHEP 1605 (2016) 008.[2] Multi-particle correlations and KNO scaling in the medium-induced jet evolution
M. Escobedo, E. Iancu, e-Print: arXiv:1609.06104 [hep-ph], JHEP 1612 (2016) 104.Speaker: Dr Miguel Ángel Escobedo Espinosa (University of Jyväskylä) -
15:45
Radiative energy loss in absorptive medium 15m
Understanding the energy loss of strongly interacting particles is of utmost importance for studying the quark‐gluon plasma (QGP). This very hot and dense state of matter is created during heavy‐ion collisions, like the ones performed at the LHC. As the lifetime of the QGP is very brief, special probes are necessary to study it. One of them consists in focusing on the energy loss of energetic quarks or gluons (so-called partons) created in the early stages of the collision. These partons go through the QGP and are sensitive to all its development. One can then compare the energy spectrum of this kind of particles after going through the QGP or after going through usual nuclei and learn features of the QGP by comparison. For this it is important to master theoretically the energy loss of these partons.
A particle can loose energy either by collisional processes (diffusion in the medium) or by radiative mechanisms (bremsstrahlung). The emission of a gluon takes a certain amount of time called the formation time. In the medium, this time can be longer than the mean free path of the particle leading to the LPM effect and a modification of the emission spectrum. But what if during its formation the gluon emits other gluons in turn. One phenomenological way to deal with this effect is to associate a damping rate to the first emitted gluon, and then investigate the consequences on its parent parton energy loss.
In this presentation, we use the formalism developed in [1] to study the in-medium radiation by energetic quarks or gluons. In this formalism the propagation of a parton and its elastic scatterings with the medium is driven by a two-point correlator of the gluon field in the medium. We examine the modification of the two-point correlator for collisions that are accompanied by bremsstrahlung gluons that are sufficiently soft so as to be formed before the next interaction, and study whether this leads to a damping scenario.
[1] Blaizot et al, JHEP01(2013)143Speaker: Alexandre Parent du Chatelet -
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Coffee break 30m
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Color coherence in multiple antenna medium radiation 15m
We present the con?guration in which a quark-antiquark pair with a fi?xed opening
angle emits a hard gluon inside a medium, and an additional very soft emission afterwards (double antenna). We discuss the coherence effects in terms of the survival probability, which describes the interaction of the quark-antiquark-gluon system with the medium. We generalize previous studies of the antenna radiation to the case of more than two emitters and prove that this generalization provides further support to the picture of jet quenching with effective emitters in the parton cascade. Our results de?finitely conclude that the results from the antenna setup (two emitters) can be easily generalized to the case of more than two emitters. These computations go a step forward to obtain a complete description of a QCD cascade.Speaker: Víctor Vila (Universidade de Santiago de Compostela) -
16:45
Central-forward dijets in Pb-Pb collisions in high energy factorization 15m
We report on double inclusive jet production in Pb-Pb collision within newly constructed framework combining High Energy Factorization with mechanism for energy loss in Quark Gluon Plasma. The framework allows for exact treatment of kinematics of colliding partons and therefore to increase accuracy in studies of energy loss of jets in quark gluon plasma. Furthermore the chosen configuration of jets i.e. forward-central configuration allows for analysis of rapidity structure of quark gluon plasma.
Speaker: Michal Deak (Polish Academy of Sciences (PL)) -
17:00
Measurement of very forward jets in p-Pb data at CMS 15m
We present results on the measurement of very forward jets in p-Pb data with the CASTOR calorimeter in the CMS experiment at 5 TeV.
Speaker: Pierre Van Mechelen (University of Antwerp (BE)) -
17:15
Neutral pion - hadron correlations in pp and Pb–Pb collisions measured at the ALICE experiment 15m
The study of the azimuthal correlation with $\pi^0$ offers a powerful way to investigate the properties of strongly-interacting matter created in ultra-relativistic heavy-ion collisions.
In this talk, we present the measurement of two-particle correlations of $\pi^0$ trigger particles with associated charged particles versus azimuthal angle difference ($\Delta\varphi$) in pp and central Pb–Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV with the ALICE experiment. $\pi^0$ are detected by the ALICE electromagnetic calorimeter EMCal for transverse momenta 8<$p_{\rm T}$<16 GeV/c, and charged particles are measured by the ALICE main tracking detectors ITS and TPC for 0.5<$p_{\rm T}$<10 GeV/c, both at mid-rapidity.
The extracted per-trigger yield modification factors ($I_{AA}$) on the near and away side are compared with the expectations from theoretical models. The measurement is sensitive to the modifications of the medium modified fragmentation pattern in the QGP.
Speaker: Xinye Peng (Universita e INFN, Padova (IT)) -
17:30
Heavy ions at the Future Circular Collider 15m
This presentation will review the projected accelerator performance and the physics opportunities for a heavy-ion programme at FCC-hh [1]. In addition, the status of the FCC-hh detector design studies will be discussed.
The FCC-hh Design Study will assess the feasibility and potential of a hadron collider with a centre-of-mass of 100 TeV for pp collisions.
Operating FCC-hh with heavy-ion beams would provide Pb-Pb and p-Pb collisions at center of mass energy of 39 and 63 TeV per NN pair, respectively. Current estimates indicate that a luminosity of about 30/nb could be integrated during a one-month Pb-Pb run, that is more than one order of magnitude above the maximum projections for the LHC. The FCC-hh beams could also be used for fixed-target collisions, either with beam extraction or gaseous target.
The Quark-Gluon Plasma state produced in Pb-Pb collisions at 39 TeV is expected to have initial temperature and energy density substantially larger than at LHC energy, a stronger flow field and freeze-out volume twice as large. The larger temperature could entail novel features, like e.g. abundant in-medium production of charm quarks. The latter could determine an increase in the number of degrees of freedom of the QGP and provide a new tool to study its temperature evolution. New, rarer, hard probes would be available, like boosted top quarks, which could give access to the time-evolution of the medium opacity.
The physics of high gluon densities at small Bjorken-x and the onset of saturation can be studied using pA, AA, and γA collisions. The FCC-hh will provide access to the region down to x<10−6 with perturbative probes like heavy quarks and quarkonia and to the region of high Q2 down to x∼10−4 with W, Z and top. High-energy photon-photon interactions in ultraperipheral AA collisions will also enable the study of very rare processes such as light-by-light scattering and γγ→W+W−.
[1] A. Dainese et al., Heavy ions at the Future Circular Collider, arXiv:1605.01389
Speaker: Carlos Albert Salgado Lopez (Universidade de Santiago de Compostela (ES)) -
17:45
Nuclear Dynamics probed in Electron-Ion Scattering at TeV Energies 15m
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide unique electron-lead collisions with center-of-mass energies in the range 0.8-2.2 TeV, and instantaneous luminosities around $10^{33}$ cm$^{-2}$s$^{-1}$ per nucleon that will result in luminous data samples of typically 10 fb$^{-1}$ per nucleon. In this talk, we illustrate the resulting unprecedented opportunity to resolve nuclear structure and dynamics in a hugely extended kinematic range. We present new results on the determination of the lead parton densities in the EPPS16 framework that already includes pPb data from the LHC. We then discuss the possible impact of ePb studies on the search for a new non-linear regime of QCD, those of saturated parton densities. Finally, we show the potential of the study of elastic vector meson production to determine saturation effects and to access the transverse profile of both nucleons and nuclei.
Speaker: Pasquale Di Nezza (INFN e Laboratori Nazionali di Frascati (IT)) -
18:00
Status of the CBM experiment at FAIR 15m
The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) will explore the phase diagram of strongly interacting matter in the regions of highest net-baryonic densities and moderate temperatures. The high beam intensities that will be delivered from FAIR's SIS-100 heavy-ion synchrotron and possible upgrades will enable addressing several physics cases: The equation-of-state at neutron star core densities, the onset of chiral symmetry restoration and the identification of a deconfinement phase transition at high $\mu_B$ as well as other new phases of strongly-interacting matter. The related observables include collective flow of hadrons, particle production at threshold energies, in-medium modifications of hadrons, fluctuations, and the production of dileptons, strangeness and charm.
The experiment will be based on detector systems capable of the high interaction and charged-particle rates that are pre-requisites of the programme, and include silicon tracking and micro-vertex detection, electron and muon measurement, hadron identification, and electromagnetic and zero-degree calorimentry. As most of the observables require full detector read-out for trigger decisions, the CBM experiment is based on delivering streamed detector data to a computing farm where on-line event reconstruction is performed based on time-stamped detector information.
The presentation will overview the physics cases of the CBM experiment and the detector concept chosen. The status of the technical developments and the timeline for the experiment to take shape will be discussed. The Silicon Tracking System will be addressed in somewhat more detail as the development and construction of this detector is essential for the day-1 physics.Speaker: Hans Rudolf Schmidt -
18:15
Prospects for the study of heavy-ion collisions at the NICA collider at JINR 15m
The main scientific goal of the NICA heavy-ion physics program
at JINR will be an experimental investigation of the properties of
nuclear matter under extreme conditions. A comprehensive scan
of the QCD phase diagram in the region of maximum baryon density
will be performed at NICA with ion beam species ranging from protons
to gold nuclei. Systematic measurements of the production of leptons,
hadrons, and light (hyper)nuclei will be conducted covering a wide range
of the event phase-space with the MPD and BM@N experiments in the
collider and fixed-target mode, respectively.
In my talk, an overview of the current status of the NICA project
realization will be given. I'll discuss the main physics cases
at NICA and briefly describe the elements of the detectors.
A theoretical motivation will be accompanied by results
of realistic Monte-Carlo simulation of the proposed experimental
setupsSpeaker: Dr Vadim Kolesnikov (Joint Institute for Nuclear Research (RU))
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Neutrino physics Room Casinò (Palazzo del Casinò)
Room Casinò
Palazzo del Casinò
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14:30
What cosmology can tell us about neutrinos 30m
Neutrinos deeply affect cosmological observables, both in the early Universe and at low redshift. Thanks to these fingerprints, cosmology can constrain neutrino properties such as the absolute neutrino mass scale.
In this talk I will review the up to date cosmological constraints on neutrino physics; I will also show how future galaxy surveys can potentially pin down the neutrino mass sum.
Speaker: Maria Archidiacono -
15:00
A Combined View of Sterile-Neutrino Constraints from CMB and Neutrino Oscillation Measurements 15m
We perform a comparative analysis of constraints on sterile neutrinos from the Planck experiment and from current and future neutrino oscillation experiments (MINOS, IceCube, SBN). For the first time, we express the Planck constraints on Neff and msterileeff from the Cosmic Microwave Background in the parameter space used by oscillation experiments using both mass-squared differences and mixing angles. In a model with a single sterile neutrino species and using standard assumptions, we find that the Planck data and the oscillation experiments measuring muon-neutrino disappearance have similar sensitivity. We also compare these constraints for the electron-neutrino sterile-neutrino mixing angle in a 1+1 model and discuss how to extend the analysis to a 2+1 flavour model.
Speaker: Pawel Guzowski (University of Manchester) -
15:15
Status and commissioning of the KATRIN experiment 15m
The goal of the KArlsruhe TRItium Neutrino experiment (KATRIN) is to investigate the neutrino mass with a sensitivity of $0.2\,\mathrm{eV/c^{2}}$ by a high-resolution and high-statistics measurement of the end-point region of the $^{3}$H $\beta$-spectrum. The $\beta$-electrons start in the windowless gaseous tritium source and go into a differential and a cryogenic pumping section. These components magnetically guide the $\beta$-electrons, while reducing the $^{3}$H flow to a negligible level. The energy of the $\beta$-electrons is then analyzed by two electrostatic spectrometers based on the MAC-E filter technique and detected by a multi-pixel silicon semiconductor detector.
At the experimental site at the Karlsruhe Institute of Technology (KIT), all major components have arrived by summer 2015 and the complete beam line has been assembled. The inauguration of the full beam line, the "FirstLight", took place in October 2016 and was followed by a "FirstLight+" commissioning campaign, that finished in December 2016.
This talk gives an overview of the current status of the KATRIN experiment, the recent "FirstLight+" campaign and the upcoming steps towards the first tritium measurements planned for the beginning of 2018.
Speaker: Philipp Ranitzsch (Universitaet Muenster) -
15:30
GERDA Phase II: recent results in the search for neutrinoless double beta decay 15m
The GERDA (GErmanium Detector Array) experiment, located at the Laboratori Nazionali del Gran Sasso, is searching for neutrinoless double beta ($0\nu\beta\beta$) decay of $^{76}Ge$. Since the end of 2015, in Phase II of the experiment, 35 kg of enriched high-purity germanium detectors are operated in liquid argon, that serves as cooling for the detectors as well as active shield against external radiation. The aim is a sensitivity on the $0\nu\beta\beta$ decay half-life larger than $10^{26}~$yr with about $100~$kg$\cdot$yr exposure and the lowest background level in the field of about $10^{-3}~$cts/(keV$\cdot$kg$\cdot$yr). In this talk, an overview of the analysis of the data collected so far will be presented with an emphasis on the background rejection techniques and their performance together with the half-life limit.
Speaker: Anna Julia Zsigmond (Max Planck Institute for Physics) -
15:45
The CUORE and CUORE-0 experiments at LNGS 15m
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay that has been able to reach the 1-ton scale. The detector consists of an array of 988 TeO2 crystals arranged in a cylindrical compact structure of 19 towers. The construction of the experiment and, in particular, the installation of all towers in the cryostat was completed in August 2016 and commissioning started in fall 2016. The experiment has just completed the pre-operation phase and data taking is commencing. In this talk we will present the achievements of the CUORE construction phase and the performance of the detector during pre-operation. Physics results from CUORE-0, the first CUORE-style tower operated in 2013-2015, will also be updated.
Speaker: Claudia Tomei (INFN - National Institute for Nuclear Physics) -
16:00
Coffee break 30m
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The NEXT double beta decay experiment 15m
NEXT (Neutrino Experiment with a Xenon TPC) aims to observe the neutrinoless double beta decay of Xe-136 in a high-pressure gas xenon Time Projection Chamber using electroluminescence to amplify the signal from ionization. The two main advantages of this technology are a high energy resolution and the possibility of reconstructing the electron tracks in events with energies close to the Q-value of the decay to use it to distinguish signal (two electrons) from background (single electron).
NEXT-100 is an electroluminescent, asymmetric TPC which is going to host 100 kg of the Xe-136 isotope at 15 bar of pressure. On one side, a sparse array of photomultipliers records both the primary scintillation signal, which gives the starting time of the event, and the electroluminescence signal, which gives a precise measurement of the total deposited energy.
On the other side, a dense grid of silicon photomultipliers provides the reconstruction of the electron tracks. Being able of reconstructing the position of a track is doubly useful: one hand, it allows the correction of the energy of the event, which is distortioned according to the position, and on the other hand it provides an extra handle for background rejection, since a two-electron track and a single-electron track show higher energy density at both ends, and only at one end, respectively.After a protoyping period (2009-2014) NEXT has completed the construction and started the operation of its first phase (NEW) in the Canfranc Underground Laboratory, in the Spanish Pyrenees, with the objectives of measuring the NEXT background model and the two-neutrino mode of the double beta decay. In this talk I will describe the NEXT concept and present the latest results of the NEW detector.
Speaker: Paola Ferrario (Univ. of Valencia and CSIC (ES)) -
16:45
Physics and Commissioning of the SNO+ experiment 15m
The SNO+ experiment has multiple physics goals among which the search for neutrinoless double-beta decay, the study of solar neutrinos, measurements of anti-neutrinos from nuclear reactors and the Earth's natural radioactivity, as well as the detection of Supernovae neutrinos. Located in the SNOLAB underground physics laboratory (Canada) it re-uses the SNO detector equipped with ~9300 PMTs and looking at a 12 m diameter spherical volume. The detector will be filled with 780 tons of liquid scintillator to which 130Te at 0.5% loading will be added. The commissioning of the detector at SNOLAB has started with water fill data at the end of 2016. A short phase with the detector completely filled with water is on-going, before filling the detector with scintillator later this year. The neutrinoless double-beta decay sensitivity physics goals that SNO+ aims to achieve in phases with different loadings, as well as the physics plans for the water phase will be presented. A full review of the experiment present status and on-going commissioning in the water phase will also be given.
Speaker: Jack Dunger (University of Oxford) -
17:00
CUPID-0: a cryogenic calorimeter with particle identification for double beta decay search 15m
With their excellent energy resolution, efficiency, and intrinsic radio-purity, cryogenic calorimeters are primed for the search of neutrino-less double beta decay (0nDBD). The sensitivity of these devices could be further increased by discriminating the dominant alpha background from the expected beta like signal. The CUPID-0 collaboration aims at demonstrating that the measurement of the scintillation light produced by the absorber crystals allows for particle identification and, thus, for a complete rejection of the alpha background. The CUPID-0 detector, assembled in 2016 and now in commissioning, consists of 26 Zn82Se scintillating calorimeters for about 2x1025 0nDBD emitters. In this contribution we present the preliminary results obtained with the detector and the perspectives for a next generation project.
Speaker: Fabio Bellini (University of Rome) -
17:15
Search for neutrinoless double-beta decay with the SuperNEMO demonstrator 15m
Neutrinoless double-beta decay can provide evidence of lepton number violating processes and its observation can give information on the nature and the absolute mass scale of neutrinos. The SuperNEMO demonstrator searches for such decay through a tracking calorimeter technique which allows to disentangle different mechanisms for neutrinoless double beta decay with powerful background rejection capability. In this talk I will review the status of the experiment, being currently in its commissioning phase, and discuss its future perspectives.
Speaker: Dr Carla Macolino (LAL Orsay France) -
17:30
Production and radiative decay of heavy neutrinos at the Booster Neutrino Beam 15m
The MiniBooNE experiment reported results from the analysis of $\nu_e$ and $\overline{\nu}_e$ appearance searches, which showed an excess of signal-like events at low reconstructed neutrino energies with respect to the expected background. A proposed explanation for this anomaly is based on the existence of a heavy ($\sim 50$ MeV) sterile neutrino. These $\nu_h$ would be produced by $\nu_\mu$ electromagnetic interactions, through a transition magnetic dipole moment, and by neutral current interactions [1,2] on nuclei. A fraction of them decays radiatively inside the detector. The emitted photons are misidentified as electrons or positrons in MiniBooNE.
We have investigated the $\nu_h$ production by coherent and incoherent electroweak interactions on CH$_2$ and Ar targets, present in the MiniBooNE and the Short Baseline Neutrino (SBN) detectors (MicroBooNE, SBND and ICARUS) at Fermilab [3]. Following the $\nu_h$ propagation inside the detector we are able to obtain the energy and angular distributions of the final photons. Within the valid range of model parameters, we have obtained the best-fit parameters to describe the MiniBooNE excess of events. To further investigate this scenario, we have obtained the expected the signal at the SBN detectors. The distinctive shape and total number of photon events from this mechanism makes its experimental investigation feasible.
[1] S. N. Gninenko, Phys. Rev. D 83 (2011) 015015.
[2] M. Masip, P. Masjuan and D. Meloni JHEP 1301 (2013) 106.
[3] L. Alvarez-Ruso, E. Saúl-Sala, manuscript in preparation.
Speaker: Eduardo Saul Sala (Universidad de Valencia) -
17:45
New limits on heavy neutrino from NA62 15m
The NA62 experiment at CERN collected a large sample of charged kaon decays in flight with a minimum bias trigger in 2007. Upper limits on the rate of the charged kaon decay into a muon and a heavy neutral lepton (HNL) obtained from this data are reported for a range of HNL masses.
Speaker: Michal Koval -
18:00
Neutrino physics with the SHiP experiment at CERN 15m
SHIP is a new general purpose fixed target facility, whose Technical Proposal has been recently reviewed by the CERN SPS Committee and by the CERN Research Board. The two boards recommended that the experiment proceeds further to a Comprehensive Design phase in the context of the new CERN Working group "Physics Beyond Colliders", aiming at presenting a CERN strategy for the European Strategy meeting of 2019. In its initial phase, the 400GeV proton beam extracted from the SPS will be dumped on a heavy target with the aim of integrating 2×10^20 pot in 5 years. A dedicated detector will allow the study of neutrino cross-sections and angular distributions. ντ deep inelastic scattering cross sections will be measured with a statistics 1000 times larger than currently available, with the extraction of the F4 and F5 structure functions, never measured so far and allow for new tests of lepton non-universality with sensitivity to BSM physics.
Speaker: Marilisa De Serio (Universita e INFN, Bari (IT)) -
18:15
The search for sterile neutrinos at Future Circular Colliders 15m
Sterile neutrinos are among the most attractive extensions of the SM to generate the light neutrino masses observed in neutrino oscillation experiments.
When the sterile neutrinos are subject to a "lepton number"-like symmetry they can have masses around the electroweak scale and potentially large Yukawa couplings, which makes them testable at the planned Future Circular Colliders (FCC).
In this talk I present an overview of the sterile neutrino searches at the FCC in its electron-positron, proton-proton, or electron-proton configuration.
Therefore I provide a systematic assessment of the search channels,
give the state of the art sensitivities for the most promising signatures and discuss the synergy and complementarity of the different FCC configurations.Speaker: Mr Eros Cazzato (University Basel)
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Outreach, education, diversity Room Amici (Palazzo del Casinò)
Room Amici
Palazzo del Casinò
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14:30
Exhibition "The beginning of everything. About galaxies, quarks and collisions" 15m
The exhibition "The beginning of everything ", which runs from October 2016 to August 2017, has been created in collaboration between the Natural History Museum Vienna and the Institute of High Energy Physics (HEPHY) of the Austrian Academy of Sciences and was visited by more than 300 000 people including about 120 000 children and youth until mid-March2017. „The beginning of everything“ taking visitors on a journey more than 13 billion years back into the past, to the start of the universe, and by communicating most recent scientific knowledge of particle physics and cosmology in a readily comprehensible manner. Renowned Austrian artists such as B. Kowanz and artwork from the art@CMS project by M. Hoch offer a contrasting approach to this complex topic from different visual, optical and acoustic angles and perspectives.
Starting with our solar system and spectacular pictures of the stars and galaxies taken by the Hubble Space teleskop the visitor enters the very early universe where the particles become massive, protons and neutrons form and last but not least free electons combine with atomic nuclei to neutral atoms. The dominance of dark matter in the universe, matter/antimatter asymmetry as well as supersymmetry are also on focus. Accordingly, the most recent scientific findings and experiments are shown. Visitors can explore the world’s largest scientific experiment of CERN, and discover how fundamental science has changed the world as we know it. Hands-on exhibits for instance the „cosmic microwave background machine“, the interactive touch screen „Big Bang“, and the 1:20-scale model of the CMS-Detector makes the complex topic more understandable. The exhibition is accompanied by an extensive programme with lectures, guided tours with experts, matinees with artists, concerts, etc. Educational programmes for schools and kindergarten are offered. In addition, the fulldome show „The phantom of the universe“ (german version) will be shown at the NHM Planetarium.
Speaker: Jochen Schieck (Austrian Academy of Sciences (AT)) -
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Picturing diversity in the ATLAS Experiment 15m
With over 3,000 members from 178 institutes, the ATLAS Collaboration is naturally diverse. However, capturing this diversity through pictures can be a challenge. Photography is a powerful tool, allowing us to reveal the faces behind a story and give the public the unique opportunity to understand and appreciate the human aspects of ATLAS’s scientific research.
The role of photographs in portraying the diversity of the ATLAS Collaboration will be described. Their role on various communication platforms will be described and their impact examined, with focus on engagement of new audiences.Speaker: Silvia Biondi (Universita e INFN, Bologna (IT)) -
15:00
CREATIONS: Infusing creativity in science education through the arts 15m
Science education research suggests that STEM learning for young students may be especially enhanced through the combined use of inquiry and creativity in formal and informal settings. Consistent with the increasing emphasis on interdisciplinarity and the integration of the arts into STEM instruction (from STEM to STEAM), the CREATIONS initiative within the HORIZON-2020 framework brings together 16 partners from 10 European countries with the specific aim to spark young people’s interest in science and in following scientific careers through the design and implementation of a series of innovative activities grounded in a creativity-enriched inquiry-based science education pedagogical framework. Art is applied as a tool to make the non-visible world of high-energy physics (HEP) visible and to promote a long-lasting dialogue between basic science, the art world and educational communities for a greater appreciation and understanding of particle physics research and its contribution to society. As a good practice example, Science&Art@School was established as an education and outreach initiative (part of the art@CMS programme at CERN), that aims to act as an inspiring springboard for engaging the youth in the excitement of scientific research in HEP. By offering such synergies between the three actors, sparking school students’ interest in science and – on the long range – in choosing scientific careers is supposed to arise. This consequent bridging is based on an effective community of researchers, teachers and school students to empower sharing and exploiting innovatively the collective power of unique scientific resources. This talk will present examples of HEP-related education activities successfully implemented by various CREATIONS partners over the last two years, based on which implications for physics education research and practice will be identified.
Speaker: Dr Angelos Alexopoulos (CERN) -
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HEP interactive activities in high schools in the framework of the CREATIONS project 15m
CREATIONS is a three-year long European Union funded project, which aims to increase the young people’s interest in science. Sixteen partners from ten European countries develop creative approaches based on science and art for an engaging science classroom. The project is now in its 2nd year and a variety of events have already taken place. We have been developing advanced digital tools and educational scenaria in order to facilitate the introduction of HEP in high schools.
In the framework of CREATIONS we have performed a number of interventions in Greek schools which take the form of half-day masterclasses. The students, working in their schools’ computer labs, have the opportunity to use the inquiry based science education scenaria which have embedded tools for analysing data from the ATLAS experiment or discovering how the LHC works through playful learning. The work of students is monitored step by step by a specially designed integrated assessment system which consists of three different layers.
• A figurative test, delivered before and after the activity, to measure whether the students’ exposure to particle research has helped them recognize different patterns in the provided shapes.
• A set of assessment questions in each of the four phases of the scenario which uses as a reference the PISA 2012 Framework developed for the assessment of problem solving competence.
• A number of indicators embedded in the HYPATIA online analysis tool, which provide information about the ability of the students to understand and handle the complex analysis of short lived particle signatures in the state-of-the-art ATLAS detector.
The data analysis, which will be summarized, demonstrates that the interventions in the classrooms have followed the planned format (activities organisation, resources used, time devoted per inquiry phase). In addition the results provide clear indication that students involved are demonstrating deep involvement and high problem solving skills.Speaker: Christine Kourkoumelis (National and Kapodistrian University of Athens (GR)) -
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The Junior Community in ALICE 15m
The junior community in ALICE at the LHC, consisting of early-career scientists, forms an important and active body within the collaboration. It organizes a rich program with analysis tutorials and physics publication discussions. It also provides a collegial atmosphere for junior scientists to present their work and have lively discussions. In addition, the group is a vital element for junior scientists to strengthen their professional network and actively maintain bonds with current and previous members.
Any collaboration, including their decision-making bodies, can profit from the additional perspective which diverse groups offer. Within ALICE, the early-career scientists are represented in both its legislative and executive branches. A junior participant in every committee, formed to obtain input for various boards, ensures that junior viewpoints are taken into account. Such a junior representation is unique among the LHC experiments.
In this contribution, we discuss our experience with the junior community in ALICE from a junior and senior point of view. We present the various activities of this junior community and their positive impact on early-career scientists and the collaboration as a whole.
Speaker: Hans Beck (Ruprecht-Karls-Universitaet Heidelberg (DE)) -
15:45
The LHCb Starterkit initiative 15m
The vast majority of high-energy physicists use and produce software every day. Software skills are usually acquired "on the go'' and dedicated training courses are rare. The LHCb Starterkit is a new training format for getting LHCb collaborators started in effectively using software to perform their research. The initiative, combining courses and online tutorials, focuses on teaching basic skills for research computing, as well as LHCb software specifics. Unlike traditional tutorials we focus on starting with basics, performing all the material live, with a high degree of interactivity, giving priority to understanding the tools as opposed to handing out recipes that work "as if by magic". The LHCb Starterkit was started by two young members of the collaboration inspired by the principles of Software Carpentry, and the material is created in a collaborative fashion using the tools we teach. Three successful entry-level workshops, as well as two advance ones, have taken place since the start of the initiative in 2015, and were taught largely by PhD students to other PhD students.
Speaker: Albert Puig Navarro (Universität Zürich (CH)) -
16:00
Coffee break 30m
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Gender inclusive teaching. An experiment conducted at the CERN International High School Teacher Programme. First lessons learnt. 15m
Educational research has shown that girls are less likely than boys to take up science subjects in high school, in western countries, as shown e.g. by a UK study by the Institute of Physics. This has repercussions on professional choices made later.
For some years now CERN drives a variety of communication, education and outreach activities to encourage girls to take science subjects in school and women to enter in the field of STEM: through social media, presentations at schools and universities, and also through educational programmes.
More recently, CERN launched a raising-awareness initiative targeting high school teachers. A work group on gender inclusive teaching was introduced at the yearly CERN International High School Teachers programme. The aim of the work group is to explore, in a collaborative manner, with teachers from all around the world, and under the guidance of a researcher from the University of Geneva, aspects that may play a role in this gender imbalance early on at school. The underlying assumption is that, while most teachers have been trained to be teachers, inclusive teaching was not part of their curriculum.
The presentation will report on the 2016 work group, why and how it was set up, its limits and future. Sharing experience, addressing stereotypes reproduced in physics classes and other aspects that may influence students’ motivation were part of the group work. Teachers discussed, based on research findings and expert opinions, actions they can take to facilitate a gender inclusive classroom. The group was able to produce a document with recommendations that include the limitations set by the cultural diversity within the group and differences in national systems of education.
Speaker: Ms Kristin Kaltenhäuser (IT University Copenhagen) -
16:45
Early Career, Gender & Diversity Office at the LHCb experiment 15m
The LHCb Collaboration created an office with a mandate to advise and assist on issues related to Early Career, Gender & Diversity (ECGD) in September 2014.
This includes several activities within the Collaboration:- Helping early-career physicists succeed, both in Academia and outside HEP; e.g. setting up a mentoring programme within the collaboration, and organizing meetings with external speakers both within the collaboration and in conjunction with other experiments.
- Collating annual statistics on the gender balance in the collaboration as a whole and in management roles, and presenting them to the collaboration.
- Helping inform the collaboration about topics related to ECGD, including organising meetings within the collaboration and advertising related activities that are ongoing outside the collaboration.
- Listening to and advising colleagues who feel that they are the victims of harassment, discrimination, or other inappropriate behaviour.
This talk will present the activities and the experience of this office during the last few years.
Speaker: Olaf Steinkamp (Universitaet Zuerich (CH)) -
17:00
PROJECT JUNO: ADVANCING GENDER EQUALITY IN PHYSICS CAREERS IN HIGHER EDUCATION IN THE UK 15m
The Institute of Physics (IOP) has a longstanding interest in diversity issues, particularly around the participation of girls and women in physics, who are under-represented in physics education and employment. In 2003, the Institute introduced a Site Visit scheme, in which selected panels visited physics departments and produced a dedicated report on their “gender inclusiveness”. After two years, the results of these visits were condensed into a general report: Women in University Physics Departments: a Site Visit Scheme. Building upon the best practice identified in this influential report, in 2007 the IOP established Project Juno, an award scheme that aims to promote gender equality in higher education physics departments. The Juno Principles provide a framework for specific actions to improve the participation and retention, particularly of women, in physics careers. The main aims of the scheme are to develop an equitable, open and transparent working culture in which students and staff, men and women, can all achieve their full potential; to promote open discussion of gender and other equality issues; and to encourage departments to determine priorities for action. Departments submit for the award and are assessed by an independent Panel of physicists with longstanding experience of addressing gender equality issues. There are three levels of the scheme (Supporter, Practitioner and Champion) and almost all of the 55 physics departments in the UK and Ireland are now participating, together with Research Institutes and one company. Currently, there are 19 Supporters, 14 Supporters and 17 Champions.
Speaker: Prof. Valerie Gibson (University of Cambridge) -
17:15
Women in Science and Engineering at Syracuse University 15m
The WiSE program at Syracuse University encompasses a broad spectrum of activities designed to develop the unique strengths and overcome the challenges that women in science, technology, engineering, and mathematics (STEM) face at every stage of their education and career, from the beginning of their undergraduate studies to accomplished professional roles.
Key goals of Wise are an improvement of the persistence in STEM of undergraduate women through an emphasis on research, support career development and professional goals for women graduate students and postdoctoral research associates, improve career and personal productivity and balance for women STEM faculty.
The unifying vision of this broad program is the goal of building a strong community and social network for women in STEM.Speaker: Marina Artuso (Syracuse University (US)) -
17:30
XMaS Scientist Experience and Science Gala 15m
The XMaS Scientist Experience was conceived as an impact project aimed at promoting career aspirations for 17-18 year old female school students. It was centred around the XMaS Beamline which is located at the European Synchrotron Radiation facility in Grenoble, France. The competition asks entrants to research a famous female role model and describe her impact to science and 14 successful winners are then taken to visit the facility and the city of Grenoble. It is currently in its third cohort and the programme has since been broadened to include complimentary events including the XMaS Science Gala and other events.
The Science Gala has now ran for two years, the second event taking place on the afternoon of 25th January when the University of Warwick welcomed 600 visitors of all ages to campus. The Gala included a total of 35 exhibition stands highlighting research and projects from across the Physics, Engineering, WMG, Chemistry and Life Science departments as well as outside organisations promoting careers in STEM. We also had tours of different research and teaching labs as well as the ability to view the cosmos in an inflatable planetarium. In addition, there were two talks programmes including an outreach talk for younger audience and a virtual visit to ATLAS at CERN for ages 12 and over. The visitors reported fantastic feedback of the event; of the 46 questionnaires returned 100% would recommend the event and would attend again. 28% saw an increase in scientific interest as result of the science gala (most were already ‘very interested’ and remained ‘very interested’).
We report the long term results from the first cohort of students who participated in the Scientist Experience programme who have now moved on from post 16 education. From the first cohort of 14 students, 9 have gone on to study science based degree at university. We also report on the feedback and evaluation of the Science Gala as well as plans for the future of the XMaS outreach project.Speaker: Mrs Kayleigh Lampard (University of Warwick) -
17:45
TeamScience - a new approach to engaging 8-13 year olds 15m
Science opens new windows on the world, but we must open new windows on science if we are to engage hard-to-reach audiences and improve diversity. Based on the detailed findings of the ASPIRE report from Kings College London, STFC's new Public Engagement Strategy recognises the need to engage young people earlier and more effectively to deliver the message that science is for everyone. ASPIRES and other research has identified factors contributing to low STEM career aspiration in key groups despite a high level of STEM interest. This session will present the interim findings of January-June 2017 pilot projects in mass communication - TeamScience - designed and developed by STFC's Strategic Communications team and run as pilot projects in low science capital regions of the UK. The goal is to demonstrate with local examples and in local accents that "science" has a role in multiple careers. Its key aim will be to break the “not for me” barrier with regard to STEM career aspirations and take our science to traditionally hard to reach audiences. In this session we will announce initial findings, show how the campaign objectives and target audience were developed using readily available research and insight, and discuss some of the ways we are utilising existing channels and opportunities to roll out the campaign.
Speaker: Lucy Stone (STFC) -
18:00
Discussion panel on diversity and inclusion 30m
Given the quite limited number of permanent positions in HEP, is it really possible to be gender/diversity-inclusive? And what about people with a disability?
Speakers: Justine Serrano (CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France), Ms Kristin Kaltenhäuser (IT University Copenhagen), Olaf Steinkamp (Universitaet Zuerich (CH)), Raphael Granier De Cassagnac (Centre National de la Recherche Scientifique (FR))
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QCD and hadronic physics Room Mosaici-1 (Palazzo del Casinò)
Room Mosaici-1
Palazzo del Casinò
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14:30
Top-bottom interference effects in Higgs plus jet production at the LHC 15m
The study of Higgs boson properties form an important part of the LHC program. These studies are not only important for a better understanding of electroweak symmetry breaking mechanism but also for BSM searches. For example, most recently a strategy has been proposed to use LHC measurements of the Higgs transverse momentum distribution to constrain the Yukawa couplings of light-generation quarks to the Higgs boson. In this talk I will present the calculation of NLO QCD corrections of the top-bottom interference contribution to Higgs plus jet production at the LHC. The calculation involved computing two-loop Feynman integrals expanded in a small bottom mass, which we performed with the differential equation method and that I will elaborate upon. I will also show our results for the NLO top-bottom interference contribution to the Higgs transverse momentum distribution
Speaker: Chris Wever (Karlsruhe Institute of Technology) -
14:45
KLOE-2 results on hadron physics 15m
The KLOE experiment has collected 2.5 fb-1 at the e+e- collider DAPHNE. The upgraded detector KLOE-2 has already collected 3.5 fb-1 with a new beam crossing scheme, allowing for a reduced beam size and increased luminosity. Analysis of KLOE data is still in progress, providing new important results in the light meson sector. VPgamma* transitions have been studied using the phi -> eta e+ e-, phi -> pi0 e+ e- decays. For both processes, we obtain the the most precise determination of the BR and of the transition form factor.
KLOE data have been also exploited to obtain a new, precise result on the isospin-violating decay eta-->pi+pi-pi0, aiming to a better determination of the light-quark mass ratio. The analysis determines with very good accuracy the parameters of the decay matrix element. The Dalitz plot density is parametrised as a polynomial expansion up to cubic terms in X and Y. The measurement is sensitive to all charge conjugation conserving terms, providing an improvement of a factor of two on the statistical uncertainty of all parameters with respect to previous experiments. Smaller systematic uncertainties have been also achieved. The un-binned integrated left-right, quadrant and sextant charge asymmetries have also been measured, providing an accurate test of C parity conservation. The values extracted are consistent with zero at 10^-4 level, thus improving existent evaluations.
Precision physics requires appropriate inclusion of higher order effects and the knowledge of very precise input parameters of the electroweak Standard Model. The running of the QED coupling constant alpha in the time-like region in the energy range 0.6-0.975 GeV has been measured for the first time using the KLOE detector. The result shows a clear contribution of the rho-omega resonances to the photon propagator with a significance of the hadronic contribution of more than 5 sigmas. For the first time the real and imaginary part of Delta(alpha(s)) have been extracted.
Speaker: Andrzej Kupsc -
15:00
Newest COMPASS results on longitudinal and transverse nucleon spin structure. 15m
The COMPASS experiment at CERN has performed a rich programme in inclusive and semi-inclusive deep inelastic scattering of longitudinally polarised muons off longitudinally, transversely polarised and unpolarised nucleons. The main topic is the investigation of the spin structure of the nucleon in terms of quark and gluons, both through accessing the spin dependent collinear parton distribution functions and through studying the transverse momentum dependent TMD PDFs. The newest results on the spin structure function of the proton and the deuteron, on the transversity and Sivers PDFs and the measurements of hadron multiplicities will be shown. Plans for the near future will also be presented.
Speaker: Stefano Levorato (Universita e INFN, Trieste (IT)) -
15:15
COMPASS Measurements of Asymmetry Amplitudes in the Drell-Yan Process Observed from Scattering Pions off a Transversely Polarized Proton Target 15m
In 2015 the COMPASS collaboration at CERN studied the Drell-Yan process with a 190 GeV/c π− beam on a transversely polarized ammonia target. From single-spin asymmetries COMPASS was able to determine amplitudes related to the proton Sivers, transversity and pretzelosity transverse momentum dependent (TMD) distributions. The most notable of these TMDs is the Sivers function which has semi-universality and is predicted to change sign between the Drell-Yan and semi-inclusive deep inelastic scattering (SIDIS) processes. COMPASS has previously measured a non-zero Sivers amplitude from SIDIS and therefore COMPASS offers a unique opportunity, with a similar experimental setup and kinematic domain, to definitely conclude on the sign change between the Drell-Yan and SIDIS processes. The data analysis and results of the 2015 Drell-Yan COMPASS data taking will be presented in this talk.
Speaker: Mr Robert Heitz (University of Illinois) -
15:30
Recent highlights from spin structure study of proton in PHENIX experiment at RHIC 15m
The Relativistic Heavy Ion Collider (RHIC) is a versatile machine that has provided collision between a wide range of heavy ions, from d to Au, as well as p-p and p-nucleus collisions, over a range of collision energies. Polarized proton program at RHIC provides unique testing ground for the fundamental study of the proton's spin structure. I will present the latest highlights from the PHENIX experiment addressing the longitudinal and the transverse spin structures of proton and some results from polarized proton and nucleus collisions.
Speaker: Dr Itaru Nakagawa (RIKEN) -
15:45
Measurement of the leading hadronic contribution to the muon g-2 via space-like data 15m
The precision measurement of the anomalous magnetic moment of the muon presently exhibits a 3.5σ discrepancy with the Standard Model (SM) prediction. In the next few years this measurement will reach an even higher precision at Fermilab and
J-PARC. While the QED and electroweak contributions to the muon g-2 can be determined very precisely, the leading hadronic (HLO) correction is affected by a large uncertainty which dominates the error of the SM prediction.
We propose a novel approach to determine the HLO contribution to the muon g-2 based on the measurement of the effective electromagnetic coupling in the
space-like region at low-momentum transfer. We will discuss the possibility of performing this measurement at CERN, by means of a very precise determination of the muon-electron elastic differential cross-section, exploiting the scattering of 150 GeV muons (currently available at CERN's North area) on atomic electrons of a low-Z target. We will describe the experimental challenges posed by this measurement and by a detector able to keep the systematic effects at the required level of 10 ppm.
This measurement will provide an independent determination of the HLO contribution to the muon g-2 competitive with the time-like dispersive approach, thus consolidating the SM prediction. It will therefore allow a firmer interpretation of the measurements of the future muon g-2 experiments at Fermilab and J-PARC.Speakers: Giovanni Abbiendi (Universita e INFN, Bologna (IT)), Giovanni Abbiendi, Giovanni Abbiendi (Universita e INFN (IT)) -
16:00
Coffee break 30m
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Recent PDF developments and PDF needs. 30m
Overview of recent developments in the PDF field (new PDF sets, new directions), focusing on the most urgent challenges in the PDF fits and the PDF needs
from a point of view of an experimental physicists, for both precision observables and new physics searches.Speaker: Alexander Glazov (Deutsches Elektronen-Synchrotron (DE)) -
17:00
Constraints on the Parton Density Functions of the Proton by Measurements with the ATLAS Detector 15m
Parton distribution functions (PDFs) are crucial ingredients for measurements at hadron colliders, since they describe the initial states and therefore critically impact the precision of cross section predictions for observables. This talk will review recent precision analyses, where the PDFs play an important role and discuss the impact of several new ATLAS cross-section measurements on PDFs of the proton. Particular emphasis will be given to the determination of the strange and the gluon content of the proton.
Speaker: Mark Sutton (University of Sussex (GB)) -
17:15
Impact of CMS measurements on Proton Structure and QCD parameters 15m
The sensitivity of CMS measurements to Parton Distribution Functions, strong coupling constant and treatment of heavy flavours in QCD analyses is presented. CMS data collected at various center-of-mass energies and their impact on the PDFs are presented. Measurements of cross sections of jet and top-quark pair production are in particular sensitive to the gluon distribution in the proton and the strong coupling, while the electroweak boson production - inclusive or associated with charm or beauty quarks give insight into the flavour separation of the proton sea and give hints to the treatment of heavy quarks in PDF-related studies.
Speaker: Engin Eren (Deutsches Elektronen-Synchrotron (DE)) -
17:30
Studies of HERA deep inelastic scattering data at low Q^2 and low x_Bj 15m
A phenomenological study of the final combined HERA data on inclusive deep inelastic scattering (DIS) has been performed. The data are presented and investigated for a kinematic range extending from values of the four-momentum transfer, $Q^2$, above 10$^4$ GeV$^2$ down to the lowest values observable at HERA of $Q^2$ = 0.045 GeV$^2$ and Bjorken x, $x_{Bj}$ = 6 x 10−7. The data are well described by fits based on perturbative quantum chromodynamics (QCD) using collinear factorisation and evolution of the parton densities encompassed in the DGLAP formalism from the highest $Q^2$ down to $Q^2$ of a few GeV$^2$. The standard DGLAP evolution was augmented by including an additional higher-twist term in the description of the longitudinal structure function, $F_L$. This additional term, $F_L A_L^{HT}/Q^2$, improves the description of the reduced cross sections significantly. The resulting predictions for $F_L$ suggest that further corrections are required for Q^2 less than about 2 GeV^2. The Regge formalism can describe the data up to $Q^2$ ~ 0.65 GeV$^2$. The complete data set can be described by a new fit using the ALLM parameterisation. The region between the Regge and the perturbative QCD regimes is of particular interest.
Covers 2 papers:
I. Abt et al., Phys. Rev. D 94 (2016) 034032, arXiv:1604.02299
I. Abt et al., arXiv:170403187Speaker: Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE)) -
17:45
The updates of CTEQ-TEA Parton Distribution Functions 25m
We present the updates of CTEQ-TEA parton distribution functions (CT17 PDFs). Previous LHC 7 TeV and HERA 1 data, included in the CT14 PDF analysis, are superseded by HERA 1+2 and new LHC data, especially on W boson, Z boson, inclusive jet, and top quark differential distributions. We also discuss the possibility of a (sizable) non-perturbative contribution to charm parton distribution function in the context of CTEQ-TEA (CT14IC) global analysis at the NNLO.
Speaker: Dr C.-P. Yuan (Michigan State University) -
18:10
The impact of Zpt data on PDF determinations 15m
Recently released ATLAS and CMS measurements of the Z transverse momentum distribution in vector boson hadroproduction have the potential to significantly constrain the gluon and light quark PDFs in a range of Bjorken-x that is relevant for Higgs production.
In this talk I will review the most recent data and discuss their inclusion in a PDF determination based on the NNPDF methodology. In particular, I will discuss their impact on PDF uncertainties and predictions for physical cross-sections relevant to precision Higgs phenomenology.Speaker: Dr Alberto Guffanti (Università degli Studi di Torino & INFN Torino) -
18:25
Measurements of the underlying event activity and double parton scattering processes using the CMS detector 15m
Recent results on the double parton scattering studies and
measurement of the underlying event activity, performed using
proton-proton collisions data collected using the CMS detector
are presented. Comparisons to previous results at different
center of mass energies are also reported. Latest tests of
double parton scattering, underlying event tunes, minimum bias,
and diffraction are made by comparing the CMS Run I and Run II
data with the latest theoretical predictions. Studies used to
derive and test the new CMS underlying event tune, obtained
through the jet kinematic and global event variables in top
quark-antiquark events, are also described.Speaker: Ms Ankita Mehta (Panjab University (IN))
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Top and electroweak Room Volpi (Palazzo del Casinò)
Room Volpi
Palazzo del Casinò
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Top-quark mass determination at LHC: a theory overview 30m
I will discuss the top-quark mass determination at the LHC, according to the
different methods used by the experimental collaborations.
In particular, I will investigate the theoretical uncertainty on the measured mass,
once interpreted in terms of the top-quark pole mass, taking particular
care about non-perturbative corrections due to bottom fragmentation in top decays.Speaker: Gennaro Corcella (INFN - LNF) -
15:00
Direct measurement of the top quark mass in $p\bar p$ collisions at D0 15m
We report the most recent measurements of the mass of the the top quark, performed by the D0 experiment at the Fermilab Tevatron collider using the full Run II (2001--2011) data set corresponding to an integrated luminosity of $9.7\ $fb$^{-1}$. This includes measurements in the dilepton channels using the matrix element and neutrino weighting approaches, as well as measurements in the lepton+jets channel using the matrix element method. We also discuss the final D0 combination and the preliminary D0+CDF combination of the top quark mass using Run I (1992--1996) and Run II measurements.
Speaker: Oleg Brandt (Ruprecht-Karls-Universitaet Heidelberg (DE)) -
15:15
CMS Measurements of the top quark mass and width 15m
Measurements of the top quark mass and width using proton-proton collisions at the LHC at centre-of-mass energies of 7, 8 and 13 TeV are presented. The analyses used different decay channels and production modes of the top quark. Several techniques are investigated based on the reconstruction of the top kinematics from final state products, using leptonic decays with a J/psi, the shapes of top quark decay distributions, or comparing the production rates to the theory expectations, among others. The results are employed to determine the top quark mass and the results furthermore combined and compared to the world average. The dependence of the mass measurement on the kinematic phase space is furthermore investigated, including measuring the difference between the masses of top and antitop quarks.
Speaker: Jose Enrique Palencia Cortezon (Universidad de Oviedo (ES)) -
15:30
Measurements of the top quark mass with the ATLAS detector 15m
The top quark mass is one of the fundamental parameters of the Standard Model. The latest ATLAS measurements of the top quark mass in top quark pair and single top final states are presented. A measurement using lepton+jets top-quark pair events is presented, where a multi-dimensional template fit is used to constrain the uncertainties on the energy measurements of jets. The measurement is combined with a measurement using dilepton events. A measurement in the all-hadronic channel is also reported. In addition an extraction of the top quark mass using leptonic kinematic variables compared with QCD calculations is discussed. Measurements that use precision theoretical QCD calculations for both inclusive ttbar production and ttbar production with an additional jet are also presented to extract the top quark mass in the pole-mass scheme.
Speaker: Richard Nisius (Max-Planck-Institut fur Physik (DE)) -
15:45
Measurement of the pole mass of the top quark using $p\bar p \to t\bar t$ production cross sections at D0 15m
We present an alternative approach to the direct measurements of the top quark mass using D0 data. We discuss extractions of the pole mass of the top quark based on measurements of the inclusive and unfolded differential $p\bar p \to t\bar t$ production cross section as a function of $p_T(t)$ and $t\bar t$ mass.. We use the full Run II data set of $p \bar p$ collisions collected by the D0 experiment, corresponding to an integrated luminosity of $9.7\ $fb$^{-1}$.
Speaker: Frederic Deliot (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)) -
16:00
Coffee break 30m
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Review on Top quark anomalous coupling studies 30m
I review the status of the top quark couplings studies. The discussion is focused on anomalous electroweak interactions, which are largely unconstrained by hadron collider experiments. Possible anomalous interactions in Quantum Chromodynamics are reviewed, as well. In addition to hadron collider experiments, I discuss constraints from B-physics experiments and future colliders.
Speaker: Markus Schulze (Humboldt-University Berlin) -
17:00
Measurements of the top quark properties at decay with CMS 15m
Several measurements of top quark properties are presented using data collected by the CMS experiment at different centre-of-mass-energies. The properties are mostly probed in the decay of the top quarks. The Wtb couplings are probed by measuring the helicity fractions in single top and ttbar topologies or by inspecting a V-A vertex structure of the coupling. Furthermore, searches for flavor-changing neutral currents involving top quarks are discussed including tZq, tɣq, tgq and tHq couplings. Limits are set on anomalous top couplings and the results are furthermore re-interpreted as searches for new physics inducing deviations from the standard model predictions.
Speaker: Andrea Castro (Universita e INFN, Bologna (IT)) -
17:15
Measurements of the top quark properties at production with CMS 15m
Several measurements of top quark properties are presented using data collected by the CMS experiment at different centre-of-mass-energies. The properties are mostly probed in production of the top quarks. The charge asymmetry is measured inclusively and differentially probing anomalous couplings to the gluons at production mode. These measurements are extended searching for asymmetries in CP-odd operators in production and decay. The measurement of the spin density matrix in different final states (lepton+jets and dileptons) is discussed as well as the measurement of the top quark polarization in single top and ttbar events. The results are compared to the state-of-the-art predictions, when available, and re-interpreted as searches for new physics inducing deviations from the standard model predictions.
Speaker: Mykola Savitskyi (Deutsches Elektronen-Synchrotron (DE)) -
17:30
Top quark properties measurements with the ATLAS detector 15m
Precise measurements of the properties of the top quark test the Standard Model (SM) and can be used to constrain new physics models. As it may be significantly enhanced by the presence of new physics, the ttbar production charge asymmetry is measured inclusively and differentially using the 8 TeV ATLAS dataset using both the lepton+jets and dilepton channels, including a dedicated measurement for highly boosted top-quarks. In the SM the top-quark is predicted to decay almost exclusively into a W boson and a b-quark. Measurements of the W-helicity and spin correlations in ttbar production are presented as well as new measurements of CP asymmetries in b-hadron decays using top-quark events.
Speaker: Francesco Spano (Royal Holloway, University of London (GB)) -
17:45
Forward-backward asymmetry in $p\bar p \to t\bar t$ events at the Tevatron 15m
We discuss the complete overview of the forward-backward asymmetry measurements in the angular distributions of $p\bar p \to t\bar t$ events at the Tevatron collider. These measurements use the full Run II data set in lepton plus jets and dilepton channels, recorded in the D0 and CDF detectors, corresponding to an integrated luminosity of $\approx 2\times10\ $fb$^{-1}$ . The combinations of inclusive and differential asymmetries are presented and compared with the NNLO QCD predictions.
Speakers: Jose Enrique Palencia Cortezon (Universidad de Oviedo (ES)), D0 Collaboration (Fermilab), CDF Collaboration (Fermilab) -
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Anomalous couplings in single top and searches for rare top quark couplings with the ATLAS detector 15m
The top quark is the heaviest known fundamental particle and probing its couplings with the other fundamental particle may open a window to physics beyond the Standard Model. Single top-quark production provides a unique window to study the coupling between the top quark, the W boson and the b quark, since it involves the Wtb vertex in both production and decay. Measurements of angular correlations in single top quark events in the t-channel exchange of a W boson are presented based on the 8 TeV ATLAS dataset. Differential cross-sections are measured as a function of angular variables that are sensitive to anomalous contributions to the Wtb vertex and the top quark polarization. Searches for flavour-changing neutral current top-quark interactions are also discussed based on the 8 TeV and 13 TeV ATLAS dataset. Searches for rare top quark decays to Higgs and Z bosons are presented in top quark production, and searches for rare top quark interactions with gluons and Z bosons are presented in single top quark production.
Speaker: Susana Cabrera Urban (Univ. of Valencia and CSIC (ES))
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Higgs and new physics: Long-lived particles Sala Perla (Palazzo del Casinò)
Sala Perla
Palazzo del Casinò
Convener: Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))-
16:30
New long-lived particles at the LHC 30m
In this talk I will give the theory overview for new long-lived particles at the LHC. I will describe some of the motivations including neutral naturalness and dark matter. I will also discuss some particularly spectacular signatures where current searches have limited sensitivity and where a joint experimental and theoretical effort to design new search strategies could result in discovery.
Speaker: Daniel Stolarski (Carleton University (CA)) -
17:00
The MoEDAL Experiment at the LHC - a New Light on the High Energy Frontier 15m
MoEDAL is a pioneering experiment designed to search for highly ionising messengers of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles, that are predicted to existing a plethora of models beyond the Standard Model. It started data taking at the LHC at a centre-of-mass energy of 13 TeV, in 2015. Its ground breaking physics program defines a number of scenarios that yield potentially revolutionary insights into such foundational questions as: are there extra dimensions or new symmetries; what is the mechanism for the generation of mass; does magnetic charge exist; and what is the nature of dark matter. MoEDAL purpose is to meet such far-reaching challenges at the frontier of the field. We will present the first results from the MoEDAL detector on Magnetic Monopole production that are the world’s best for Monopoles with multiple magnetic charge. In conclusion, plans to install a new MoEDAL sub-detector designed to search for very long-lived neutral particles as well as mini-charged particles will be very briefly discussed.
Speaker: James Pinfold (University of Alberta (CA)) -
17:15
Search for long-lived particles at LHCb 15m
A flexible trigger system, excellent vertex locator, particle identification detectors, and forward acceptance allow unique exotica measurements to be performed at LHC energies using data collected with the LHCb detector. A summary of results will be presented, including searches for long-lived particles decaying into jet pairs or semi-leptonically.
Speaker: Alberto Lusiani (Scuola Normale Superiore and INFN Pisa) -
17:30
Searches for long-lived particles and other non-conventional signatures 15m
Many extensions of the standard model including SUSY predict new particles with long lifetimes, such that the position of their decay is measurably displaced from their production vertex, and particles giving rise to other non-conventional signatures. We present recent results of searches for long-lived particles and other non-conventional signatures obtained using data recorded by the CMS experiment at Run-II of the LHC.
Speaker: Todd Adams (Florida State University (US)) -
17:45
Search for New Physics through the Reconstruction of Challenging and Long-Lived Signatures with the ATLAS detector √s = 13 TeV 15m
Many theories of beyond the Standard Model (BSM) physics predict unique signatures which are difficult to reconstruct and the background rates are also a challenge. Signatures from displaced vertices anywhere from the inner detector to the muon spectrometer as well as those of new particles with fractional or multiple value of the charge of the electron or high mass stable charged particles are experimentally demanding signatures. The results of searches using data collected by the ATLAS detector of √s = 13 TeV pp collision is presented.
Speaker: Nora Emilia Pettersson (University of Massachusetts (US)) -
18:00
Search for hidden-sector particles at NA62 15m
Fixed target experiments are a particularly useful tool in the search of very weakly coupled particles in the MeV-GeV range, which are of interest, e.g. as potential Dark Matter mediators. The NA62 experiment at the CERN SPS is currently taking data to measure the rare decay $K \to \pi \nu \bar{\nu}$. Owing to the high beam-energy and a hermetic detector coverage, NA62 also has the opportunity to directly search for a plethora of hidden-sector particles (visible or invisible searches). We will detail on status and prospects of these searches.
Speaker: Gaia Lanfranchi (INFN e Laboratori Nazionali di Frascati (IT)) -
18:15
Search for new physics with the SHiP experiment at CERN 15m
SHiP is a new general purpose fixed target facility, whose Technical Proposal has been recently reviewed by the CERN SPS Committee and by the CERN Research Board. The two boards recommended that the experiment proceeds further to a Comprehensive Design phase in the context of the new CERN Working group "Physics Beyond Colliders", aiming at presenting a CERN strategy for the European Strategy meeting of 2019. In its initial phase, the 400GeV proton beam extracted from the SPS will be dumped on a heavy target with the aim of integrating 2×10^20 pot in 5 years. A dedicated detector, based on a long vacuum tank followed by a spectrometer and particle identification detectors, will allow probing a variety of models with light long-lived exotic particles and masses below O(10) GeV /c2. The main focus will be the physics of the so-called Hidden Portals, i.e. search for Dark Photons, Light scalars and pseudo-scalars, and Heavy Neutrinos. The sensitivity to Heavy Neutrinos will allow for the first time to probe, in the mass range between the kaon and the charm meson mass, a coupling range for which Baryogenesis and active neutrino masses could also be explained. Another dedicated emulsion-based detector will allow detection of light dark matter from dark photon decay in an unexplored parameter range
Speaker: Oliver Lantwin (Imperial College (GB))
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Accelerators for HEP Room Martinelli (Palazzo del Casinò)
Room Martinelli
Palazzo del Casinò
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09:00
Accelerator designs and R&D for the Electron-Ion Collider 25m Room Martinelli
Room Martinelli
Palazzo del Casinò
An Electron Ion-Collider (EIC) has been highlighted as the highest priority for new construction in the DoE Office of Nuclear Physics. This is a very challenging accelerator that aims at achieving high luminosity and polarization collisions of electrons with multiple ions species and variable center of mass.
Alternative designs are pursued at Jefferson Laboratory (JLEIC) and Brookhaven National Laboratory (eRHIC) each capitalizing on the existing CEBAF and RHIC facilities respectively. I will overview the design options at JLAB and BNL, the accelerator R&D necessary to validate the designs and will explore areas of potential synergy and collaboration.Speaker: Fulvia Pilat (Jefferson Laboratory) -
09:25
Status and Prospects of e+e- Factories 25m Room Martinelli
Room Martinelli
Palazzo del Casinò
A review of the state of the art of presently working e+e- colliders, from low to high energy, will be presented, with a brief summary of performances. A review of proposed e+e- colliders will also be presented with highlights on the technical challenges.
Speaker: Dr Maria Enrica Biagini (INFN-LNF) -
09:50
Machine Detector Interface for the e+e- Future Circular Collider 25m Room Martinelli
Room Martinelli
Palazzo del Casinò
The design of the interaction region (IR) of the positron-electron future circular collider must comply with various important constraints, imposed by high beam currents, short bunches, high beam energy, high luminosity need for polarization, and crossing scheme. The innovative IR layout of the FCC-ee is based on the crab-waist collision scheme and it will be compatible for all beam energies foreseen, from 175 to 45.6 GeV. It will be shown how the latest layout for the interaction region fulfills all requirements and physical constraints, as confirmed by numerical simulations performed on critical topics such as synchrotron radiation, trapped modes, collective effects, etc. The present magnet layout including solenoid compensation scheme will be discussed, together with the design of the luminosity calorimeter and the designs for the first IR quadrupole design. A refined Geant4 model for the MDI will be described, which allows studying the impact of luminosity and beam backgrounds on the detector occupancy.
Speaker: Manuela Boscolo (Istituto Nazionale Fisica Nucleare Frascati (IT)) -
10:15
Lessons from CTF3 25m Room Martinelli
Room Martinelli
Palazzo del Casinò
The CLIC Test Facility (CTF3) was built to demonstrate the feasibility of the CLIC two beam acceleration scheme. The main issues to be verified were the high current drive beam generation using a fully loaded highly efficient linac and a beam combination scheme, based on transverse RF deflectors, to increase beam current and bunch repetition frequency.
The drive beam has been used for GW level RF power production and two beam acceleration experiments. CTF3 was also a test ground for development of many accelerator technologies.
Its operation was concluded in 2016 and in this contribution the results relevant for the CLIC design as well as for the whole accelerator physics community will be presented.Speaker: Piotr Krzysztof Skowronski (CERN) -
10:40
Towards 16 T dipole magnets for Future Circular Colliders 25m Room Martinelli
Room Martinelli
Palazzo del Casinò
The construction of new particle accelerators, more powerful and larger than ever, requires the design and development of high-field superconducting magnets made of Nb3Sn conductor. Beyond obvious challenges pertaining to the size of such machines and consequently, the financial endeavour, the production of superconducting magnets of accelerator quality, which develop fields much higher than nowadays, calls for a number of design innovations and technological pushes. The Nb3Sn magnets for the High Luminosity LHC, namely the 11T dipole magnet for the upgrade of the LHC collimation system, and the large aperture quadrupole for the new triplets, are a big step forward. The installation in LHC of four 11T dipole magnets is foreseen during the long shut down 2 of the machine that is scheduled in years 2019-2020. It will be the first Nb3Sn magnet ever installed in a particle accelerator. This paper presents the progress at CERN on the development activities relating to the 11 T dipole magnet, with an overview of the technological challenges. The FRESCA II magnet, a 13 T dipole with a 100 mm aperture that will be used to upgrade the CERN cable test facility FRESCA, will be briefly presented, as another step towards higher fields. Finally, an overview of the 16 T dipole magnet programme currently conducted jointly in Europe and in the US will be given, with focus on the design and technology developments.
Speaker: Frederic Savary (CERN) -
11:05
Coffee break 30m
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First Physics Results of AWAKE, a Plasma Wakefield Acceleration Experiment at CERN 25m Room Martinelli
Room Martinelli
Palazzo del Casinò
AWAKE is a plasma wakefield acceleration experiment using the 12cm-long, 400GeV proton bunch of the CERN SPS. In order to reach an acceleration gradient in the GeV/m range, the plasma electron density is $7\times10^{14}cm^{-3}$. The transverse self-modulation instability (SMI), strongly seeded by an laser ionization front, turns the long bunch into a train of micro-bunches at the plasma wavelength scale ($\sim$1mm) that resonantly drives the wakefields to large amplitude. Low energy electrons ($\sim$15MeV) can then be externally injected and accelerated to GeV energies.
The plasma source is a laser-ionized rubidium vapor source. The vapor density is measured with $<0.5\%$ accuracy at both ends of the source.
The detection of the SMI is based on diagnostics aimed at measuring the proton bunch modulation: fluorescent screens for detection of the defocused protons at two locations, optical transition radiation (OTR) and streak camera for direct observation of the modulation, and coherent transition radiation (CTR) for modulation frequency measurements.
The first experiments focus of the study of the SMI. Experimental results obtained in late 2016 show signs of self-modulation on all diagnostics. Further SMI experiments will be conducted in 2017, together with the installation of the RF-gun and of the electron spectrometer. Injection and acceleration experiments will be conducted in 2018.
After a general introduction to AWAKE and to its physics, the experimental apparatus will be briefly described and the most recent experimental results will be presented. Mid- and long-term plans, including future experiments, the development of scalable plasma sources and possible applications to HEP will be discussed.
Speaker: Patric Muggli (Max Planck Institute for Physics) -
12:00
Results from Mice Step IV 25m Room Martinelli
Room Martinelli
Palazzo del Casinò
Muon beams of low emittance provide the basis for the intense, well characterised neutrino beams of the Neutrino Factory and for leptonantilepton
collisions at energies of up to several TeV at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization
cooling the technique by which it is proposed to reduce the phasespace
volume occupied by the muon beam. MICE is being constructed in a series of Steps.
The configuration currently in operation at the Rutherford Appleton Laboratory is optimised for the study the properties of liquid hydrogen and lithium
hydride that affect cooling. The data taken in the present configuration have been partially analyzed and the available results will be described in detail.Speakers: François Drielsma (Universite de Geneve (CH)), Vittorio Palladino (Universita e INFN, Napoli (IT)) -
12:25
Gamma Factory proposal 25m Room Martinelli
Room Martinelli
Palazzo del Casinò
Atomic physics, dismissed prematurely by many to the role of introductory chemistry, had a remarkable renaissance in recent decades thanks to the new ideas and progress in laser technologies. Could this path be followed in other research domains which address femtometer length scales? The key challenge is to create high intensity and brilliance photon beams in the gamma-ray, MeV region, which is inaccessible for the FEL based technologies. The aim of the Gamma Factory project, presented in this talk, is to extend the intensity frontier of the presently operating gamma beam sources by, at least, 6-7 orders of magnitude, for tuneable-energy, quasi-monochromatic gamma-rays, within the photon energy range of 100KeV - 400 MeV. The underlying idea is to use the CERNs high energy beams of partially stripped atoms as "converters" of the laser photons into the MeV gamma rays. High intensity gamma-ray beams could be used in a very broad spectrum of research domains such as: fundamental QED measurements, dark matter searches, investigation of basic symmetries of the Universe, studies of the QCD-confinement phenomena and studies of nuclear structure. They could generate high intensity, polarised electron, positron and muon beams for the future high energy physics projects, such as the TeV-range lepton collider and neutrino factory. They could also be used to produce intense neutron and radioactive beams for the nuclear physics applications.
Speakers: Mieczyslaw Krasny (LPNHE, Uviversity Paris), Mieczyslaw Krasny (Centre National de la Recherche Scientifique (FR)), Mieczyslaw Krasny (Centre National de la Recherche Scientifique (FR)) -
12:50
Studies of a scheme for low emittance muon beam production from positrons on target 10m Room Martinelli
Room Martinelli
Palazzo del Casinò
A new scheme to produce muon beams characterized by very low emittance, in such a way to avoid the need for cooling, using a positron beam of about 45 GeV interacting on electrons on target is being studied by our group. This scheme is challenging and innovative, and needs a full design study to be developed. In particular, one of the novel topics to be investigated is the interaction between the positron beam stored in a low emittance ring with a thin target, to be inserted directly in the ring chamber to produce muons.
Produced muons will then be immediately collected at the exit of the target and transported to two + and - accumulator rings. In this work, we discuss the simulation of the e+ beam interacting with the target, its degradation in the 6-D phase space and the optimization of the e+ ring design mainly to maximize the energy acceptance. To this aim, two different approaches has been followed using different codes, in order to compare their results regarding the performances of this scheme.Speaker: Francesco Collamati
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Astroparticle physics Room Casinò (Palazzo del Casinò)
Room Casinò
Palazzo del Casinò
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Precision Measurement of the positron fraction in Primary Cosmic Rays with AMS on the Space Station 15m
Measurements of the individual electron and positron fluxes and of the positron fraction have different systematic errors. The flux measurements depend on the acceptance while the fraction measurement depends more on statistics. The latest AMS results on the precision measurement of the positron fraction in primary cosmic rays in the energy range from 0.5 to 700 GeV based on ~20 million positron and electron events are presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show that at ∼260 GeV the positron fraction reaches its maximum. Comparison of the measured positron fraction with the Dark Matter and other models will be presented.
Speaker: Valerio Vagelli (Universita e INFN, Perugia (IT)) -
09:15
AugerPrime: the upgrade program of the Pierre Auger Observatory. 15m
The highest-energy cosmic rays measured with the Pierre Auger Observatory over the past decade provide us with unprecedented glimpses into their origin and properties. Improvements to this understanding will come from a major upgrade stage of the Observatory denominated AugerPrime. The upgrade program will include new plastic scintillator detectors on top of all water-Cherenkov detectors, a faster and more powerful electronics, and the extension of the dynamic range.
Complementing the water-Cherenkov detectors of the surface array with scintillator detectors, we will be able to evaluate the muonic component of the showers and thus to estimate the primary mass of the ultra high energy cosmic rays on an event by event basis, reaching the region of the flux suppression. The enhanced information on composition will allow us to perform anisotropy studies on selections of mass groups and to explore the hadronic interactions in an unexplored energy and kinematic region.
After introducing the physics motivation for upgrading the Auger Observatory, the planned detector upgrade and the technical realization will be presented, with an emphasis on the expected performance and the improved physics sensitivity.Speaker: Gabriella Cataldi -
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The EUSO-SPB mission 15m
EUSO-SPB (Extreme Universe Space Observatory - Super Pressure Balloon) is an experiment on board a super pressure balloon for a flight duration which may reach 100 days. The instrument was launched on the 25th April 2017 from Wanaka in New Zealand and it is now acquiring data.
The instrument is an updated version of the EUSO-Balloon one. It includes a full original JEM-EUSO PDM (Photon Detection Module with 2304 pixels), and an optical system with two Fresnel lenses with a side of 1 meter covering a field of view of ±6 degrees.
The main scientific objective is the first observation and measurements of Ultra High Energy Cosmic Ray Air Showers by looking down from near space with a fluorescence detector. The EUSO-SPB will also search for UV pulse like signatures from other objects as meteoroids, atmosphere TLEs, SQM, LSPs and it will measure slowly varying UV light as airglow, bioluminescence events over the ocean.Speaker: Valentina Scotti -
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The SST-1M Cherenkov telescope for high-energy gamma-ray astronomy and its SiPM-based camera 15m
An array of about 70 small-sized telescope will cover the high-end of the gamma ray energy spectrum at the southern site
of the Cherenkov telescope array (CTA). They will offer an unprecedented insight on the energetic processes in the range
1-300TeV originated in galactic and extragalactic sources.
The SST-1M is one of the three implementations of those small-sized telescopes and consists of an innovative digital
camera based on silicon photo-multipliers mounted on a Davis-Cotton optics with a single segmented 4-m diameter mirror.The telescope, the photo-detection plane, its digital readout and its trigger system will be described, together with
the test setup realised to fully characterise the camera and the calibration strategy to operate it. This test setup
allows us to asses the performances of the camera, from the single silicon photo-multiplier response to the overall
trigger rate and efficiencies. The performances of the system will be discussed and compared to end-to-end simulations
of the telescope.Speaker: Victor Coco (Universite de Geneve (CH)) -
10:00
Status of the KM3NeT/ARCA telescope 15m
The KM3NeT Collaboration is constructing a research infrastructure hosting the next-generation underwater neutrino observatory. It will be distributed in two sites in the Mediterranean Sea with different configurations: ORCA (Mton scale 2500 depth offshore Toulon (France)) and ARCA (Gton scale, 3500 m offshore Capo Passero (Italy). The KM3NeT/ARCA is the high-energy component and is dedicated for the search of extraterrestrial neutrino sources in the TeV-PeV range. ARCA, with 1 km3 of instrumented volume, will offer independent confirmation of the IceCube flux within about one year of data taking. Furthermore, it will profit of the advantage of this location (better visibility of the Galactic Centre and Galactic Plane compared to the South Pole) and better angular resolution. Optimized to study point-like neutrino fluxes, KM3NeT/ARCA will therefore open the path to identifying their sources. The ARCA telescope is currently under construction about 100 km off-shore Portopalo di Capo Passero (Sicily), at a depth of 3500 m. The first lines have been deployed and the analysis ongoing to validate the detector performance. We will present the status of KM3NeT/ARCA and the future prospects of the project.
Speaker: Carla Distefano -
10:15
Results from the 35-ton Liquid-argon Prototype using Cosmic Rays and Lessons Learned 15m
Liquid argon time projection chambers (LArTPCs) provide a robust and elegant method for measuring the properties of neutrino interactions above a few tens of MeV by providing 3D event imaging with excellent spatial resolution. LArTPCs have been chosen by the Deep Underground Neutrino Experiment (DUNE) as the far detector technology and it will play an essential role in the studies of neutrino mass ordering and CP violation as well as searches for proton decays and supernova neutrinos. The 35 ton prototype, located at Fermilab, featured many advanced technologies being considered by the DUNE far detector, such as the membrane cryostat, cold electronics, anode plane assembly (APA) with wrapped wires, silicon photomultipliers to readout scintillation photons, scintillator counters to trigger cosmic ray muons. The high quality data in the 35-ton LArTPC are important to the understanding of many physics effects such as the attenuation caused by impurities, diffusion, space charge, and calorimetric response of muons, protons and neutral pions.
Speaker: Michael Wallbank -
10:30
Unmasking the ultrahigh-energy cosmic ray origin 15m
The sharp change in slope of the ultrahigh-energy cosmic ray (UHECR) spectrum around 10^9.6 GeV (the ankle), combined with evidence of a light but extragalactic component near and below the ankle which evolves to intermediate composition above, has proved exceedingly challenging to understand theoretically. Recently, we introduced a very general model, in which for a range of source conditions, photo-disintegration of ultrahigh-energy nuclei in the region surrounding the UHECR accelerator naturally accounts for the observed spectrum and composition of the entire extragalactic component, which dominates above about 10^8.5 GeV. In this talk I will review the generalities of the model and show that starburst galaxies provide a compelling source example.
Speaker: Prof. Luis Anchordoqui (Lehman College, City University of New York) -
10:45
Astroparticle Physics in Hyper-Kamiokande 15m
The Hyper-Kamiokande (Hyper-K) experiment centres around two proposed next-generation underground water Cherenkov detectors that will be nearly 20 times larger than the highly successful Super-Kamiokande and use significantly improved photodetectors with the same 40 % photocoverage. The resulting sensitivity improvements will particularly benefit astroparticle physics at low energies.
This talk will give an overview over Hyper-K and present its projected physics reach in the areas of supernova neutrinos, solar neutrinos and indirect dark matter searches, based on the current design report. It will also discuss additional sensitivity improvements if the second detector is built in Korea in a location with a higher overburden.Speaker: Jost Migenda (University of Sheffield)
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Detectors and data handling Room Amici (Palazzo del Casinò)
Room Amici
Palazzo del Casinò
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The Mu2e tracker and calorimeter systems 15m
The Mu2e experiment at Fermilab will measure the charged-lepton flavor violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. This process results in a mono-energetic electron with an energy slightly below the muon rest mass (104.967 MeV). Mu2e will improve the previous measurement by four orders of magnitude using a new technique, reaching a SES (single event sensitivity) of 2.5 x $10^{-17}$ on the conversion rate. The experiment will reach mass scales of nearly $10^4$ TeV, far beyond the direct reach of colliders. The experiment is sensitivity to a wide range of new physics, complementing and extending other CLFV searches.
A very intense pulsed muon beam ($\sim 10^{10} \mu/$ sec) is stopped on a target inside a very long solenoid where the detector is located. The Mu2e detector is composed of a tracker and an electromagnetic calorimeter and an external veto for cosmic rays surrounding the solenoid. The Mu2e tracker is the primary divide to measure the momentum of the electron and separate it from background. The crystal calorimeter plays an important role in providing particle identification capabilities, a fast online trigger filter while aiding the track reconstruction capabilities.
This presentation will cover the details of the tracker and of the calorimeter providing a summary of
the experimental status for the two detectors.Speaker: Simona Giovannella (INFN) -
09:15
The CMS Tracker upgrade for HL-LHC 15m
The LHC machine is planning an upgrade program which will smoothly bring the luminosity at about 5*10^34cm-2s-1 in 2028, to possibly reach an integrated luminosity of 3000fb-1 by the end of 2037. This High Luminosity LHC scenario, HL-LHC, will require a preparation program of the LHC detectors known as Phase-2 upgrade. The current CMS Outer Tracker, already running beyond design specifications, and CMS Phase1 Pixel Detector will not be able to survive HL-LHC radiation conditions and CMS will need completely new devices, in order to fully exploit the high-demanding operating conditions and the delivered luminosity. The new Outer Tracker should have also trigger capabilities. To achieve such goals, R&D activities are ongoing to explore options either for the Outer Tracker, either for the pixel Inner Tracker. Solutions are being developed that would allow including tracking information at Level-1. The design choices for the Tracker upgrades are discussed along with some highlights of the R&D activities.
Speaker: Sudha Ahuja (UNESP - Universidade Estadual Paulista (BR)) -
09:30
Overview and developments for the Phase-II upgrade of the inner tracker of the ATLAS experiment 15m
In the high luminosity era of the Large Hadron Collider (HL-LHC), the instantaneous luminosity is expected to reach unprecedented values, resulting in about 200 proton-proton interactions in a typical bunch crossing. To cope with the resultant increase in occupancy, bandwidth and radiation damage, the ATLAS Inner Detector will be replaced by an all-silicon system, the Inner Tracker (ITk), aiming to provide tracking coverage up to |$\eta$|<4.
The ITk consists of an inner pixel and an outer strip detector. The total surface area of silicon in the new pixel system could measure up to 14 m2, depending on the final layout choice, due in 2017. The strip detector will compromise up to 190 m2 of silicon. In the collaboration a large effort is ongoing to evaluate the design both with simulation and experimental results. In the presentation highlight results of various components like sensors, modules and larger structures for both the pixel and strip detector will be shown.
Speaker: Helen Hayward (University of Liverpool (GB)) -
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The ALICE ITS upgrade 15m
The ALICE experiment at CERN is built to study the properties of the strongly interacting matter created in heavy-ion collisions at the LHC. A major upgrade of its Inner Tracking System (ITS) is currently undergoing, which will increase the data taking capability by more than two orders of magnitude. At the same time, the secondary vertexes reconstruction precision will improve by at least a factor 3.
The enabling technology for such performance boost is the adoption of custom-designed Monolithic Active Pixel Sensors (MAPS) to instrument the 10 square meters ITS sensible surface. Manufactured in the TowerJazz 180 nm CMOS imaging sensor process on wafers with a high resistivity epitaxial layer, the ALice PIxel DEtectors (ALPIDE) embed several design innovations to optimize charge collection efficiency, sustainable hit rate and low power consumption. The connections topology developed to read, control and supply the about 25000 sensors composing the ITS, and the technical solutions adopted to mechanically support them, also contribute to reach the target performance level.
In this talk we will go through the most innovative elements which characterize the ITS design, illustrating the driving physics targets and discussing the adopted solutions, together with the major problems faced to implement them. Expected final system performance and actual sensors characterization figures will provide compelling evidence of the advantages monolithic technology can bring to HEP tracking apparatus.
Speaker: Paolo Camerini (Universita e INFN, Trieste (IT)) -
10:00
A continuous read-out TPC for the ALICE upgrade 15m
The largest gaseous Time Projection Chamber (TPC) in the world, the ALICE TPC, will be upgraded based on Micro Pattern Gas Detector technology during the second long shutdown of the CERN Large Hadron Collider in 2019/20. The upgraded detector will operate continuously without the use of a triggered gating grid. It will thus be able to record all minimum bias Pb-Pb collisions that the LHC will deliver at the anticipated peak interaction rate of 50 kHz for the high luminosity heavy-ion era. New read-out electronics will send a continuous stream of data to a new online farm at a rate of 3 TByte/s.
To keep distortions due to space charge from back-drifting ions at a tolerable level, an ion feedback of below 1 % is required. The new read-out chambers will consist of stacks of 4 GEM foils combining different hole pitches. In addition to a low ion backflow, other key requirements such as energy resolution and operational stability have to be met. A careful optimisation of the performance in terms of all these parameters was achieved during an extensive R&D program. A working point well within the design specifications was identified, with an ion backflow of 0.7 %, a local energy resolution of 12 % (sigma) and a discharge probability for irradiation with alpha particles of the order of 10^-10.
The project has now entered the production phase. The status of the various activities and results from testing GEM foils, first chambers and readout electronics will be presented.
Speaker: Christian Lippmann (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) -
10:15
The Fermilab Muon g-2 straw tracking detectors and the muon EDM measurement. 15m
The Fermilab Muon g-2 experiment will measure the anomalous magnetic moment of the muon to a precision of 140 parts per billion, which is a factor of four improvement over the previous E821 measurement at Brookhaven. The experiment will also extend the search for the muon’s electric dipole moment (EDM) by approximately two orders of magnitude with a sensitivity down to 10$^{-21}$ e.cm. Both of these measurements are made by an analysis of the modulation of the decay rate of the higher-energy positrons from the (anti-)muon decays recorded by 24 calorimeters and 3 straw tracking detectors. The straw tracking detectors will be used to cross-calibrate the calorimeter, identify pileup and muons lost from the storage region, and to measure the beam-profile. A tracker measurement of the up-down modulation of positrons will be used in the EDM analysis.
In this talk, the mechanical design of the straw tracking detector will be described and the first data from the 2017 g-2 commissioning run presented. Each tracking detector module comprises 128 straws supported by two aluminium manifolds which contain the front-end readout and HV boards which are water cooled via a channel machined into the manifold. The straws are tensioned and crimped with bespoke tools. The manifold is housed in a vacuum chamber with an interconnecting flange which in turn is connected to the back-end readout electronics via an aluminium snout. The performance of the tracking detectors in beam-tests, simulation and the first data from the g-2 experiment will be described and the expected performance in the physics data-taking in 2018/19 will be presented, particularly in the context of the experiment’s sensitivity to a muon EDM.
Speaker: Rebecca Chislett -
10:30
The upgrade of the LHCb trigger for Run III 15m
The LHCb detector at the LHC is a general purpose detector in the forward region with a focus on reconstructing decays of c- and b-hadrons. For Run III (2021 onwards) of the LHC, LHCb will take data at an instantaneous luminosity of 2 × 10^{33} cm−2 s−1, five times higher than in Run II (2015-2018). To cope with the harsher data taking conditions, the LHCb collaboration will upgrade the DAQ system and install a purely software based trigger, in addition to various detector upgrades, to process the 30MHz of inelastic collisions delivered by the LHC. A new trigger strategy with real-time reconstruction, alignment and calibration will be employed. We demonstrate how the modified detector infrastructure will be able to face this challenge and discuss the necessary changes to the reconstruction sequence, with particular attention to the performance and execution time budget. We present a novel strategy to distribute and maximise the bandwidth among the different physics channels using a genetic algorithm. This maximises the efficiency for useful physics events.
Speaker: Mark Peter Whitehead (CERN) -
10:45
The HEPD apparatus for the CSES mission 15m
The CSES (China Seismo-Electromagnetic Satellite) mission will investigate the structure and the dynamic of the topside ionosphere, will monitor electric and magnetic field and high energy particle fluctuations, searching for their correlations with the geophysical activity, in order to contribute to the monitoring of earthquakes from space.
The High-Energy Particle Detector (HEPD) is one of the payloads of the CSES space mission, built by the Italian “Limadou” collaboration.
Results of the test beams held at the Beam Test Facility of the INFN National Laboratory of Frascati, for electrons, and at the Proton Cyclotron of Trento, for protons, will be presented. The performance of the apparatus both on the energy reconstruction and in the lepton/hadron separation will be shown.Speaker: Beatrice Panico (INFN - National Institute for Nuclear Physics) -
11:00
Coffee break 30m
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The SiD Detector for the International Linear Collider 15m
The SiD Detector is one of two validated detector designs for the future International Linear Collider. SiD features a compact, cost-constrained design for precision Higgs and other measurements, and sensitivity to a wide range of possible new phenomena. A robust silicon vertex and tracking system, combined with a 5 Tesla central solenoidal field, provides excellent momentum resolution. The highly granular calorimeter system is optimized for Particle Flow application to achieve very good jet energy resolution over a wide range of energies. Details of the proposed implementation of the SiD subsystems, as driven by the physics requirements, will be given. Integration with the accelerator, the push-pull mechanism, and the detector assembly procedures at the Kitakami site will be described, together with the estimated timeline for construction in relation to the overall ILC Project.
Speaker: Tim Barklow (SLAC National Accelerator Laboratory (US)) -
11:45
The CLIC detector 15m
The proposed Compact Linear Collider (CLIC) will provide
electron-positron collisions with centre-of-mass energy operation in
three stages from a few hundred GeV up to 3 TeV. This offers a rich
precision physics program combined with high sensitivity to a wide range
of possible new phenomena. The precision required for such measurements
and the specific conditions imposed by the beam bunch sizes and time
structure put strict requirements on the detector design and technology
development. This includes ultra-low mass vertexing and tracking systems
with small cells, highly granular imaging calorimeters, and a precise
hit-timing resolution for all subsystems. A new optimised detector model
matching these requirements has been integrated in the CLIC simulation
framework. A variety of detector optimisation studies have been carried
out to establish the overall detector performance and to assess the
impact of different technology options. In parallel, ambitious R&D
programs, e.g. for silicon tracking detectors, are pursued, addressing
the challenging detector requirements with innovative new technologies.
This contribution reviews the optimisation studies performed for
critical parameters of the CLIC detector, presents the detector
performance achieved in full-detector simulations and gives an overview
of the ongoing hardware R&D.Speaker: Matthias Artur Weber (CERN) -
12:00
The upgrading of the ICARUS T600 detector 15m
The ICARUS T600 detector is the largest LAr-TPC operated to date. It performed a successful three-year physics run at the underground LNGS laboratories, studying neutrino oscillations with the CNGS neutrino beam from CERN, and searching for atmospheric neutrino interactions in cosmic rays.
After an intense refurbishing operation, the entire apparatus will be transferred to FNAL (USA), were it will become the far detector of the Short Baseline Neutrino (SBN) program to investigate the possible presence of sterile neutrino states. The T600 detector has undertaken a significant overhauling process at CERN. This introduces new technological developments while at the same time maintaining the already achieved performance. The overhauling covers important technical sections: the realization of new vessels and the review of the cryogenic system; the improvement of the cathodes planarity; the upgrade of the light detection system; the renovation of the read-out electronics. In this contribution, the main activities of the refurbishing operation will be described in details, highlighting the major changes that will affect the ICARUS T600 physics run in the United States.Speaker: Gian Luca Raselli (Universita e INFN, Pavia (IT)) -
12:15
The Baby MIND spectrometer for the J-PARC T59(WAGASCI) experiment 15m
The Baby MIND detector under construction at CERN will measure the momentum and charge of muons from neutrino interactions in the WAGASCI neutrino targets. The WAGASCI experiment, referred to as T59 at J-PARC, will measure the ratio of neutrino interaction cross-sections on water and plastic using a three-dimensional grid structure providing large angular acceptance. The Baby MIND consists of 33 steel magnet modules, each approximately 2 tonnes, interleaved with 18 scintillator modules. The novel magnetisation scheme is a significant departure from more classical approaches for magnetised iron neutrino detectors. Due to handling constraints at J-PARC, narrow shaft, each magnet module is individually magnetised. This provides far greater modularity and flexibility in the layout, with greater possibilities to surround other neutrino targets such as water Cherenkov, liquid argon or plastic scintillators.The use of such magnetised iron plates would not usually be considered for muon momenta below 1 GeV/c due to multiple scattering in the steel. By optimising the layout, the Baby MIND can determine the charge of muons with good efficiencies down to 400 MeV/c. Custom readout electronics was developed based on the CITIROC ASIC and has trigger and synchronisation features optimised for operation at J-PARC. This presentation will cover the design and construction of the Baby MIND detector, and measurements of charge identification efficiencies from the latest campaign of beam tests at the CERN PS.
Speaker: Etam Noah Messomo (Geneva University (CH)) -
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The upgrade project of the T2K near detector 15m
The T2K neutrino oscillation experiment established the $\nu_\mu \rightarrow \nu_e$ appearance with only 10\% of the original beam request of $7.8\times10^{21}$ 30 GeV protons on target (p.o.t.). In view of the J-PARC program of upgrades of the beam intensity, the T2K-II proposal requires to run up to $20\times10^{21}$ p.o.t., i.e. an increase of the exposure by more than a factor 10 aimed at establishing CP violation at 3 $\sigma$ level for a significant fraction of the possible $\delta_{CP}$ values. The Hyper-K proposal consists in a further increase by a factor 10 of the far detector mass. Facing the potential increase of statistics by two orders of magnitude, it is of great importance to undertake a vigorous program of near detector upgrades, with the aim of reducing the overall statistical and systematic uncertainties at the appropriate level of better than 4\%.
Time Projection Chambers equipped with MPGD have been used with success for the T2K ND280 near detector and are proposed for the upgrade of the T2K near detector together with fine-grained scintillator-based targets and TOF detectors. The requirements of TPCs for neutrino detectors are quite specific. We envisage to use a very thin field cage, resistive Micromegas detectors for the charge readout and state-of-the-art electronics.
A project (CERN-SPSC-2017-002 and SPSC-EOI-015) combining the upgrade of the T2K near detector and the R&D for a High Pressure TPC has been recently launched. A High Pressure TPC would be a very sensitive detector for the detailed study of neutrino-nucleus interactions, a limiting factor for extracting the ultimate precision in long baseline experiments. High pressure TPCs are also being considered for future long-baseline experiments like Hyper-Kamiokande and DUNE.
We will report on the goals of this project and its development program including prototypes, beam tests, and projected performances.
Speaker: Davide Sgalaberna (Universite de Geneve (CH)) -
12:45
Upgrades and studies of aging of the CMS muon system in preparation of HL-LHC 15m
The present CMS muon system operates three different detector types: in the barrel drift tubes (DT) and resistive plate chambers (RPC), along with cathode strip chambers (CSC) and another set of RPCs in the forward regions. In order to cope with increasingly challenging conditions various upgrades are planned to the trigger and muon systems.
In view of the operating conditions at HL-LHC, it is vital to asses the detector performance for high luminosity. New irradiation tests had to be performed to ensure that the muon detectors will survive the harsher conditions and operate reliably. The new CERN GIF++ (Gamma Irradiation Facility) allowed to perform aging tests of these large muon detectors. We present results in terms of system performance under large backgrounds and after accumulating charge through an accelerated test to simulate the expected dose.
New detectors will be added to improve the performance in the critical forward region: large-area triple-foil gas electron multiplier (GEM) detectors will already be installed in LS2 in the pseudo-rapidity region 1.6 < eta < 2.15, aiming at suppressing the rate of background triggers while maintaining high trigger efficiency for low transverse momentum muons. For the HL-LHC operation the muon forward region should be enhanced with another large area GEM based station, called GE2/1, and with two new generation RPC stations, called RE3/1 and RE4/1, having low resistivity electrodes. These detectors will combine tracking and triggering capabilities and can stand particle rates up to few kHz/cm2. In addition to take advantage of the pixel tracking coverage extension a new detector, ME0 station, behind the new forward calorimeter, covering up to |η| = 2.8.
Speaker: Andrey Korytov (University of Florida (US))
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Flavour and symmetries Room Mosaici-2 (Palazzo del Casinò)
Room Mosaici-2
Palazzo del Casinò
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Getting to grips with hadronic uncertainties in kaon physics and in (g-2)_mu 30m
Being able to predict a small set of hadronic observables precisely and more importantly reliably
in lattice QCD has been a big achievement (see Flavour Lattice Averaging Group review). Decreasing the precision
below the %-level and increasing the set of numbers for which predictions can be made is challenging
but exciting. This talk will highlight recent conceptual progress on hadronic contributions to the muon g-2 and on
long distance effects for kaons (mixing and rare decays).Speakers: Andreas Juettner, Andreas Juttner (University of Southampton (GB)) -
09:30
Recent results from kaon physics 30m
K->pinunu is one of the theoretically cleanest meson decay where to look for indirect effects of new physics complementary to LHC searches. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the K+->pi+nunu decay with 10% precision. NA62 took data in 2015 and 2016 reaching the Standard Model sensitivity. The KOTO experiment in Japan is investigating the decay K0->pi0 nunu reaching a higher background suppression.Both experiments will be reviewed, and recent results and prospects will be presented.
Speaker: Giuseppe Ruggiero (University of Liverpool (GB)) -
10:00
Experimental Summary:Performance and systematics from the g-2 experiment at FNAL 30m
We present the most recent data from the engineering run at FNAL of the new g-2 experiment. The method of extracting the anomalous magnetic moment is summarized and the improvements implemented in the new experimental beam delivery, storage ring, detectors and analysis techniques are discussed. The current understanding of the systematics from the experiment and theory are presented together and the expected sensitivity to BSM physics is discussed.
Speaker: Prof. Mark Lancaster (University College London (UK)) -
10:30
Update on the hadronic vacuum polarisation contributions to muon g-2 and alpha(m_Z^2) 15m
Using new hadronic cross section data for more than 10 exclusive channels mainly from Babar in the energy range up to 2 GeV and also from VEPP-2000, the hadronic contributions to the muon magnetic anomaly and to the running of the electromagnetic coupling constant at the Z-boson mass are updated. The new data complement the previously available information on exclusive channels allowing to alleviate the need for estimation of missing channels based on isospin symmetry. The updated muon g-2 is 20% more precise than our previous evaluation in 2010 and it deviates from the direct measurement by about 3.6 standard deviations.
Speaker: Zhiqing Philippe Zhang (LAL, Orsay (FR)) -
10:45
Experimental limiting factors for the next generation of $\mu \to e \gamma$ searches 15m
The search for the Lepton Flavor Violating decays $\mu^+ \to e^+ \gamma$ and $\mu^+ \to e^+ e^+ e^-$ will reach an unprecedented level of sensitivity within the next five years thanks to the MEG-II and Mu3e experiments. These experiments will take data at the Paul Scherrer Institut where continuous muon beams are delivered at a rate of about $10^8$ muons per seconds. On the same time scale, accelerator upgrades are expected in various facilities, making feasible to reach an intensity of $10^{10}$ muons per second. We investigate the experimental limiting factors which will define the sensitivity in the search for $\mu^+ \to e^+ \gamma$ with these extremely high beam rates. We also consider some conceptual detector design and evaluate the corresponding sensitivity as a function of the beam intensity.
Speaker: Francesco Renga (INFN Roma) -
11:00
Test of discrete symmetries with neutral kaons at KLOE-2 15m
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati (LNF) is currently taking data at the e+e- DAFNE collider which is implementing an innovative collision scheme based on a crab-waist configuration.
An integrated luminosity of 3.5 fb-1 has been already collected by KLOE-2, and at least 5 fb−1 are expected by Spring 2018.
KLOE-2 represents the continuation of KLOE with an upgraded detector and an extended physics program which includes neutral kaon interferometry and test of discrete symmetries among the main topics.Entangled neutral kaon pairs produced at DAFNE are a unique tool to test
discrete symmetries and quantum coherence at the utmost sensitivity,
in particular strongly motivating the experimental searches of possible
CPT violating effects, which would constitute an unambiguous signal of
a New Physics framework.The status of the latest ongoing analyses on KLOE/KLOE-2 data using the most
refined analyses tools will be presented and discussed:
(i) measurement of the KS semileptonic charge asymmetry and tests of CP and CPT symmetry,
(ii) test of Time reversal and CPT in transitions in Phi->KSKL->pienu,3pi0,(2pi) decays,
(iii) search for the CP violating KS->3pi0 decay.Speaker: Antonio Di Domenico (Sapienza Universita e INFN, Roma I (IT)) -
11:15
Coffee break 30m
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Lepton-flavour violation in a Pati-Salam model with gauged flavour symmetry 15m
Combining Pati-Salam (PS) and flavour symmetries in a renormalisable setup,
we devise a scenario which produces realistic masses for the charged
leptons. Flavour-symmetry breaking scalar fields in the adjoint
representations of the PS gauge group are responsible for generating different
flavour structures for up- and down-type quarks as well as for leptons.
The model is characterised by new heavy fermions which mix with the Standard
Model quarks and leptons. In particular, the partners for the third fermion
generation induce sizeable sources of flavour violation. Focusing on the
charged-lepton sector, we scrutinise the model with respect to its
implications for lepton-flavour violating processes such as $\mu \rightarrow e\gamma$, $\mu\rightarrow 3e$ and muon conversion in nuclei.Speaker: Mr Moch Paul (Theoretische Physik 1, Universität Siegen) -
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Rare strange decays at LHCb 15m
Rare decays are fundamental probes of physics beyond the Standard Model.
The expanding LHCb program of strange physics, in particular of their rare decays, provides a unique and complementary probe to test the SM with respect to the beauty and charm sector.
We present here the current status of rare decays studies at the LHCb experiment, including the new limit on the Ks -> mu mu branching fractions, and discuss a possible picture emerging from these measurements.
In addition, prospects for strange physics with the LHCb Run 2 data and after the improvements in the trigger foreseen in the LHCb Upgrade are discussed.Speaker: Miguel Ramos Pernas (Universidade de Santiago de Compostela (ES)) -
12:15
SUSY contributions in light of recent $\epsilon'/\epsilon$ 15m
Recently, the standard model prediction of $\epsilon'/\epsilon$ was
improved, and a discrepancy from the experimental results was reported
at the $2.9\sigma$ level. We study the charging contributions to $Z$
penguin especially with the vacuum stability constraint. The vacuum
decay rate is investigated, and it is shown that the discrepancy can be
explained if super particles are lighter than $4-6\mbox{TeV}$.
Correlations with $\mathcal{B}(K_L\to\pi^0\nu\bar{\nu})$ is also
discussed. We also study the gluino contributions to $Z$ penguin.Speakers: Daiki Ueda (SOKENDAI), Mr Daiki Ueda (Sokendai) -
12:30
The muon to electron conversion process and the Mu2e experiment at Fermilab 15m
The Mu2e experiment aims to measure the charged-lepton flavour violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. The conversion process results in a monochromatic electron with an energy slightly below the muon rest mass (104.97 MeV). Goal of the experiment is to improve of four orders of magnitude the previous measurement and reach a single event sensitivity of 2.5 x 10^{-17} on the conversion rate with respect to the muon capture rate.
In many of Beyond the Standard Model (BSM) scenarios, rates for CLFV processes are within the reach of the next generation of experiments and their searches
have a sensitivity to new physics that exceeds the LHC reach bringing the reach of new mass scale up to 10^4 TeV. In this contest indirected measurements of CLFV will be crucial evidence of new physics.The experiment goal is obtained with a very intense pulsed negative muon beam sent to an Aluminium target for a total number of 10^{18} stopped muons. Production and transport of the muons is done with a complicated and sophisticated magnetic systems composed by a production, a transport and a detector solenoid.
The improvement with respect to previous conversion experiments is based on four elements: the muon intensity, the beam structure layout, the extinction of out of time particles and the precise electron identification in the detector solenoid. The conversion electron will be reconstructed and separated by the Decay in Orbit (DIO) background by a very high resolution (120 keV) tracking system based on straw technology. The crystal calorimeter system will confirm that the candidates are indeed electrons by performing a powerful mu/e rejection while granting a tracking independent HLT filter. A Cosmic Ray Veto system surrounds the detector solenoid and contributes to make the cosmic based background negligible.
Speaker: Dr Stefano Miscetti (LNF -INFN) -
12:45
Precision measurement of the form factors of the charged kaon semileptonic decays $K^\pm_{l3}$ 15m
The NA48/2 experiment presents a final result of the charged kaon semileptonic decays form
factors measurement based on 4.28 million $K^\pm_{e3}$ and 2.91 million $K^\pm_{\mu 3}$ selected
decays collected in 2004. The result is competetive with other measurements in $K^\pm_{\mu 3}$
mode and has a smallest uncertainty for $K^\pm_{e3}$, that leads to the most precise
combined $K^\pm_{l3}$ result and allows to reduce the form factor uncertainty of $|V_{US}|$.Speaker: Mauro Piccini (INFN - Sezione di Perugia (IT))
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Higgs and new physics: Exotics Sala Perla (Palazzo del Casinò)
Sala Perla
Palazzo del Casinò
Conveners: ALEKSANDR AZATOV (INFN - National Institute for Nuclear Physics), Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))-
09:00
Status of Composite Higgs 30m
I will review the current status of the Composite Higgs scenarios. Discussing the advances on both theoretical and experimental sides.
Speaker: Dr Aleksandr Azatov (SISSA ) -
09:30
ATLAS Searches for VH and HH Resonances 15m
The discovery of a Higgs boson at the Large Hadron Collider (LHC) motivates searches for physics beyond the Standard Model (SM) in channels involving coupling to the Higgs boson. A search for a massive resonance decaying into a standard model Higgs boson (h) and a W or Z boson or two a standard model Higgs bosons is performed. Final states with different number of leptons and where the Higgs decays into a b-quark pair are studied using different jet reconstruction techniques which are complementary in their acceptance for low and high mass transverse momentum. This talk summarizes ATLAS searches for diboson resonances including at least one H bosons in the final state with LHC Run 2 data.
Speaker: Wade Cameron Fisher (Michigan State University (US)) -
09:45
Search for diboson resonances decaying into W, Z and H bosons at CMS 15m
Beyond the standard model theories like Extra-Dimensions and Composite Higgs scenarios predict the existence of very heavy resonances compatible with a spin 0 (Radion),spin 1 (W’, Z’) and spin 2 (Graviton) particle with large branching fractions in pairs of standard model bosons and negligible branching fractions to light fermions. We present an overview of searches for new physics containing W, Z or H bosons in the final state, using proton-proton collision data collected with the CMS detector at the CERN LHC. Many results use novel analysis techniques to identify and reconstruct highly boosted final states that are created in these topologies. These techniques provide increased sensitivity to new high-mass particles over traditional search methods.
Speaker: Clemens Lange (CERN) -
10:00
Exotic signatures of new gauge bosons 15m
New gauge bosons with renormalizable couplings to quarks but not to leptons must interact with additional fermions ("anomalons") required to cancel the gauge anomalies. Analyzing the decays of such leptophobic bosons into anomalons, I show that they produce final states involving leptons at the LHC. Resonant production of a flavor-universal leptophobic Z′ boson leads to cascade decays via anomalons, whose signatures include Higgs or electroweak bosons, and missing energy. A Z′ boson that couples to the right-handed quarks undergoes cascade decays that violate lepton universality and include signals with two leptons and Higgs bosons.
Speaker: Bogdan Dobrescu (Fermilab) -
10:15
ATLAS Searches for VV/V+gamma Resonances 30m
Many extensions to the Standard Model predicts new particles decaying into two bosons (WW, WZ, ZZ, Zgamma) making these important signatures in the search for new physics. Searches for such diboson resonances have been performed in final states with different numbers of leptons, photons and jets where new jet substructure techniques to disentangle the hadronic decay products in highly boosted configuration are being used. This talk summarizes ATLAS searches for diboson resonances with LHC Run 2 data collected in 2015 and 2016.
Speaker: Kalliopi Iordanidou (Columbia University (US)) -
10:45
Large scale separation and hadronic resonances from a new strongly interacting sector 15m
Many theories describing physics beyond the Standard Model rely on a large separation of scales. Large scale separation arises in models with mass-split flavors if the system is conformal in the ultraviolet but chirally broken in the infrared. Because of the conformal fixed point, these systems exhibit hyperscaling and a highly constrained resonance spectrum. We derive hyperscaling relations and investigate the realization of one such system with four light and eight heavy flavors. Our numerical simulations confirm that both light-light and heavy-heavy resonance masses show hyperscaling and depend only on the ratio of the light and heavy flavor masses. The heavy-heavy spectrum is qualitatively different from QCD and exhibits quarkonia with masses not proportional to the constituent quark mass. These resonances are only a few times heavier than the light-light ones, which would put them within reach of the LHC.
Speaker: Oliver Witzel (University of Edinburgh) -
11:00
Coffee break 30m
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Search for vector-like quarks 15m
Vector like quarks appear in many theories beyond the Standard Model as a way to cancel the mass divergence for the Higgs boson. The current status of the ATLAS searches for the production of vector like quarks will be reviewed for proton-proton collisions at 13 TeV. This presentation will address the analysis techniques, in particular the selection criteria, the background modeling and the related experimental uncertainties. The phenomenological implications of the obtained results will also be discussed.
Speaker: Olaf Nackenhorst (Universite de Geneve (CH)) -
11:45
Search for vector-like quarks and excited quarks at CMS 15m
We present results of searches for massive top and bottom quark partners using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 and 13 TeV. These fourth-generation vector-like quarks are postulated to solve the Hierarchy problem and stabilize the Higgs mass, while escaping constraints on the Higgs cross section measurement. The vector-like quark can be produced singly or in pair and their decays result in a variety of final states, containing top and bottom quarks, gauge and Higgs bosons. We search using several categories of reconstructed objects, from multi-leptonic to fully hadronic final states. We set exclusion limits on both the vector-like quark mass and cross sections, for combinations of the vector-like quark branching ratios.
Speaker: Giorgia Rauco (Universitaet Zuerich (CH)) -
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Search for heavy resonances decaying to top quarks 15m
Searches for new resonances that decay either to pairs of top quarks or a top and a b-quark will be presented. The searches are performed with the ATLAS experiment at the LHC using proton-proton collision data collected in 2015 and 2016 with a centre-of-mass energy of 13 TeV. The invariant mass spectrum of hypothetical resonances are examined for local excesses or deficits that are inconsistent with the Standard Model prediction.
Speaker: Saverio D'Auria (University of Glasgow (GB)) -
12:15
Search for new resonances coupling to third generation quarks at CMS 15m
We present a search for new massive particles decaying to heavy-flavour quarks with the CMS detector at the LHC. The prominent signature is the resonant production of top quark pairs. Decay channels to vector-like top partner quarks, such as T', are also considered for the first time. We use proton-proton collision data recorded at a centre-of-mass energy of 13 TeV. The search is performed in both hadronic and semileptonic decay channels of the top quark or of the top-partners. Due to the high momentum range in which these objects are produced, specific reconstruction algorithm and selections are employed to address the identification of these boosted signatures.The results are presented in terms of upper limits on the model cross section.
Speaker: Johannes Haller (Hamburg University (DE)) -
12:30
Searches for new physics in lepton+jet final states 15m
Results of searches for new particles such as leptoquarks, heavy neutrinos, and W bosons with right-handed couplings in final states with leptons (charged or neutral) and jets are presented. The emphasis is given to the recent results obtained using data collected in the 2016 run of the LHC.
Speaker: Marc Stover (Hamburg University (DE)) -
12:45
Searches for new phenomena in final states involving leptons and jets using the ATLAS detector 15m
Many theories beyond the standard model predict new phenomena which decay to leptons and jets. Searches for new physics models with these signatures are performed using the ATLAS experiment at the LHC. The results reported here use the pp collision data sample collected in 2015 and 2016 by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
Speaker: Paolo Mastrandrea (Centre National de la Recherche Scientifique (FR))
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Outreach, education, diversity Room Mangano (Palazzo del Casinò)
Room Mangano
Palazzo del Casinò
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Outreach initiatives in Colombia in the LHC era 15m
The High Energy physics community in Colombia and in Latin America in general is steadily growing with stronger Physics programs and a larger participation in worldwide international collaborations and experiments. Along with these developments, great effort is being put into education and outreach activities that inspire the public and motivate the next generation of students to pursue a career in science. The ATLAS Latin American masterclasses have been running for two years now, and Physics without Frontiers projects in Colombia and Venezuela are paving the way for more outreach initiatives in the region. All these activities are gathering more momentum every year, boosting the development of physics programs in the region.
Speaker: Carlos Sandoval Usme (Universidad Antonio Narino (CO)) -
09:15
Go to the astroparticle physics school with the Toledo Metro Station Totem-Telescope for cosmic rays 15m
Among the scientific divulgation activities of National Institute of Nuclear Physics of Naples (INFN-NA), the installation of the underground cosmic radiation telescope at the Toledo Metro Station in Naples in 2014 had a major impact on territory. The detector,consisting of 10 xy scintillator planes, read by SiPM, was developed by the National Laboratory of the Gran Sasso (LNGS), and installed together INFN-NA researchers and the Department of Physics of the Federico II University (DIPFIS-UNINA), in collaboration with Azienda Napoletana Mobilità (ANM). It allows observing the cosmic particles that reach 40 meters of depth in the Station through the LEDs that indicate the trajectory of the particles. At the end of September 2016, as part of Notte Europea dei Ricercatori, the telescope was upgraded with a multimedia Totem, provides videos on cosmic ray physics, as well as on the activities of INFN and other project partners. The initiative sees engaged INFN-NA, LNGS, DIPFIS-UNINA, ANM and Rotary International. An important aspect is the real-time analysis of Totem's telescope data, which allows the public to show the tracks of the muons. The accumulated data, transmitted to the Web site of INFN-NA, are accessible to the students for educational purposes. A competition was launched at High Secondary Schools, sponsored by Ufficio Scolastico Regionale (USR), with the aim of engaging teachers and students in astroparticle physics projects. The students, preparing their own elaborates as posters,computer presentations,artefacts and didactic experiments, will expose to the public during the 4 days of Futuro Remoto (May 25-28, 2017 http://www.cittadellascienza.it/futuroremoto/2017). The Totem and its connection to the Toledo telescope open new perspectives for communication and dissemination of scientific culture especially for the students through the technique of learning by doing, realizing and presenting the work created, also through the Alternanza Scuola-Lavoro.
Speaker: Carla Aramo (INFN - Napoli) -
09:30
THE ROLE OF IMAGES IN THE STORYTELLING OF THE INVISIBLE 15m
As particle physicists are, even those who work on the communication on particle physics are always involved with the traces of something. Images have an increasingly important function in communication through both traditional and new media, and play an even more relevant role in building a good storytelling. Unfortunately - that’s a well-known evidence - particles and forces of nature are not generous in offering images of themselves, and although they determine our universe and even our existence, they are not really familiar objects. The story of particles is so time by time a new challenge: that’s well-known for those who work in the Communications Offices of Scientific Institutes devoted to research in this field, which has to deal daily with both the constraints of institutional communication and the need to communicate an accessible message in a passionate way, in order to reach ever new audiences. Research and experimentation of different ways to communicate have led to the birth of conference-show projects, in which artistic performances intertwine with the scientific narrative, like it happens in the public events, recently produced by INFN, “Cosmic Tale” or “What I do not know”. But also art exhibitions that, thanks to a proper scenography realized through videos and interactive multimedia installations, seek to create realistic environments. The goal is to allow the public to immerse themselves in a metaphorical storytelling of scientific concepts. This is what happens with the installations “Spacetime”, "Higgs Boson" or “Universe Expansion”. Thus, the interweaving of different communication languages, from the scientific dialogue to the use of metaphors, images or cartoons, music and performing arts, can accompany the public to the discovery of some of the most fascinating ideas of the contemporary physics: from the discovery of gravitational waves to the search for Dark Matter, from Albert Einstein's General Relativity to the wave-particle duality.
Speaker: Francesca Scianitti (INFN Communications Office) -
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« La Nuit des ondes gravitationnelles » : a multi-site outreach event about gravitational waves 15m
On Monday March 20th 2017, an outreach event dedicated to the gravitational waves and their recent discovery by the LIGO-Virgo collaboration took place. Jointly organized by the “Centre National de la Recherche Scientifique” (CNRS) and the “Société Française de Physique » (SFP), it was targeting the general audience with an emphasis on high-school students and teachers. The key feature of this project was to be multi-site, meaning that the event would take place simultaneously in a dozen French cities, plus the French Institute in Firenze (Italy), close to the site of the Virgo experiment. The project was also meant to be interactive, with all sites connected through a videoconference for a Q&A session with scientists, a quiz and finally a conference about astrophysics in the cinema. The event was also broadcasted live on the web, via a webcast system and the social medias. In addition, four contests (science and arts) open to anyone (schools and the general audience) were organized.
Speaker: Nicolas Arnaud (LAL (CNRS-IN2P3)) -
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The “Beamline for Schools” competition at CERN 15m
In 2014 CERN has started to organize “Beamline for Schools” (BL4S), an annual physics competition for high school students aged 16 and up. In the competition, teams of students from all around the world are invited to propose an experiment to CERN that makes use of a secondary beam of particles with momenta of up to 10 GeV/c from CERN’s Proton Synchrotron (PS). The students have to describe their experiment in a document of up to 1000 words and to complement their application with a 1-minute video. CERN provides a number of various detectors, magnets and other components to the students and allows them to bring their own equipment. In the first three years of the competition, more than 5500 students from all around the world have participated and in total six winning teams have been selected and have been invited to CERN for 12 days each. Every year two CERN scientists, together with the students prepare and operate the winner’s experiments.
We will describe the challenges linked to the Beamline for Schools competition, focussing on the communication with all teams in the preparatory phase of the competition, the technical implementation of the winning experiments, the operation of the experiments as well as on the support for the teams analysing the data and preparing publications of the results. We will also report on the impact of the competition onto the students, the outside world but also onto the CERN laboratory. BL4S receives mayor support from private donators with the help of the CERN and Society Foundation. Experience with the funding scheme will also be reported.
Finally, we will present an outlook for the future of the BL4S competition, taking into account the shutdown of the accelerators at CERN in 2019 and 2020.Speaker: Markus Joos (CERN) -
10:15
3D-Printable Experiments in CERN’s S’Cool LAB 15m
S’Cool LAB (http://cern.ch/s-cool-lab) is an international out-of-school hands-on particle physics learning laboratory at CERN, Geneva, Switzerland. It aims to give an insight into the working methods, technologies, and research of the world's largest particle physics laboratory and to make CERN’s physics and technologies understandable for high-school students through hands-on experimentation. In 2016, almost 6000 high-school students and their teachers from more than 30 different countries took part in hands-on workshops in S’Cool LAB.
The topic of particle physics is rarely addressed in high-school curricula. One of the reason cited by teachers is a lack of suitable classroom experiments, especially because the high-tech equipment used in today's particle physics experiments is too expensive for standard high schools. Well-equipped out-of-school learning places like S’Cool LAB can close this gap and provide hands-on experience for visiting students. In addition to workshops on-site, the S’Cool LAB team is developing low-cost do-it-yourself equipment, which will hopefully support teachers in their challenging endeavour of introducing particle physics in their own classroom.
3D printing technology in particular has the potential to revolutionize the way physics is taught, because it makes it much easier to design and produce customized parts for school experiments or to build new prototypes. Using this technology, many hands-on experiments suddenly become affordable and easily available.
In this talk, we will present S’Cool LAB and its offers for schools from around the world. We will also present two 3D-printable hands-on experiments, a functional model of the toroidal ATLAS magnet system and a particle trap, and discuss their educational use.
Speaker: Julia Woithe (CERN) -
10:30
An introduction to the Higgs mechanism based on classical physics secondary school curriculum 15m
The Higgs mechanism is introduced in a completely classical framework in which the concept of energy is reviewed. After a brief review of the classical energy of a particle in a gravitational or electromagnetic fields, we show that postulating the existence of a new field (the Higgs field) one can easily introduce a new term in the energy that is consistent with the relativistic energy at rest of a particle, making the mass of a particle the result of a dynamic effect of the interaction with a scalar field. Our model also gives rise to interaction terms between particles and the new field, as well as to the mass of such a field (i.e. to the Higgs boson).
Our approach allows a formal introduction of the Higgs field dynamics, much similar to other topics of classical textbooks, that does not require any knowledge of quantum field theory.
Speaker: Giovanni Organtini (Sapienza Universita e INFN, Roma I (IT)) -
10:45
The challenge of explaining new physics concepts and phenomena 15m
With the advent of higher energies and higher collision rates the LHC continues the exciting voyage towards new physics, allowing physicists all over the world to explore a previously unknown territory full of promise.
So far the IPPOG international masterclass developers, with the help of physicists and in close contact with teachers, have been successful in designing educational material and in engaging high school students to work, with real LHC data, on current hot topics, such as the discovery of the Higgs boson.
One of the current challenges is to convey advanced physics concepts and to introduce new ideas beyond today’s theoretical framework describing the content of the Universe and its evolution. How can we influence the teaching at schools in order to provide a better basis for attending masterclass-like events, and in general for understanding experimental results and new theoretical ideas?
An IPPOG initiative deals with effective ways of explaining new physics. Moreover, physicists, in close contact with high school teachers and university departments of education, are investigating a more professional and research-based view on methods and ideas for introducing and explaining new physics concepts. A program plan together with relevant material must be created and incorporated to suit the high school curriculum and even replace the ordinary text book on the subject.
This talk will suggest how educational material could be improved and extended to cover crucial topics and concepts and to better accommodate real learning at the Masterclasses and similar events, and to facilitate the understanding of new results as they keep streaming from the LHC and other current and future research instruments. This is crucial in explaining new physics concepts and related enigmas such as dark matter, the role of gravity at the quantum scale, the possible unification of all fundamental forces and the physics of the early Universe.
Speaker: Eirik Gramstad (University of Oslo (NO)) -
11:00
Coffee break 30m
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11:30
Outreaching particle physics to Latin America: CEVALE2VE and the use of ATLAS open data 15m
Particle physics outreach can play a key role in promoting scientific culture and in the modernisation of university education in Latin America. In this context, the CEVALE2VE virtual community (Centro de Altos Estudios de Altas Energías in Spanish) builds collaborative networks with and between Latin American institutions and motivates physics undergraduate and master students to consider a career in scientific research by introducing them to cutting-edge research and tools used in High Energy Physics (HEP).
The ATLAS open data project has been fundamental to achieve these goals as one of our main educational tools. As part of its commitment to open access and public engagement the ATLAS experiment has made available a large dataset to the public for the first time in 2016 and CEVALE2VE have been using this dataset for HEP virtual courses and Physics Without Frontiers roadshows.
In this contribution we will present the different activities hosted by CEVALE2VE and discuss the importance of using open data and open software to reach strong young students lacking exposure to particle physics research.Speaker: Reina Coromoto Camacho Toro (University of Chicago (US)) -
11:45
Particle Physics for Primary Schools – enthusing future Physicists 15m
In recent times the realisation that children make decisions and choices about subjects they like during their primary school years became widely understood. For this reason academic establishments focus many of their outreach activities towards the younger ages. During the last academic year we designed and trialled a particle physics workshop for primary schools. The workshop allows young children (ages 8-11) to learn the world of particles, use creative design to make particle models and engage in creative writing to describe how particles interact with each other. The workshop has been trialled in many local primary schools, receiving positive evaluation. The resources were improved and completed, based on the feedback given by the primary school teachers.
Speakers: Maria Pavlidou (University of Birmingham), Dr Maria Pavlidou -
12:00
PHYSICS ON SOCIAL MEDIA: IMPACT AND INTERACTION TO DEAL WITH FAST COMMUNICATION 15m
Traditional communication channels are now co-living with new ones, such as social media. These are channels through which communication is fast, impactful and interactive. It’s commonly thought that they are mainly used by young people, but now there is an additional increasingly high demand of reliable and easy to understand information on social media by adults. Scientific research results need hence to be easy to find on these channels by those that are familiar with them but also by those publics that are starting now to approach these channels.
These are the reasons why, in order to provide accurate and reliable information, scientific research institutes need to be able to adopt a communication strategy appropriate for social media. These channels require indeed an approach that is different from the ‘traditional communication’ one, they need to provide information quickly, interactively and they can never be silent, this means that even when scientific institutes are not able to release breaking news they need to provide users of information that is not yet very well known. At INFN, these three requirements have led to the creation of new communication strategies that are based on two concepts: interaction and impact. INFN has created a series of weekly appointments that through an images-storytelling unveil the work that is daily done at the institute. Moreover, it has planned a series of interactive interviews, Facebook lives, that allow the public to directly ask questions to the first actors in the research field.
To reach an increasingly higher public and to meet the new public demands scientific research institute have hence to be strongly present on these new communication channels, social media.Speaker: Francesca Mazzotta -
12:15
Working with the media - The role of the Public Information Officer - 15m
Informing science and also nurturing the sympathy to scientific activities could be an important background to raise the fund, recruit staff and acquire the land to build the large research infrastructures. Mass media plays an important role in this communication, that is, the media relation is very important for scientific community to build good relation with the general public, and public information officer (PIOs) play a big role and help in the relations.
Then what is “media relations”? It is the activity to build trusting relationships with reporters, and foster mutual understanding, sometimes acting as source of informal advice. It is to proactively inform the media of news, by issuing press releases and so on. It is to disseminate the news, by interviews by email or phone, face to face, or in front of the camera.
When informing the media of science, there are some points to note. First, scientists are encouraged to show the overview or the background of science or the importance or the meaning of it, and to make it clear what is the point.
Actually the media report not only scientific results. They cover how the research activities are going on, such like construction of the facilities. They are also interested in the humanities of scientists itself or the background of the scientific activities.
And PIOs will help scientists. PIOSs will build relationships with the media, by providing background and identifying the key points. They supplement what scientists did not say. They translate the jargons. They know how to consider that there are some cultural or local differences in reporting. As such, PIOs try to open the door and welcome the media to science.
In this way, scientists can rely on PIOs in making media relations in making better relations between scientific community and the general public.
It would be better to consider that there are some cultural or local differences in reporting.
Speaker: Saeko Okada (KEK) -
12:30
Discussion panel on science communication in HEP 30m
Communicating HEP results to the general public often relies upon a simplification of the physics behind it. In the long term can be this an issue e.g. for resources given by the funding agencies.
Speakers: Francesca Scianitti (INFN-National Institute for Nuclear Physics, Italy), Giovanni Organtini (Sapienza Universita e INFN, Roma I (IT)), Ms Lucy Stone (STFC), Matthew Chalmers (CERN)
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QCD and hadronic physics Room Mosaici-1 (Palazzo del Casinò)
Room Mosaici-1
Palazzo del Casinò
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09:00
Recent results from the SND detector 15m
Recent results on study of exclusive processes of $e^+e^-$ annihilation into hadrons below 2 GeV obtained at the SND detector are presented. The analyses are based on data collected at the VEPP-2M and VEPP-2000 colliders. In particular, we present the precise measurements of the $e^+e^-\to \pi^0\gamma$ and $e^+e^-\to K^+K^-$ cross sections, and the first measurments of the $e^+e^-\to \omega\pi^0\eta$ and $e^+e^-\to \pi^+\pi^-\pi^0\eta$ reactions.
Speaker: Prof. Vladimir Druzhinin (NSU/BINP, Novosibirsk) -
09:15
Study of the e+e- -> hadrons reactions with CMD-3 detector at VEPP-2000 collider 15m
The CMD-3 detector is taking data at the VEPP-2000 e+e
collider (BINP, Novosibirsk, Russia). The CMD-3
is the general purpose particle magnetic (1.3 T) detector, equipped with
the tracking system, two crystal (CSI and BGO) calorimeters, liquid Xe
calorimeter, TOF and muon systems. The main goal of experiments with CMD-3
is the measurement of the cross-sections and dynamics of the exclusive
modes of e+e-->hadrons reactions. In particular, these results provide
important input for the calculation of the
hadronic contribution to the muons anomalous magnetic moment.
First round of data taking with the CMD-3 detector at the VEPP-2000 e+e
collider was performed in 2011-2013 with about 60
1/pb integrated luminosity in the energy range from 0.32 to 2.0 GeV
in c.m. Amount of collected data exceeds all previous experiments.
The beam energy was continuously measured concurrently with the
data taking using a Compton backscattering system.Here we present the survey of new and published analysis results,
including precise measurement of e+e-->pi+pi- reaction, as well as other
hadron final states with up to six pions or states include two kaons.At the end of 2016 the VEPP-2000 collider resumed operations after upgrade
of the injection system, and a performance close to the project
luminosity of 10^32 cm-2s-1 at 2 GeV has been demonstrated. First
preliminary results of new 2017 run are also presented.Speaker: Prof. Evgeny Solodov (BudkerINP, Novosibirsk State University) -
09:30
Light meson spectroscopy at BESIII 15m
The unambiguous identification and systematic study of bound states beyond the constituent quark degrees of freedom, e.g., multiquark states or states with gluonic degrees of freedom (hybrids, glueballs) would provide validation of and valuable input to the quantitative understanding of QCD. Hadron spectroscopy is one of the most important physics goals of BESIII. Since 2009, BESIII has collected 1.3 10^8 J/psi and 0.410^8 of psi', which are the world's largest data samples of J/psi and psi' from e+e- collision. Radiative decays of charmonium provide a gluon-rich environment and are therefore regarded as one of the most promising hunting grounds for gluonic excitations. Significant progresses in the light-quark sector have been made with the unprecedented high statistics data sets. Several recent results on light hadron spectroscopy and light hadron decays will be reported, including:
1, the observation of the anomalous line shape of X(1835) near pp mass threshold and related studies; 2, studies of glueballs in J/psi radiative decays; 3, search for 1- + exotic in chi_c1->eta pi pi.Speaker: Francesca De Mori (INFN - National Institute for Nuclear Physics) -
09:45
Recent QCD results from the BaBar experiment 15m
We report some of the most recent results in studying different aspects of QCD with about 500 fb$^-1$ of data collected by the BaBar experiment at the e+e- $B$-factory PEP-II.
In particular, we present Dalitz plot analyses of the hadronic three-body $J/\psi$ decays to $\pi^+\pi^-\pi^0$, $K^+K^-\pi^0$, and $K_S K^{\pm}\pi^{\mp}$ using an isobar model and a Veneziano model. We then show the results of a search for the $B$-meson decay to four baryons $B \to p \bar{p} p \bar{p}$, which might help shedding some light on the mechanism of hadron fragmentation into baryons, and on the experimental difference between the inclusive branching fraction of $B$-meson decay to baryons and the sum of the exclusive baryonic $B$ decays. We also present a high precision measurement of the mass difference between the $D^*(2010)^+$ and $D^+$ mesons using the decay chain $D^*(2010)^+ \to D^+ \pi^0$, with $D^+ \to K^- \pi^+ \pi^+$ , which largely improve the knowledge of this parameter.Speakers: Laura Zani, Laura Zani (INFN - National Institute for Nuclear Physics) -
10:00
Recent QCD results from the Belle experiment 15mSpeaker: Marko Bracko (Jozef Stefan Institute)
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10:15
Loop corrections to pion and kaon production 15m
In this talk we present results of our study of the next-to-leading order corrections to deeply virtual pion and kaon production in neutrino experiments. We estimate these corrections in the kinematics of the Minerva experiment at FERMILAB, and find that they are sizable and increase the leading order cross-section by up to a factor of two. Also, we estimate the cross-sections of the charged-current mediated pion and kaon production in electron-induced processes.
Speaker: Marat Siddikov (Universidad Santa Maria) -
10:30
New mechanisms in the production of two $J/\psi$ quarkonia in proton-proton scattering at the LHC. 15m
The presentation will be based on our paper in preparation [1].
We discuss production of pairs of $J/\psi$ in pp collisions in the context
of recent results obatained at the LHC at large transverse momenta.
The leading-order $O(\alpha_s^4)$ contribution
is calculated in both collinear and the $k_t$-factorization approach
with the KMR UGDF.
We include also two-gluon exchange contribution
($O(\alpha_s^6)$) (not included routinely).
This contribution is calculated only in the collinear approximation.
In addition we calculate cross sections for
$p p \to \chi_c(J_1) \chi_c(J_2)$.
A feed-down from double $\chi_c$ production to double $J/\psi$
production is estimated for a first time.
The double parton scattering cross section and differential
distributions are calculated using a parametrization
of experimental $J/\psi$ differential distributions in rapidity
and transverse momentum.
Results of our calculations are compared with very recent ATLAS data [2].
We find that the two-gluon exchange mechanism and feed down from
double $\chi_c$ production lead to very similar
distributions in rapidity distance between the $J/\psi$
mesons as for DPS.
Much larger cross sections are obtained in the $k_t$-factorization approach.
Including the mechanisms leaves much less room for the DPS contribution which cannot be calculated from first principle.
The $\sigma_{eff}$ parameter for DPS needed to describe the ATLAS data
is much larger than from previous analyses of double
quarkonium production, where a smaller number of mechanisms was included.
We present distributions in rapidity distance, two $J/\psi$ invariant
mass, azimuthal angle correlations between the two $J/\psi$ mesons
and transverse momentum of the pairs of quarkonia.
Ihe sum of the four considered contributions reminds
experimental ATLAS distributions.1) A. Cisek, W. Sch\"afer and A. Szczurek, a paper in preparation.
2) ATLAS collaboration,
CERN-EP-2016-211, arXiv:161202950.Speakers: Antoni Szczurek (Institute of Nuclear Physics), Wolfgang Schaefer (Institute of Nuclear Physics PAN) -
10:45
Quarkonium Hybrids with Nonrelativistic Effective Field Theories 15m
I will discuss spectroscopic properties of heavy quarkonium hybrids
derived in the last year in the systematic framework of nonrelativistic effective field theories. Results will be compared with data and lattice determinations.Speaker: Antonio Vairo -
11:00
Coffee break 30m
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11:30
Charm and beauty production at HERA (H1) 15m
Measurements of open charm production are presented in diffractive deep inelastic scattering (5<Q2<100 GeV2), based on 287 pb−1 of H1 HERA-II data recorded at the center of mass energy sqrt(s)=319 GeV. The event topology is given by ep→eXY , where the system X, containing at least one D⋆(2010) meson, is separated from a leading low-mass proton dissociative system Y by a large rapidity gap. The kinematics of D⋆ candidates are fully reconstructed in the D⋆→Kππ decay channel. The measured cross sections are compared at the level of stable hadrons with next-to-leading order QCD predictions obtained in the massive scheme, where the charm quark is produced via the boson-gluon fusion. The calculations rely on the collinear factorization theorem and are based on diffractive parton densities previously obtained by H1 from fits of the inclusive diffractive cross sections. The measured data are further used to estimate the ratio of diffractive to inclusive open charm production in deep inelastic scattering.
Measurements of open beauty and charm production cross sections in deep inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections for beauty and charm production are obtained in the kinematic range of photon virtuality 2.5<Q2<2000 GeV2 and Bjorken scaling variable 3×10−5<x<5×10−2. The combination method accounts for the
correlations of the systematic uncertainties among the different data
sets. The combined data are compared to perturbative QCD predictions.Speaker: Stefan Schmitt (Deutsches Elektronen-Synchrotron (DE)) -
11:45
Investigation of high-mass hadrons at HERA 15m
A search for a narrow baryonic state in the $pK_S^0$ and $\bar{p}K_S^0$ system has been performed in $ep$ collisions at HERA with the ZEUS detector using an integrated luminosity of 358 pb$^{−1}$ taken in 2003-2007. The search was performed with deep inelastic scattering (DIS) events at an $ep$ centre-of-mass energy of 318 GeV for exchanged photon virtuality, $Q^2$, between 20 and 100 GeV$^2$. Contrary to evidence presented for such a state around 1.52 GeV in a previous ZEUS analysis using a sample of 121 pb$^{−1}$, taken in 1995–2000, no resonance peak is found in the $p(\bar{p})K_S^0$ invariant-mass distribution in the range 1.45–1.7 GeV. Upper limits on the production cross section are set for different assumptions on the width of the resonance.
The exclusive deep inelastic electroproduction of ψ(2S) and J/ψ(1S) at an ep centre-of-mass energy of 317 GeV has been studied with the ZEUS detector at HERA in the kinematic range 2 < Q2 < 80 GeV2, 30 < W < 210 GeV and |t| < 1 GeV2, where Q2 is the photon virtuality, W is the photon--proton centre-of-mass energy and t is the squared four-momentum transfer at the
proton vertex. The data for 2 < Q2 < 5 GeV2 were taken in the HERA I running period and correspond to an integrated luminosity of 114 pb−1. The data for 5 < Q2 < 80 GeV2 are from both HERA I and HERA II periods and correspond to an integrated luminosity of 468 pb−1. The decay modes analysed were μ+μ− and J/ψ(1S)π+π− for the ψ(2S) and μ+μ− for the J/ψ(1S). The cross-section ratio σ(ψ(2S))/σ(J/ψ(1S)) has been measured as a function of Q2, W, and t. The results are compared to predictions of QCD-inspired models of exclusive vector-meson production.Speaker: Luca Stanco (Universita e INFN, Padova (IT)) -
12:00
Exotic multi quark states and measurement of the forward-backward asymmetry of baryon production in $p\bar p$ collisions at D0 15m
We use the full Run II dataset consisting of $10.4\ \rm fb^{−1}$ of $p\bar p$ collisions recorded by the D0 detector at the Fermilab Tevatron collider at $\sqrt s=1.96\ $TeV to search for new exotic multiquark states. We report the evidence of a new state X(5568) decaying to $B^0_s\pi$ seen in the $B^0_s \to J/\psi\phi$ decay channel and its independent confirmation in the semi-leptonic channel $B^0_s \to \mu^{\pm} D_s^{\mp}X$. We also report on the search
for other exotic states.
We also study the forward-backward production asymmetries of baryons (Λ,Λb,Λc,Ξ,Ω) produced in proton antiproton collisions at s√=1.96 TeV recorded by the D0 detector at the Fermilab Tevatron collider. The forward-backward asymmetries are measured as a function of rapidity. We confirm that the production ratio of backward to forward events, measured by several experiments with various targets and a wide range of energies, is a universal function of "rapidity loss", i.e., the rapidity difference between the beam proton and the baryon, when the baryon shares a diquark with the protonSpeaker: Bruce Hoeneisen (Universidad San Francisco de Quito) -
12:15
Updated LHCb measurements on pentaquark and tetraquark states 15m
After the unambiguous confirmation of the resonant behaviour of the Zc(4430) charmonium-like state and the observation of two pentaquark states, it is a main goal for the heavy flavour experiments to complete the picture with searches for the many partners the quark model predicts. We report on several studies of b-hadron decay modes potentially involving exotic intermediate states, including new results from studies of three-body final states involving two open-charm particles, the first results to be obtained in this class of decays at the LHC. Prospects for a more robust determination of the pentaquark final states are also discussed.
Speaker: Olaf Steinkamp (Universitaet Zuerich (CH)) -
12:30
Exotic spectroscopy 15m
Theoretical results on heavy meson exotic spectroscopy will be presented mainly concentrating on hybrid heavy charmonia and bottomonia states. Theoretical results
for heavy hybrids states, c-antic-gluons systems, will be compared with experimental data. Finally the emerging differences for exotic mesons when described as compact tetraquarks, hybrid mesons, molecules or core mesons plus higher Fock components will be discussed.References:
Heavy quarkonium hybrids from Coulomb gauge QCD,
P. Guo, A. P. Szczepaniak, E. Santopinto, Phys.Rev. D78 (2008) 056003Quark structure of the X(3872)X(3872) and χb(3P)χb(3P) resonances
J. Ferretti, G. Galatà , E. Santopinto, Phys.Rev. D90 (2014) no.5, 054010E. Santopinto et al., Phys.Lett. B759 (2016) 214-217
Speakers: Elena Santopinto (INFN Sezione di Genova and Universita' di Genova), Elena Santopinto (INFN e Universita Genova (IT)) -
12:45
Exotic states and their properties from QCD sum rules 15m
We show that the correlation functions involving exotic tetra- and penta-quark currents in QCD have fundamentally different properties compared with the correlation functions of the bilinear quark current, the interpolating currents for the normal hadrons. Taking into account the fact, that the exotic currents of different structures may be used as the interpolating currents for one and the same exotic hadron, we derive a number of rigorous self-consistency conditions which lead to the selection of the appropriate diagrams for constructing QCD sum rules for the exotic states. We demonstrate that the calculation of the radiative corrections is mandatory for a consistent sum-rule analysis of the exotic states.
Speaker: Dmitri Melikhov (HEPHY)
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QFT and string theory Room Welles (Palazzo del Casinò)
Room Welles
Palazzo del Casinò
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09:00
UV properties of higher dimensional operators in Higgs Effective Field Theories from hidden symmetries 20m
We present a systematic approach to the classification of the UV properties of higher dimensional operators spanned by $\Phi^\dagger \Phi$ and ordinary derivatives thereof (e.g. $\partial_\mu (\Phi^\dagger \Phi)\partial^\mu (\Phi^\dagger \Phi) , (\Phi^\dagger \Phi)^3, (\Phi^\dagger \Phi)^4, \dots$) in Higgs Effective Field Theories. The procedure is purely algebraic and thus regularization-independent. It relies on a novel set of hidden symmetries that can be formulated in an extended field space where the singlet $\Phi^\dagger \Phi$ is treated as a dynamical variable. The resulting relations stemming from such symmetries are valid to all orders in the loop expansion. Several applications to one-loop processes are considered.
Speaker: Andrea Quadri (INFN, Sez. di Milano) -
09:20
Towards an asymptotically safe completion of the Standard Model 20m
We explore a possibility to UV-complete the Standard Model in an asymptotically safe manner. We assume the existence of $N_F$ new types of vector-like fermions which minimally couple to $SU(3)_C$ and/or $SU(2)_L$ and modify the running of the corresponding gauge couplings in such a way that at least one of them is not asymptotically free anymore. If additionally the BSM fermions carry a non-zero hypercharge, the $U(1)_Y$ gauge coupling can become asymptoticaly free, thus avoiding the problem of the Landau Pole.
We classify the emerging UV fixed points and discuss their dependence on transformation properties of the new fermions under the gauge symmetries. We also show that additional constraints on the structure of the BSM sector arise if one requires an asymptotically safe UV fixed point to be connected to the Standard Model through a well-defined RG trajectory.
Finally, we discuss experimental signatures of the asymptotically safe scenarios.Speaker: Kamila Kowalska (TU Dortmund) -
09:40
Four-dimensional regularization of higher-order computations: FDU approach 20m
We have recently proposed a new regularization framework based on the loop-tree duality theorem. This theorem allows to rewrite loop level amplitudes in terms of tree-level like structures and phase-space integrations. In consequence, it is possible to combine naturally real and virtual contributions at integrand level. Moreover, by introducing a proper momentum mapping, a complete local cancellation of infrared singularities is achieved, by-passing the necessity of counter-terms. In this talk, we explain the implementation of this novel approach to compute some physical processes, and we show how to deal with both infrared and ultraviolet divergences without using DREG.
Speaker: German Sborlini (Università di Milano, INFN Sezione Milano and IFIC-Valencia) -
10:00
Thermalization of a strongly interacting non abelian plasma 20m
The thermalization process of an out-of-equilibrium boost-invariant strongly interacting non-Abelian
plasma is investigated using a holographic method. Boundary sourcing, a distortion of the boundary metric,
is employed to drive the system far from equilibrium. Thermalization is analyzed in the fully dynamical
system through nonlocal probes: the equal-time two-point correlation function of large conformal
dimension operators in the boundary theory, and Wilson loops of different shapes. A dependence of
the thermalization time on the size of the probes is found, which can be compared to the result of local
observables: the onset of thermalization is first observed at short distances.Speakers: Fulvia De Fazio (INFN Sezione di Bari), Fulvia De Fazio (Universita e INFN, Bari (IT)) -
10:20
Renormalization in large-N QCD is incompatible with open/closed string duality 20m
Solving by a string theory the 't Hooft large-$N$ expansion of QCD is a long-standing problem that resisted all the attempts despite the advent of the celebrated gauge/gravity duality in the framework of string theory. We demonstrate that in the canonical string framework such a solution does not actually exist because an inconsistency arises between the renormalization properties of the Yang-Mills (YM) and QCD S matrix at large-$N$ recently worked out in Phys. Rev. D 95, 054010 and the open/closed duality of the would-be canonical string solution.The ultraviolet (UV) finiteness of the large-N YM S matrix is compatible with the universally believed UV finiteness of closed-string diagrams, but open/closed duality turns out to be incompatible with the UV divergence of glueball amplitudes with the insertion of meson loops in large-$N$ QCD. Naively, the inconsistency arises in the would-be canonical string solution because such UV-divergent open-string loop amplitudes are dual to tree closed-string diagrams which are universally believed to be both UV finite -- since they are closed-string tree diagrams -- and infrared finite because of the glueball mass gap. In fact, the aforementioned incompatibility follows from a low-energy theorem of the Novikov-Shifman-Vainshtein-Zakharov type derived in Phys. Rev. D 95, 054010 that controls the renormalization in QCD-like theories both perturbatively and nonperturbatively in the large-N expansion. The incompatibility extends to the large-N 't Hooft expansion of a vast class of confining asymptotically free QCD-like theories including $\mathcal{N}=1$ SUSY QCD. We suggest a noncanonical way-out for QCD-like theories based on topological strings on noncommutative twistor space.
Speaker: Marco Bochicchio (INFN - National Institute for Nuclear Physics) -
10:40
Predictions for production and decay of the pseudoscalar glueball from the Witten-Sakai-Sugimoto model 20m
The top-down holographic Witten-Sakai-Sugimoto model for low-energy QCD, augmented by finite quark masses, has recently been found to be able to reproduce the decay pattern of the scalar glueball candidate f0(1710) on a quantitative level. We show that this model predicts a narrow pseudoscalar glueball heavier than the scalar glueball and with a very restricted decay pattern involving eta or eta' mesons. Production should be either in pairs or in association with eta(') mesons. We discuss the prospect of discovery in high-energy hadron collider experiments through central exclusive production by comparing with eta' pair production.
Speaker: Prof. Anton Rebhan (Vienna University of Technology) -
11:00
Coffee break 30m
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Radiation enhancement and ``temperature'' in the collapse regime of gravitational scattering 20m
We generalize the semiclassical treatment of graviton radiation to
gravitational scattering at very large energies $\sqrt{s}\gg m_P$ and finite
scattering angles $\Theta_s$, so as to approach the collapse regime of impact
parameters $b \simeq b_c \sim R\equiv 2G\sqrt{s}$. Our basic tool is the
extension of the recently proposed, unified form of radiation to the string-based ACV
reduced-action model and to its resummed-eikonal exchange. By superimposing
that radiation all-over eikonal scattering, we are able to derive the
corresponding (unitary) coherent-state operator. The resulting graviton
spectrum, tuned on the gravitational radius $R$, fully agrees with previous
calculations for small angles $\Theta_s\ll 1$ but, for sizeable angles
$\Theta_s(b)\leq \Theta_c = O(1)$ acquires an exponential cutoff of the
large $\omega R$ region, due to energy conservation, so as to emit a finite
fraction of the total energy. In the approach-to-collapse regime of
$b\to b_c^+$ we find a radiation enhancement due to large tidal forces, so
that the whole energy is radiated off, with a large multiplicity
$\langle N \rangle \sim Gs \gg 1$ and a well-defined frequency cutoff of order $R^{-1}$.
The latter corresponds to the Hawking temperature for a black hole of mass
notably smaller than $\sqrt{s}$.
I shall also show preliminary results for collisions below the critical impact parameter ($b < b_c$) where a classical collapse is expected, but a quantum-mechanical mechanism can avoid or reduce information loss.Speaker: Dimitri Colferai -
11:50
$\cN =2^*$ (non-)Abelian theory in the $\Omega$-background from String theory 20m
We present a D-brane realisation of the (non-)Abelian $\mathscr{N}=2^*$ theory. For $\Omega$ deformation we compute suitable topological amplitudes in this setup. These amplitudes are expressed as a double series expansion. The coefficients determine couplings of higher-dimensional operators in the effective supergravity action that involve powers of the anti-self-dual $\mathscr{N}=2$ chiral Weyl superfield and of self-dual gauge field strengths superpartners of the D5-brane coupling modulus. In the field theory limit, as it is expected, the result reproduces the Nekrasov partition function in the two-parameter $\Omega$-background.
Speaker: Dr Marine Samsonyan (CERN) -
12:10
Non-Linear Invariance of Black Hole Entropy 20m
A novel non-linear symmetry of black hole entropy is presented : Freudenthal duality, defined as an anti-involutive, non-linear map acting on symplectic spaces.
After a general introduction on some aspects of extended (super)gravity theories in four dimensions and the structure of their e.m. duality orbits, I will consider the e.m. duality Lie groups "of type E7", and the corresponding notion of Freudenthal duality.
Extension to Abelian gaugings of supergravity, also including hypermultiplets, will also be briefly discussed.Speaker: Dr Alessio Marrani ("Enrico Fermi" Center, Roma, IT) -
12:30
Yukawas of light stringy states 20m
We investigate light massive string states that appear at brane
intersections. They replicate the massless spectrum in a richer
fashion and may be parametrically lighter than standard Regge
excitations. We compute tri-linear Yukawa couplings of such
open-string states to massless ones and to one another. Due to
ambiguities in the normalisation of the vertex operators, that involve
twist fields, we proceed via factorization of appropriate scattering
amplitudes. Some peculiar features are observed that may lead to
interesting signatures at colliders in the future.Speaker: Pascal Anastasopoulos (Unknown)
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Top and electroweak Room Volpi (Palazzo del Casinò)
Room Volpi
Palazzo del Casinò
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09:00
Measurements of ttbar+X using the ATLAS detector 15m
The large centre-of-mass energy available at the proton-proton collider LHC allows for the copious production of top quark pairs in association with other final state particles at high transverse momenta. The ATLAS experiment has measured several final state observables that are sensitive to additional radiation in top anti-top quark final states. Results on the top production in association with W and Z bosons are presented as well as top pair production with a photon or with b quarks. Analyses probing the top pair production with additional QCD radiation include the multiplicity of jets for various transverse momentum thresholds in the 13 TeV data. These measurements are compared to modern Monte Carlo generators based on NLO QCD matrix element or LO multi-leg matrix elements.
Speaker: Kentaro Kawade (Kobe University (JP)) -
09:15
Measurements of the associated production of top quark pairs with bosons or other top quarks 15m
A comprehensive set of measurements of top quark pair production in association with EWK bosons (W, Z or ɣ) is presented at different centre-of-mass energies. The results are compared to the theory predictions and re-interpreted as searches for new physics inducing deviations from the standard model predictions using an effective field theory approach. The status of the search for double-ttbar pair production combining different final states is also reported.
Speaker: Javier Cuevas Maestro (Universidad de Oviedo) -
09:30
Soft gluon resummation for the associated production of a top quark pair with a W or Z boson at the LHC 15m
The measurements of associated production of a massive gauge boson with
a top-antitop quark pair at the LHC provide an important test of the
Standard Model, in particular of the top quark couplings.
To increase the precision of the theoretical predictions beyond NLO, a class of
logarithmic corrections can be taken into account with the help of
resummation methods.
In this talk results for soft gluon resummation at fixed
invariant mass for $pp \rightarrow t \bar t Z / W$ will be presented.
The resummed
results are matched
to the NLO predictions and include terms beyond next-to-leading
logarithmic accuracy.
Numerical predictions for the total inclusive cross sections and the invariant
mass distributions at the LHC will be discussed, together with
estimates of their theoretical errors .Speaker: Daniel Schwartländer (University of Münster) -
09:45
Top quark event modelling and generators in CMS 15m
State-of-the-art theoretical predictions accurate to next-to-leading order QCD interfaced with Pythia8 and Herwig++ event generators are tested by comparing the unfolded ttbar differential data collected with the CMS detector at 8 and 13 TeV. These predictions are also compared with the underlying event activity distributions in ttbar events using CMS proton-proton data collected at a center of mass energy of 13 TeV.
Speaker: Efe Yazgan (Chinese Academy of Sciences (CN)) -
10:00
Tagging and calibration of large radius jets from boosted top quarks, W, Z and Higgs bosons in ATLAS 15m
In order to fully exploit the abundance of hadronically decaying high momentum top quarks, and W, Z or Higgs bosons produced at LHC, jet substucture has become crucial to a wide array of searches and measurements. The latest ATLAS results in terms of optimisation and performance of large radius jets taggers are presented. The calibration of large radius jets energy and mass and their systematic uncertainties are also presented.
Speakers: Christophe Clement (Stockholm University (SE)), Christophe Clement (Stockholm University) -
10:15
Study of the Lorentz structure of $\tau$ decays from Belle 15m
We evaluate the Michel parameters of $\tau$ decays using the full data
sample of Belle. This is important to reveal the Lorentz structure of
$\tau$ leptonic decays, which includes not only the V − A interaction but
also contributions from scalar, tensor and others that may arise from
New Physics, thus testing lepton universality as well. We use both
$\tau^+ \to l^+ \nu \bar{\nu}$ and $\tau^+ \to l^+ \gamma \nu \bar{\nu}$. We also measure branching fractions of $\tau$ decays into
three charged leptons and two neutrinos. From this, we can constrain
Michelle-like parameters.Speaker: Kiyoshi Hayasaka -
10:30
Measurement of $e^+e^-$ to hadrons cross sections with BABAR and implications for the muon g-2 15m
The BABAR Collaboration has an intensive program studying hadronic cross sections in low-energy $e^+e^-$ annihilations, which are accessible with data taken near the $\Upsilon$(4S) via initial-state radiation.
Our measurements allow significant improvements in the precision of the
predicted value of the muon anomalous magnetic moment. These improvements are necessary for shedding light on the current ~3 sigma difference between the predicted and the experimental values. We have previously published results on a number of processes with two to six hadrons in the final state.
Currently, the largest uncertainty on the calculation of the hadronic contribution in the energy region between 1 and 2 GeV stems from the
$e^+e^- \to \pi^+\pi^-\pi^0\pi^0$ cross section.
A new precise measurement of this process is presented here, together with measurement of other low-multiplicity channels, such as $e^+e^- \to \pi^+\pi^-\eta$.We also present the first measurements of the $e^+e^- \to K_SK_L\pi^0$, $K_SK_L\eta$ and $K_SK_L\pi^0\pi^0$ cross sections, and the study of their intermediate resonance structure, using 469/fb of data collected with the BaBar detector at SLAC. Initial-state radiation events are also used to study the processes $e^+e^- \to K_SK^+\pi^-\pi^0$ and $K_SK^+\pi^-\eta$, and their intermediate states.
Speaker: Evgeny Solodov (BudkerINP) -
10:45
Prospects for standard model measurements at the High-Luminosity LHC with CMS 15m
The proposed upgrade of the LHC, the High-Luminosity LHC (HL-LHC) is expected to deliver data corresponding to a luminosity of up to 3 ab-1 under severe pileup conditions with up to 200 additional interactions per bunch crossing. The pileup effects are expected to be mitigated by upgraded detectors, which allow to study rare physics processes up to large rapidities, as well as precision standard model measurements that benefit significantly from the high luminosity. Studies are presented that show the potential of the upgraded CMS detector at the HL-LHC with respect to B physics, top-quark production, decay and properties, as well as with respect to the measurement of electroweak processes.
Speaker: Ferdos Rezaei Hosseinabadi (Institute for Research in Fundamental Sciences (IR)) -
11:00
Coffee break 30m
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11:30
Review of top and EW physics at future colliders 30m
In the next decades the Large Hadron Collider and its luminosity upgrade
are expected to yield a wealth of increasingly sensitive searches and
measurements in hadro-production of top quarks and electro-weak gauge
bosons. Several projects are being prepared for energy-frontier lepton
(ILC, CLIC, FCCee, CEPC, mC), electron-proton (LHeC), hadron colliders
(FCChh, SPPC) that are to continue this quest. In this review I collect
the results of a large number of studies into the top and EW physics
potential of the HL-LHC and future colliders. A model-independent
comparison of the BSM potential is performed in the framework of an
effective field theory. I discuss the strengths and weaknesses of lepton
and hadron colliders and identify areas where different projects can
provide complementary information.Speaker: Marcel Vos (IFIC Valencia (ES)) -
12:00
Toward Precision Top Quark Measurements in e+e- collisions 15m
This talk presents a review of precision top quark measurements at
linear e+e- colliders, with results from the ILC detector concepts and
the CLIC detector and physics group. After a brief overview of
established elements of the top physics programme, the contribution
focuses on new developments in the full-simulation studies of key
measurements. These include improvements in the experimental
strategies for top quark pair production in the continuum, both at
380-500 GeV and at high energy where top quarks are highly boosted.
New results are presented on the potential of a linear collider to
measure the top electro-weak couplings, where the precision on the
CP-violating dipole moment has been evaluated in full simulation for
the first time. The study into the potential of the top quark mass
measurement at threshold is updated, including a thorough evaluation
of theoretical uncertainties. New results on the reach of searches for
rare flavour-changing neutral current decays are presented as well.Speakers: Naomi Van Der Kolk (Max-Planck-Institut fur Physik (DE)), Naomi Van Der Kolk (NIKHEF (NL)), Naomi van der Kolk (LAL/LLR/CNRS/P2IO) -
12:15
Top quark and electroweak physics at the FCC-hh 15m
The future circular hadron-hadron collider FCC-hh is expected to produce collisions at the unrivaled center of mass energy of sqrt(s) = 100 TeV and to deliver an integrated luminosity of few tens of ab-1. As a result, trillions of top quarks and electroweak gauge bosons will be produced. Having at disposal such humongous samples opens a wide range of possibilities in the realm of electroweak and standard model precision measurements. Final states involving top quarks and heavy gauge bosons can for instance be studied in highly boosted kinematical regimes where the electroweak symmetry is effectively restored. In addition, in such regimes, otherwise non-accessible high dimension operators can be strongly constrained since their contribution can receive substantial enhancements. Large statistics offer the possibility of studying very rare decays, including those that are sensitive to CP-violation. Finally, percent level precision on the top Yukawa coupling can be reached at the FCC-hh.
Speaker: Michele Selvaggi (CERN) -
12:30
Top and EW physics at the LHeC and the FCC-eh 15m
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide electron-proton collisions with center-of-mass energies in the range 1.3-3.5 TeV and instantaneous luminosities larger than $10^{34}$ cm$^{-2}$s$^{-1}$. The talk presents an overview on novel and unique top physics through single and pair production in ep collisions, including prospects for measurements of top quantum numbers, anomalous and CKM couplings, as well as prospects to measure the parton momentum fraction carried by the top when the proton is probed at very high momenta. We also show results on top+Higgs production. Finally, new results on the determination of EW parameters through a combined NC+CC fit of inclusive DIS data are presented.
Speaker: Christian Schwanenberger (Deutsches Elektronen-Synchrotron (DE)) -
12:45
Electroweak Physics at the FCC-ee 15m
The Future Circular Collider with electron-positron beams (FCC-ee) should provide improvements of the electroweak precision measurement concerning Z, W, H and their masses by a large factor over the present status.
The unparalleled experimental precision would open, via Electroweak loop corrections, a broad discovery potential for new, at least weakly interacting particles up to high energy scales.
The Z boson mass and width, as well as the Z → bb partial width, and the forward-backward asymmetries for leptons and quarks can be measured with high precision with the run at the Z pole, where the instantaneous luminosity is expected to be five to six orders of magnitude larger than LEP. As a result, a precise determination of the effective weak mixing angle, as well as of the running electromagnetic coupling αQED(mZ2) can be extracted directly from the data.
At centre-of-mass energies around 160 GeV, corresponding to the WW production threshold, the W boson mass and width can be determined precisely with high-statistics cross section measurements at several energy points. The key breakthrough for this exceptional performance is the continuous beam energy determination by resonant depolarization of the beams. Considerable improvements of the strong coupling constant determination down to a precision of Δαs(mZ)≃±0.0001 will be possible with the measurements of the hadronic widths of the Z and W bosons.Speakers: Elizabeth Locci (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)), Dr E. Locci
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Coffee break 30m
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Neutrino physics Room Casinò (Palazzo del Casinò)
Room Casinò
Palazzo del Casinò
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11:30
Higgs effective $\boldsymbol{H\ell_i\ell_j}$ vertex from heavy $\boldsymbol{\nu_R}$ and applications to LFV phenomenology 15m
We present a new computation of the Higgs effective vertex $H\ell_i\ell_j$ generated from heavy right handed neutrinos, within the Mass Insertion Approximation and to one-loop level. The simple analytical results found have interesting applications to phenomenology of Lepton Flavour Violation. In particular, we discuss some of these implications for Higgs mediated LFV processes.
Speaker: Prof. Maria Jose Herrero (IFT-UAM) -
11:45
Impact of heavy sterile neutrinos on the triple Higgs coupling 15m
The discovery of neutrino oscillations calls for an extension of the Standard Model that would generate neutrino masses and mixing. One of the simplest possibilities is the addition of fermionic gauge singlets or sterile neutrinos. TeV-scale realisations of this idea lead to a very rich phenomenology due to the mixing of the new fermions with the left-handed neutrinos of the SM and the large Higgs-neutrino coupling. In a first study, we showed in a simplified 3+1 model with Dirac neutrinos that loops with a heavy neutrino can induce large corrections, up to 30% of the SM one-loop value. These effects are potentially larger in low-scale seesaw models, as we showed by considering the inverse seesaw. I will discuss how fermionic singlets induce large corrections to the triple Higgs coupling and how they can be used to probe neutrino mass models in a regime otherwise difficult to access.
Speaker: Dr Cedric Weiland (IPPP Durham) -
12:00
Matching and options in Neutrino EFT 15m
We discuss the matching of the minimal seesaw scenario up to dimension
seven onto the SMEFT at tree level, and at one loop to dimension four following the papers arXiv:1703.10924 and arXiv:1703.04415. The dramatic possibility that the minimal seesaw scenario can form a UV boundary condition that give the Higgs potential and electroweak scale at lower energies with PeV Majorana masses is discussed.Speaker: Ilaria Brivio (University of Copenhagen) -
12:15
Quasi-sterile neutrinos at long-baseline oscillation experiments 15m
Sterile neutrinos may be part of a quasi-hidden sector that interacts with Standard Model particles via a heavy mediator. In the case where two (or more) sterile neutrinos have a flavor-changing coupling to a new boson which also couples to nucleons, the heavier state $N_2$ may decay into the lighter state $N_1$ and a pair of Standard Model particles. If the mass difference between the sterile neutrinos is large enough, the $N_2 \to N_1 \pi^+ \pi^-$ process can lead to striking signatures at neutrino detectors. In particular, the light sterile neutrino may be produced through oscillations and then up-scatter creating a pion pair in the detector which is displaced from a DIS event.
Speaker: Dr Bogdan Dobrescu (Fermilab) -
12:30
Effects of RGE on fermion observables in SO10 models 15m
In the context of non-supersymmetric SO(10) models, we analyze the renormalization group equations for the fermions observables (including neutrinos) from the GUT energy scale down to the electroweak energy scale, explicitly taking into account the effects of an intermediate energy scale induced by a Pati--Salam gauge group. We show that the evolved fermion masses and mixing present sizable deviations from the values obtained without including the effects of the intermediate scale.
Speakers: Davide Meloni (University of Roma Tre), Davide Meloni (Universita' di Roma 3) -
12:45
Leptogenesis via varying Weinberg operator 15m
I will talk about a totally new mechanism of leptogenesis. It requires only a time-varying Weinberg operator. The Weinberg operator is well-known for the motivation of generating light neutrino masses. It violates lepton number and can provide non-equilibrium dynamics in the early universe due to the suppression of tiny neutrino masses. A lot of underlying symmetries, e.g., B-L symmetry and flavour symmetries, have been proposed in the lepton sector. These symmetries strong motivate the existence of phase transitions at high scales. During the phase transition, the coupling of the Weinberg operator is time-dependent, and the lepton asymmetry is generated by the interference of the Weinberg operator at different times. Any heave BSM particles, e.g., right-handed neutrinos, are not necessary in this mechanism.
Speaker: Ye-Ling Zhou (Durham University) -
13:00
Neutrino electromagnetic properties: a window to new physics 15m
A review of the theory and phenomenology of neutrino electromagnetic properties is presented. A short discussion on derivation of the general structure of the electromagnetic interactions of Dirac and Majorana neutrinos is presented. Then we review experimental constraints on neutrino magnetic and electric dipole moments, electric millicharge, charge radius and anapole moments from the terrestrial laboratory experiments. A special credit is done to bounds on neutrino magnetic moments obtained by the reactor (MUNU, TEXONO and GEMMA) and solar (Super-Kamiokande and Borexino) experiments.
The effects of neutrino electromagnetic interactions in astrophysical environments are also reviewed. The main manifestation of neutrino electromagnetic interactions, such as: 1) the radiative decay in vacuum, in
matter and in a magnetic field, 2) the Cherenkov radiation, 3) the plasmon decay, 4) spin light in matter, 5) spin and spin-flavour precession, 6) neutrino pair production in a strong magnetic field, and the related processes along with their astrophysical phenomenology are also considered.The best world experimental bounds on neutrino electromagnetic properties are confronted with the predictions of theories beyond the Standard Model. It is shown that studies of neutrino electromagnetic properties provide a powerful tool to probe physics beyond the Standard Model.
References
[1] C. Guinti and A. Studenikin, “Neutrino electromagnetic interactions: a window to new physics”, Rev. Mod. Phys. 87 (2015) 531.
[2] K. Kouzakov, A. Studenikin, Phys. Rev. D 95, (2017) 055013.
[3] A. Studenikin, “New bounds on neutrino electric millicharge from limits on neutrino magnetic moment”, Europhys. Lett. 107 (2014) 21001.
[4] A. Studenikin, I. Tokarev, “Millicharged neutrino with anomalous magnetic moment in rotating magnetized matter”, Nucl. Phys. B 884 (2014) 396.
[5] K.Kouzakov, A.Studenikin, Adv. High Energy Phys. 2014 (2014) 569409 (16 p.).Speaker: Alexander Studenikin
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Lunch break 1h 30m
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ECFA-EPS Special Session: Particle Physics and Society Extending our Vision and Reach Sala Grande (Palazzo del Cinema)
Sala Grande
Palazzo del Cinema
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Medipix: Pixel Detectors for Medical Imaging and Other Applications 30mSpeaker: Michael Campbell (CERN)
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Progress in Application of Hadron Therapy 30mSpeaker: Jacobus Maarten Schippers
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The Challenges of Big Data 30mSpeaker: Ian Bird (CERN)
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Parallel Processing in HEP 30mSpeaker: Graeme Stewart (University of Glasgow (GB))
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Coffee break 30m
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Progress in Muon Tomography 30mSpeaker: Germano Bonomi (Universita di Brescia (IT))
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Impact of Particle Physics on Education 30mSpeaker: Pasquale Di Nezza (INFN e Laboratori Nazionali di Frascati (IT))
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Public Outreach Event with the CERN Director General and the INFN Deputy President (in Italian) 2h Sala Perla (Palazzo del Casinò)
Sala Perla
Palazzo del Casinò
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Plenary session: Mon AM Sala Grande (Palazzo del Cinema)
Sala Grande
Palazzo del Cinema
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Welcome and prize ceremony 1h 30m Sala Grande
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LHC Collider Status 30m Sala Grande
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Speaker: Frederick Bordry (CERN) -
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Coffee break 30m
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Highlights from the ATLAS Experiment 30m Sala Grande
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Palazzo del Cinema
Speaker: Daniel Tovey (University of Sheffield (GB)) -
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Highlights from the CMS Experiment 30m Sala Grande
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Speaker: Dr Juan Alcaraz Maestre (CIEMAT-Madrid) -
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Measurements of the H Scalar Boson 30m Sala Grande
Sala Grande
Palazzo del Cinema
Speaker: Paolo Meridiani (Universita e INFN, Roma I (IT))
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Lunch break 1h 30m
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Plenary session: Mon PM Sala Grande (Palazzo del Cinema)
Sala Grande
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Gravitational Wave observations: status and perspectives 30m Sala Grande
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Speaker: Michele Punturo (INFN Perugia (IT)) -
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Interplay Between the Higgs and Cosmology 30m Sala Grande
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Speaker: Oleg Lebedev (University of Helsinki) -
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Standard Model Measurements (EWK and Top physics) 30m Sala Grande
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Speaker: Marjorie Shapiro (Lawrence Berkeley National Lab. (US)) -
16:00
Coffee break 30m
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The Standard Model Theory 30m Sala Grande
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Speakers: Stefan Dittmaier (MPI fuer Physik), Stefan Dittmaier (Albert-Ludwigs-Universitaet Freiburg (DE)) -
17:00
Top Quark Physics 30m Sala Grande
Sala Grande
Palazzo del Cinema
Speakers: Michal Czakon (University of Wuerzburg), Michal Wiktor Czakon (Rheinisch-Westfaelische Tech. Hoch. (DE)) -
17:30
The Information Paradox: QM and Black Holes 30m Sala Grande
Sala Grande
Palazzo del Cinema
Speaker: Kyriakos Papadodimas (CERN)
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Poster session Palazzo del Casinò
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Classical music concert: VENICE CHAMBER ORCHESTRA 1h Sala Perla (Palazzo del Casinò)
Sala Perla
Palazzo del Casinò
VENICE CHAMBER ORCHESTRA
Music Program
G. Verdi: Overture to Nabucco
V. Bellini: "Casta Diva" from Norma
G. Verdi: "Dei miei bollenti spiriti" from La Traviata
G. Rossini: Ouverture to Il Barbiere di Siviglia
V. Bellini "Ah per sempre io ti perdei" from I Puritani
G. Rossini: "Una voce poco fa" from Il Barbiere di Siviglia
G. Verdi: Preludio to La Traviata
E. Morricone: "Gabriel's oboe" from Mission
G. Puccini: "Nessun dorma" from Turandot
G. Donizetti: "Regnava nel silenzio...Quando rapito in estasi" from Lucia di Lammermoor
E. Morricone: "Love Theme" from Nuovo Cinema Paradiso
G. Verdi: "Bella figlia dell'amore" from Rigoletto
Conductor: Pietro Semenzato
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Plenary session: Tue AM Sala Grande (Palazzo del Cinema)
Sala Grande
Palazzo del Cinema
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Highlights from the LHCb Experiment 30m Sala Grande
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Palazzo del Cinema
Speaker: Ulrik Egede (Imperial College (GB)) -
09:30
Rare Decays and Exotic States in Quark Flavour Physics 30m Sala Grande
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Speaker: Justine Serrano (CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France) -
10:00
CP Violation and CKM Physics 30m Sala Grande
Sala Grande
Palazzo del Cinema
Speaker: Christoph Schwanda (Austrian Academy of Sciences (AT)) -
10:30
Flavour Physics Theory 30m Sala Grande
Sala Grande
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Speakers: Stefania Gori (University of Cincinnati (US)), Stefania Gori (Perimeter Institute/Cincinnati University), Stefania Gori, Stefania Gori (University of Chicago), stefania gori (sns) -
11:00
Coffee break 30m
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Searches for Supersymmetry and Exotica 30m Sala Grande
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Speaker: Monica D'Onofrio (University of Liverpool (GB)) -
12:00
Direct High-energy Cosmic Ray Measurements 30m Sala Grande
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Speaker: Bruna Bertucci (Universita e INFN, Perugia (IT)) -
12:30
High-energy cosmic gamma rays 30m Sala Grande
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Speakers: Werner Hofmann (Max-Planck-Gesellschaft (DE)), Werner Hofmann (Max Planck Institut für Kernphysik)
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Plenary session: Tue PM Sala Grande (Palazzo del Cinema)
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Neutrino Astrophysics 30m Sala Grande
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Speaker: Maarten De Jong (Nikhef National institute for subatomic physics (NL)) -
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Neutrino Physics from Natural and Reactor Beams 30m Sala Grande
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Speakers: Thierry Lasserre, Thierry Lasserre (CEA) -
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Neutrino Physics from Particle Beam and Decay Experiments 30m Sala Grande
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Speaker: Tsuyoshi Nakaya (Kyoto University) -
16:00
Coffee break 30m
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Neutrinos: Theory and Phenomenology 30m Sala Grande
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Speaker: Joachim Kopp (Johannes-Gutenberg-Universitaet Mainz (DE)) -
17:00
Direct Searches for Dark Matter 30m Sala Grande
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Speaker: Manfred Lindner (Max Planck Institut fuer Kernphysik, Heidelberg, Germany) -
17:30
Dark Matter: A Theoretical Overview 30m Sala Grande
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Speaker: Yonit Hochberg (Weizmann Institute of Science) -
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Axions: from QCD to the Dark Universe 30m Sala Grande
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Speaker: Javier Redondo (LMU/MPP Munich)
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Banquet 3h
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Plenary session: Wed AM Sala Grande (Palazzo del Cinema)
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Highlights from the ALICE Experiment 30m Sala Grande
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Speaker: Michele Floris (CERN) -
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Flavour Production and the QGP in Heavy Ion Collisions 30m Sala Grande
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Speaker: Roberta Arnaldi (Universita e INFN Torino (IT)) -
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Jets and Particle Correlations in Heavy Ion Collisions 30m Sala Grande
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Speaker: Matthew Nguyen (Centre National de la Recherche Scientifique (FR)) -
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30 Years of Heavy Ions and Outlook 30m Sala Grande
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Speaker: Johanna Stachel (Ruprecht-Karls-Universitaet Heidelberg (DE)) -
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Coffee break 30m
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Cosmic Microwave Background 30m Sala Grande
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Speaker: François Bouchet (IAP Paris, France) -
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Dark Energy Surveys 30m Sala Grande
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Speaker: Elisabeth Krause (KALVI Inst. SLAC, Stanford) -
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The Cosmological Standard Model 30m Sala Grande
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Speaker: Antonio Walter Riotto (Universite de Geneve (CH))
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Plenary session: Wed PM Sala Grande (Palazzo del Cinema)
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SUSY and BSM Theory After LHC 2016 30m Sala Grande
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Speaker: Nathaniel Craig (UC Santa Barbara) -
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Detector R&D for Collider and Underground Experiments 30m Sala Grande
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Speaker: Philip Patrick Allport (University of Birmingham (UK)) -
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Future Accelerator Machines and R&D 30m Sala Grande
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Speaker: Daniel Schulte (CERN) -
16:00
Coffee break 30m
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Highlights from this EPS-HEP 2017 Conference 30m Sala Grande
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Speaker: Paris Sphicas (CERN/Athens) -
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Outlook 30m Sala Grande
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Speaker: Fabio Zwirner (University and INFN, Padova (IT)) -
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Announcement of EPS-HEP 2019 and Closing 5m Sala Grande
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