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ICHEP 2024
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Prague
Prague
Tomas Davidek
(Charles University (CZ)),
Zdenek Dolezal
(Charles University (CZ))
Description
42nd International Conference on High Energy Physics
ICHEP is a series of international conferences organized by the C11 commission of the International Union of Pure and Applied Physics (IUPAP). It has been held every two years since more than 50 years, and is the reference conference of particle physics where most relevant results are presented.
At ICHEP, physicists from around the world gather to share the latest advancements in particle physics, astrophysics/cosmology, and accelerator science and discuss plans for major future facilities.
Main web-page of the ICHEP 2024 conference: https://ichep2024.org/
Registration is open: https://ichep2024.org/registration-guidelines/
The conference is in-person only. The plenary sessions on July 22-24 will be streamed on Youtube, see link.
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Contact
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3:00 PM
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7:00 PM
Registration Foyer Ground Floor
Foyer Ground Floor
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5:00 PM
Social Program: Vernissage of the exhibition "Particles and Arnošt Lustig" Foyer - Winter Garden
Foyer - Winter Garden
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3:00 PM
Vernissage of the exhibition "Particles and Arnošt Lustig" 2h Foyer - Wiinter Garden
Foyer - Wiinter Garden
Prague Congress Centre
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3:00 PM
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3:00 PM
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7:00 PM
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8:00 AM
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8:30 AM
Registration Foyer Ground Floor
Foyer Ground Floor
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8:30 AM
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10:15 AM
Accelerators: Physics, Performance, and R&D for future facilities Club D
Club D
Convener: Gaku Mitsuka (KEK)-
8:30 AM
Status of the CEPC Project 18m
The discovery of the Higgs boson marked the beginning of a new era in HEP. Precision measurement of the Higgs properties become a natural next step beyond the LHC and HL-LHC. Among the proposed Higgs factories worldwide, the Circular Electron Positron Collider (CEPC) was proposed in 2012. CEPC can produce Higgs/W/Z and top which aims to measure Higgs, EW, flavor physics and QCD with unprecedented precision and to probe new physics beyond SM. With the official release of CEPC Accelerator Technical Design Report (TDR) in December, 2023, we are intensively preparing accelerator Engineering Design Report (EDR) and reference detector TDR. The purpose is to submit CEPC proposal to Chinese government for approval and start construction within the “15th five-year plan (2026-2030)”. In this talk, the overview and global aspects of the CEPC project, highlights of CEPC physics, accelerator and detector R&D will be presented. International participation and contributions are warmly welcome.
Speaker: Haijun Yang (Shanghai Jiao Tong University (CN)) -
8:48 AM
ILC and CLIC Project Status and Plans 18m
The International Linear Collider (ILC) and Compact Linear Collider (CLIC) are well-developed with mature and resource-conscious designs as next-generation high-energy electron-positron colliders. With their key features of polarised beams and extendable energy reach they offer unique possibilities to explore the Higgs boson, the electroweak gauge bosons, the top quark as well as beyond Standard Model sectors. An overview and status of each collider project will be given, including the design, key technologies, accelerator systems, energy-staging strategies, and the most recent cost and power estimates. An overview of the ongoing development strategy for each project over the next 4-5 years will be presented, as well as possible long-term visions for a linear collider facility.
Speaker: Jenny List (Deutsches Elektronen-Synchrotron (DE)) -
9:06 AM
Highlight from SuperKEKB Beam Commissioning after Upgrading during Long Shutdown 18m
The SuperKEKB is a high-luminosity electron-positron collider where a “nanobeam collision scheme” is utilized to achieve an unprecedented high luminosity. Its luminosity performance had gradually improved, achieving a peak luminosity of 4.7e34 cm-2s-1 in June 2022. While making steady progress, it was found that the SuperKEKB encountered some challenges as a luminosity frontier machine such as short beam lifetime, severe beam instabilities including sudden beam loss, and low injection efficiency. To overcome these challenges, we had a long shutdown from July 2022 to January 2024 to perform many upgrades including construction of a non-linear collimation system, modification of injection point, and additional radiation shielding at the interaction region. Commissioning has just resumed in January 2024, and it is expected that many fruitful results will be obtained during this beam operation that will serve as a good reference for future colliders.
Speaker: kyo shibata -
9:24 AM
FCC-ee Collider Design Overview 18m
In response to the directives of the 2020 European Strategy for Particle Physics (ESPP), CERN, in collaboration with international partners, is exploring the feasibility of an energy-frontier, 100 TeV hadron collider, including, as an initial stage, a high-luminosity circular electron-positron collider serving as Higgs and electroweak factory.
This effort builds upon the 2019 conceptual design reports of the Future Circular Collider (FCC) study. Currently, the FCC Feasibility study, spanning over five years, aims at providing conclusive inputs to the next update of the ESPP, with a focus on implementing these accelerators inside a 90.6 km tunnel in the Lake Geneva basin.
The ongoing study aims to validate tunnel construction, refine collider and injector designs, develop organization and funding models, and conduct R&D on critical machine components. This presentation will provide an overview of the study status and the latest advancements on the electron-positron collider FCC-ee.
Speaker: Kevin Andre (CERN) -
9:42 AM
The R&D Roadmap towards ERL-based particle physics colliders 18m
With concerted R&D efforts under way, the Energy Recovery Linac (ERL) technique is an outstanding novel means to considerably improve the performance of particle physics colliders, providing excellent physics opportunities with significantly reduced power as is required for a next generation of sustainable machines. The European R&D Roadmap for ERL, endorsed by CERN Council, identifies the most crucial and impactful R&D actions to build confidence in the technical feasibility of high-power ERL accelerating systems. The presentation will provide an overview on the implementation status of this roadmap and evaluate the feasibility and potential performance of a portfolio of electron beam based future ERL accelerators under study, especially high-luminosity electron-proton and electron-positron colliders, which at high and at maximum considered beam energy will be suitable to thoroughly investigate the Higgs mechanism in single but as well double-Higgs boson production, resp.
Speaker: Jorgen D'Hondt (Vrije Universiteit Brussel (BE)) -
10:00 AM
PERLE and bERLinPro, two key accelerator projects as pathfinders for future ERL based HEP colliders 15m
The development of Energy Recovery Linacs (ERL) has been recognized as one of the five main pillars of accelerator R&D in support of the European Strategy for Particle Physics. Two projects for high power ERLs, PERLE and bERLinPro are considered key infrastructures for the development of ERLs for future HEP colliders, like e.g. LHeC or FCC-eh. Whereas bERLinPro will be demonstrating high intensity beam creation and recovery in a single turn ERL, PERLE focusses on demanding multi-turn ERL technology as a necessary demonstrator for the future HEP machines, with which is shares the same tech choices and beam parameters. Both facilities, PERLE and bERLinPro recently joint forces to collaborate on improving the efficiency of ERLs in the context of beam operation, but also power consumption in the EU Horizon iSAS framework. Here we will report on the projects status, introduce the main ongoing achievements and describe the staged strategy for construction and on-going commissioning.
Speaker: Walid KAABI
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8:30 AM
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10:15 AM
Astro-particle Physics and Cosmology South Hall 2B
South Hall 2B
Convener: Adriano Di Giovanni (Gran Sasso Science Institute (IT))-
8:30 AM
Light signal study of cosmic rays in the ICARUS detector 20m
The ICARUS LArTPC, currently placed at Fermilab, is collecting data exposed to Booster Neutrino and Numi off-axis beams within the SBN program. A light detection system, based on PMTs deployed behind the TPC wire chambers, is in place to detect vacuum ultraviolet photons produced by ionizing particles in LAr. This system is fundamental for the detector operation, providing an efficient trigger and contributing to the 3D reconstruction of events. Moreover, since the TPC is exposed to a huge flux of cosmic rays due to its operations at shallow depths, the light detection system allows for the time reconstruction of events, contributing to the identification and to the selection of neutrino interactions within the beam spill gates.
This contribution will primarily focus on the comparative study (data vs. MC) of light signal of cosmic muons to validate the light emulation. An overview of the current analysis status and its first results will be reported.Speaker: Magda Cicerchia (Universita e INFN, Padova (IT)) -
8:50 AM
Pacific Ocean Neutrino Experiment: Towards the first detector lines 15m
The Pacific Ocean Neutrino Experiment (P-ONE) is a planned cubic-kilometer deep-sea detector targeting the study of high-energy neutrinos, their sources, and their unknown acceleration mechanisms. With low expected scattering in the deep sea, the ocean is an ideal location for high-energy neutrino detectors with the potential for sub-degree angular resolution. However, operating large-scale infrastructure in deep waters carries various challenges. With ever-changing ocean currents, detection lines will sway through the water column, effectively resulting in time-variable detector geometry, water properties, and optical backgrounds. Together with Ocean Networks Canada, P-ONE aims to install long-lived sub-sea photosensor and calibration instrumentation, to enable continuous and precise neutrino detection. In this talk, we will present the ongoing development of the first P-ONE detector line, its instrumentation, and the expected performance of the first cluster of P-ONE lines.
Speaker: Felix Henningsen (Simon Fraser University) -
9:05 AM
The Radio Neutrino Observatory in Greenland: Status and Perspectives 15m
High-energy neutrinos propagating over cosmological distances are the ideal messenger particles for astrophysical phenomena, but the neutrino landscape above 10 PeV is currently completely uncharted. At these extreme energies and the frugal flux expected, the dominant experimental strategy is to detect radiofrequency emissions from particle cascades produced by neutrinos interacting in the vast polar ice sheets.
The Radio Neutrino Observatory in Greenland (RNO-G) is an array of radio antennas embedded in the ice near Summit Station, currently being deployed. At completion, RNO-G will consist of 35 autonomous antenna stations interspaced by 1.25 km on a rectangular grid, making it the largest and most sensitive in-ice neutrino telescope with unique access to the northern sky.
In this talk, I will describe the design of RNO-G, outline calibration and analysis strategies developed on the way to first physics, and share a look at the data collected by the first seven operating stations.
Speaker: Philipp Windischhofer (University of Chicago (US)) -
9:20 AM
Development and Design of New Detector of Unusual Cosmic-ray casKades 15m
A large mystery that is currently being investigated by the High Energy Physics (HEP) field is the origin and the nature of the Ultra-high energy Cosmic Rays (UHECR). Coming from deep within the Universe, they bring information from afar as well as on possible new physics. This talk reports on the development and design of DUCK (Detector system of Unusual Cosmic-ray casKades), a new cosmic-rays detector at the Clayton State University campus with ns-level detection resolution. The main scientific importance for the DUCK project will be to contribute to the general EAS event analysis methodology novel approach using the full waveform and detector response width, and to an independent verification of the detection of the ‘unusual’ cosmic ray events by the Horizon-T detector system that may be indicating direction towards the novel physics possibilities.
Speaker: Dmitriy Beznosko (Clayton State University) -
9:35 AM
Towards detection of ultra high energy neutrinos at the South Pole: Askaryan Radio Array experiment latest results and future prospects” 15m
The Askaryan Radio Array (ARA) is an in-ice ultrahigh energy (UHE, >10 PeV) neutrino experiment at the South Pole that aims to detect radio emissions from neutrino-induced particle cascades. ARA has five independent stations which together have collected nearly 30 station-years of livetime of data. Each of these stations searches for UHE neutrinos by burying in-ice clusters of antennas ∼200 meters deep in a roughly cubical lattice with side length ~20m. Additionally, the fifth ARA station (A5) has a beamforming trigger, referred to as the Phased Array, consisting of a trigger array of 7 tightly packed vertically-polarized antennas. In this proceeding, we review the physics results from ARA, report on the progress on the analysis of the full ARA data set, and discuss future prospects for ARA emphasizing the discovery potential and benefits for the radio community and future UHE energy detection experiments.
Speaker: Ilya Kravchenko (University of Nebraska Lincoln (US)) -
9:50 AM
Thermal effects in neutrino dark matter freeze-in production 15m
We present a detailed study of the production of dark matter in the form of a sterile neutrino via freeze-in from decays of heavy right-handed neutrinos. Our treatment accounts for thermal effects in the effective couplings, generated via neutrino mixing, of the new heavy neutrinos with the Standard Model gauge and Higgs bosons and can be applied to several low-energy fermion seesaw scenarios featuring heavy neutrinos in thermal equilibrium with the primordial plasma. We find that the production of dark matter is not as suppressed as to what is found when considering only Standard Model gauge interactions. Our study shows that the freeze-in dark matter production could be efficient.
Speaker: Salvador ROSAURO-ALCARAZ
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8:30 AM
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10:15 AM
Beyond the Standard Model: Block 1 South Hall 1A
South Hall 1A
Conveners: Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE)), Michal Malinsky (Charles University (CZ))-
8:30 AM
Searches for physics beyond the Standard Model at the Short-Baseline Near Detector 17m
The Short-Baseline Near Detector (SBND) is a 112-ton liquid argon time projection chamber 110 m away from the Booster Neutrino Beam (BNB) target at Fermilab (Illinois, USA). In addition to its role as a near detector enabling precision searches for short-baseline neutrino oscillations, the proximity of SBND to the BNB target makes the experiment ideal for many beyond the Standard Model (BSM) searches of new particles produced in the beam. The nanosecond-timing resolution of the scintillation light detectors further boosts the experiment capabilities. In this talk, we present the status and expected sensitivity to new BSM particles such as heavy neutral leptons using a full beamline and detector simulations, as well as with a model-independent approach.
Speaker: Jiaoyang Li (The University of Edinburgh) -
8:47 AM
MicroBooNE’s Beyond Standard Model Physics Program 17m
The MicroBooNE detector, an 85-tonne active mass liquid argon time projection chamber (LArTPC) at Fermilab, is ideally suited to search for physics beyond the standard model due to its excellent calorimetric, spatial, and energy resolution. We will present several recent results using data recorded with Fermilab’s two neutrino beams: a first search for dark-trident scattering in a neutrino beam, world-leading limits on heavy neutral lepton production, including the first limits in neutrino-neutral pion final states, and new constraints on Higgs portal scalar models. We also use off-beam data to develop tools for a neutron-antineutron oscillation search in preparation for the DUNE experiment. The talk will also discuss the opportunities for future searches using MicroBooNE data.
Speaker: Dr Anyssa Navrer-Agasson (University of Manchester) -
9:04 AM
The BDF/SHiP experiment at the ECN3 high-intensity beam facility at the CERN SPS 17m
The BDF/SHiP experiment is a general purpose intensity-frontier experiment for the search of feebly interacting GeV-scale particles and to perform neutrino physics measurements at the HI-ECN3 (high-intensity) beam facility at the CERN SPS, operated in beam-dump mode, taking full advantage of the available 4x$10^{19}$ protons per year at 400 GeV. The CERN Research Board recently decided in favour of BDF/SHiP for the future programme of this facility.
The setup consists of two complementary detector systems downstream an active muon shield. The forrmer, the scattering and neutrino detector (SND), consists of a light dark matter (LDM) / neutrino target with vertexing capability. The latter, the hidden sector decay spectrometer (HSDS), consists of a 50 m long decay volume followed by a spectrometer, timing detector, and a PID system. BDF/SHiP offers an unprecedented sensitivity to decay and scattering signatures of various new physics models and tau neutrino physics.Speaker: Andrei Golutvin (Imperial College London) -
9:21 AM
Neutrino masses from new Weinberg-like operators 17m
The unique dimension-5 effective operator, LLHH, known as the Weinberg operator, generates tiny Majorana masses for neutrinos after electroweak spontaneous symmetry breaking. If there are new scalar multiplets that take vacuum expectation values (VEVs), they should not be far from the electroweak scale. Consequently, they may generate new dimension-5 Weinberg-like operators which in turn also contribute to Majorana neutrino masses. In this study, we consider scenarios with one or two new scalars up to quintuplet SU(2) representations. We analyse the scalar potentials, studying whether the new VEVs can be induced and therefore are naturally suppressed, as well as the potential existence of pseudo-Nambu-Goldstone bosons. Additionally, we also obtain general limits on the new scalar multiplets from direct searches at colliders, loop corrections to electroweak precision tests and the W-boson mass.
Speaker: Drona Vatsyayan -
9:38 AM
Neutrino masses and $0\nu\beta\beta$ decays in leptoquark models 17m
We explore the potential of neutrinoless double-beta ($0\nu\beta\beta$) decays to probe scalar leptoquark models that dynamically generate Majorana masses at the one-loop level. By relying on Effective Field Theories, we perform a detailed study of the correlation between neutrino masses and the $0\nu\beta\beta$ half-life in these models. We describe the additional tree-level leptoquark contributions to the $0\nu\beta\beta$ amplitude with higher-dimensional operators, which can overcome the ones from the standard dimension-five Weinberg operator for leptoquark masses as large as $\mathcal{O}(10^3~\mathrm{TeV})$. In particular, we highlight a possibly ambiguity in the determination of neutrino mass ordering by only using $0\nu\beta\beta$ decays in this type of models. The interplay between $0\nu\beta\beta$ with other flavor measurements is also explored and we discuss the importance of properly accounting for the neutrino and charged-lepton mixing matrices in our predictions.
Speaker: Luighi Pierre Santos Leal (University of São Paulo, IFUSP / Université Paris-Saclay, IJCLab)
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8:30 AM
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8:30 AM
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10:15 AM
Dark Matter Club A
Club A
Conveners: Dr Martin Stahlberg (Max Planck Institute for Physics), Christian Ohm (KTH Royal Institute of Technology (SE))-
8:30 AM
The ALPHA axion dark matter experiment 17m
The axion represents a well-motivated dark matter candidate with a relatively unexplored range of viable masses. Recent calculations argue for post-inflation axion mass ranges corresponding to frequencies of roughly 10-100 GHz. These frequency ranges offer challenges for the traditional cavity halscope which can be overcome through the use of metamaterial resonators that fill large volumes. The ALPHA (Axion Longitudinal Plasma HAloscope) experiment, located at Yale University, is an axion dark matter detector probing the 10-45 GHz frequency range. Axions can convert into photons in the tunable and cryogenically-cooled resonator within the 16-T magnet of the experiment, and be detected with the quantum-limited amplification and readout. In this talk, we will describe the general design parameters of the experiment and the expected sensitivity.
Speaker: Dr Jon E. Gudmundsson (Stockholm University) -
8:47 AM
The axion dark matter experiment MADMAX 17m
The MAgnetized Disk and Mirror Axion eXperiment is a future experiment aiming to detect dark matter axions from the galactic halo by resonant conversion to photons in a strong magnetic field. It uses a stack of dielectric disks, called booster, to enhance the axion-photon conversion probability over a significant mass range. Several smaller scale prototype systems have been developed and used to verify the experimental principles. This talk will present the current status of the experiment and its prototypes, including the ongoing research and development and remaining challenges.
Speaker: Pascal Pralavorio (CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR)) -
9:04 AM
Full Results from HAYSTAC’s Phase II Operation with a Squeezed-State Receiver 17m
The Haloscope At Yale Sensitive To Axion CDM (HAYSTAC) experiment is a microwave cavity used to search for cold dark matter (CDM) axions with masses above 10 $\mu$eV. HAYSTAC searches for axion conversion into a resonant photon signal in an 8 T magnetic field, due to the Primakoff effect. In typical cavity experiments, the output signal power is exceedingly small, and thus quantum amplifiers are required. As a result, quantum uncertainty manifests as a fundamental noise source, limiting the measurement of the quadrature observables. Data taking for HAYSTAC was divided into two parts: Phase I achieved a near quantum-limited sensitivity using a single Josephson parametric amplifier (JPA), and covered a range between 23.15 < $m_a$ < 24.0 $\mu$eV, while Phase II used vacuum squeezing to circumvent the quantum limit, making HAYSTAC the first axion experiment to surpass it. In this talk, we will present an overview of the HAYSTAC experiment, and discuss the latest results from Phase II.
Speaker: Jonathan Echevers (University of California Berkeley) -
9:21 AM
Dark matter search in DEAP-3600: status and prospects 17m
DEAP-3600, with its 3.3 tonnes liquid argon target, is a dark matter direct detection experiment set at SNOLAB in Sudbury, Canada. Since 2019 the experiment has held the most stringent exclusion limit in argon for Weakly Interacting Massive Particles (WIMPs) above 20 GeV/c^2.
Since the end of the second fill run in 2020 the detector has been upgraded, to reduce the backgrounds coming from shadowed alphas and dust dissolved in the detector in the third fill run, scheduled this year.In parallel with that, the physics reach of the experiment has been widened, with unique contributions to the {39}^Ar activity measurements and ultra-heavy dark matter candidates, while developing a detailed Profile likelihood Ratio WIMP search on the full second run, which will push the experiment down to unprecedented sensitivity.
Speaker: Michela Lai -
9:38 AM
Exploring Low-Mass Dark Matter with the DarkSide Detectors 17m
Dark matter candidates with masses below 10 GeV/c² show considerable potential. Our last-generation detector, DarkSide-50, has achieved world-leading results in this mass range using ionization-only analysis with 46kg of active mass. Building upon the advancements of DarkSide-50 for low-mass dark matter searches, and in line with the ongoing progress towards the next-generation high-mass dark matter detector, DarkSide-20k, a dedicated detector named DarkSide-LowMass has been proposed. DarkSide-LowMass is optimized for low-threshold electron-counting measurements, and sensitivity to light dark matter is explored across various potential energy thresholds and background rates. Our studies indicate that DarkSide-LowMass can achieve sensitivity to light dark matter down to the level of the solar neutrino fog for GeV-scale masses, and significant sensitivity down to 10 MeV/c², considering the Migdal effect or interactions with electrons.
Speaker: Prof. Yi Wang (Institute of High Energy Physics, Chinese Academy of Sciences) -
9:55 AM
Direct Dark Matter Search in the DarkSide-20k Experiment 17m
DarkSide-20k is a direct dark matter search experiment located at Laboratori Nazionali del Gran Sasso (LNGS). It is designed to reach an exposure of 200 tonne-years free from instrumental backgrounds. The core of the detector is a dual-phase Time Projection Chamber (TPC) filled with 50 tonnes of low-radioactivity liquid argon. The TPC is surrounded by a gadolinium-loaded polymethylmethacrylate (Gd-PMMA), which acts as a neutron veto, immersed in an low-radioactivity liquid argon bath enclosed in a stainless steel vessel, placed inside a proto-dune like cryostat. Readout systems consist of large-area Silicon Photomultiplier (SiPM) array detectors DarkSide-20k aims to reach a dark matter- nucleon cross-section sensitivity of $7.4 \times 10^{-48} cm^{2} $ at 90% confidence level for a dark matter mass of 1 TeV/c^{2} in a 200 tonne-year exposure.This talk will give an overview of the status of construction and the physics program of the project.
Speaker: Daria Santone (University of Oxford)
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8:30 AM
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Detectors for Future Facilities, R&D, Novel Techniques Club H
Club H
Conveners: Dr David Attié (CEA/Irfu - Université Paris-Saclay (FR)), Tanaz Mohayai (Indiana University)-
8:30 AM
LiquidO: Neutrino Detection and Imaging in Opaque Media 17m
We shall introduce the novel LiquidO technology, relying for the first time on light detection in “opaque” media. This way, LiquidO enables sub-atomic particle event-wise imaging, so event topology, which, once combined with fast timing, the combined system enables powerful particle-ID even at MeV energies. The development is led by the homonymous international academic collaboration with institutions from over 11 countries. LiquidO appears capable of offering several detection features that might lead to a breakthrough potential in neutrino, rare decay physics and generally high-energy physics. The performance of LiquidO betters with higher energies, starting from a fraction of MeV, if scintillation is used. Its preliminary physics potential will also be highlighted. LiquidO opens a test-bed context for further detection R&D, where further innovation is ongoing, including pioneering new technology elements such as opaque scintillators.
Speaker: Stefan Schoppmann (JGU Mainz) -
8:47 AM
Detecting very low energy electrons with Transition-edge sensor for the Ptolemy project. 17m
Traditionally used for photon detection, superconducting Transition-edge Sensors (TESs) take on a new role in the PTOLEMY project as we investigate their application for electron detection to establish the existence of relic neutrinos. PTOLEMY requires TESs with 50 meV energy resolution for discerning electrons in the tens of eV range. Our focus is on exploring TES detectors' response to low-energy electrons—an unexplored area. For electron generation at low temperatures, we are exploiting both field emission from carbon nanotubes and photoemission from a thin aluminium foil exposed to UV photons. The study provides insights into TES device design and integration with the low-energy cryogenic electron source, marking a significant advancement for PTOLEMY and applications requiring electron detectors capable of discriminating single low-energy electrons with excellent energy resolution and low dark count rates.
Speaker: Francesco Pandolfi (INFN sezione di Roma, Rome, Italy) -
9:04 AM
Calibration of the JUNO Detector 17m
The Jiangmen Underground Neutrino Observatory (JUNO), a 20-kiloton liquid scintillator detector equipped with more than 43 thousand photomultiplier tubes, is under construction currently, aiming primarily to determine the neutrino mass ordering by detecting reactor electron anti-neutrinos. To achieve the physics goal, the detector energy resolution should be better than 3% at 1 MeV and the uncertainty of the absolute energy scale is required to be better than 1%. In order to meet these stringent requirements, a comprehensive calibration system comprising the Automatic Calibration Unit, the Cable Loop System, the Guide Tube Calibration System and the Remotely Operated Vehicle is under development to calibrate the energy nonlinearity and energy non-uniformity of central detector. This talk will present the JUNO calibration system status and analysis strategy, including the calibration subsystems hardware progresses as well as the simulation of the JUNO detector response calibration.
Speaker: Yankai Liu (Xi'an Jiaotong University) -
9:21 AM
GRAIN: a novel liquid argon detector for imaging of neutrino interactions 17m
Charged particles in Liquid Argon (LAr) produce light in the Vacuum Ultraviolet range, challenging traditional optics. Current LAr particle detectors rely on drift electron signals for readout, but this method is not efficient in high event-rate scenarios. New readout methods are needed for scintillation light detection in LAr. The Near Detector complex (ND) of DUNE (Deep Underground Neutrino Experiment) will be installed at Fermilab, with the main goal of monitoring the neutrino beam and probing several neutrino properties. DUNE ND will instrument advanced detectors, including a LAr detector (GRAIN, GRanular Argon for Interactions of Neutrinos) that will perform optical readout of images to identify neutrino interaction vertices and reconstruct particle tracks. This will complement the event reconstruction made by other DUNE subdetectors while also enhancing our understanding of LAr-neutrino interactions. The GRAIN design, goals, and ongoing activities will be described in this talk.
Speaker: Francesca Alemanno (University of Salento and INFN-Lecce) -
9:38 AM
DUNE cold electronics R&D at ICEBERG 17m
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino oscillation experiment with a primary physics goal of observing neutrino and antineutrino oscillation patterns to precisely measure the parameters governing long-baseline neutrino oscillation in a single experiment, and to test the three-flavor paradigm. DUNE is being built with the exquisite imaging capability of massive LArTPC far detector modules and an argon-based near detector. Fermilab and DUNE have built ICEBERG for the R&D of the DUNE Cold Electronics(CE) for both Horizontal and vertical drift TPC including the Photon Detector(PD), DAQ, Trigger, and online and offline software development. ICEBERG has a 1280 channel DUNE APA with 30 cm LAr dual drift volume along with X-ARAPUCA Photon Detector. We are working to implement OnEdge AI/ML in the DUNE-DAQ. The status of R&D will be discussed.
Speaker: Dr Shekhar Mishra -
9:55 AM
A novel highly segmented neutrino detector SuperFGD for the T2K experiment 17m
The T2K neutrino experiment in Japan obtained a first indication of CP violation in neutrino oscillations. To obtain better sensitivity, T2K upgraded the near detector. A novel 3D highly granular scintillator detector called SuperFGD of a mass of about 2 tons will be functioning as a fully-active neutrino target and a 4\pi detector of charged particles from neutrino interactions. It consists of about two millions of small optically-isolated plastic scintillator cubes with a 1 cm side. Each cube is read out in the three orthogonal directions with wave-length shifting fibers coupled to compact photosensors, micro pixel photon counters (MPPCs). SuperFGD was installed into the ND280 magnet and accept the neutrino beam since October 2023. In this talk, the main detector parameters, detection and reconstruction of first neutrino events, and its performance in the neutrino beam will be reported.
Speaker: Thomas Jan Kutter (Louisiana State University (US))
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Education and Outreach Club C
Club C
Conveners: Connie Potter (CERN), David Barney (CERN), Miroslav Myska (Czech Technical University in Prague (CZ))-
8:30 AM
IPPOG and spin-offs from particle physics 15m
The main mission of IPPOG, the International Particle Physics Outreach Group, is to bring the excitement of particle physics to the public and especially to the young generatiοn. In the last years, IPPOG has undertaken to emphasize also the benefits to society from fundamental research. A tangible example is the particle therapy masterclass, an integral part of the masterclasses programme, which introduces high-school students to applications of accelerators in the fight against cancer. Another example is the effort of the working group “Outreach of applications for society”. Its objective is to create a collection of short stories, covering a wide spectrum of spin-offs from our field. The ultimate goal is to connect fundamental research to everyday life and provide a practical communication tool for the science outreach community.
Speaker: Yiota Foka (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) -
8:45 AM
Virtual tours and videogames to showcase the ATLAS experiment 15m
Showcasing the ATLAS detector and its enormous facilities to local audiences often proves difficult as it's difficult to convey the sheer size of the project. In a project together with the National Videogame Museum (NVM) in Sheffield, we have developed a virtual tour through ATLAS and the CERN site. It can be used in a web browser but is also available for use with google cardboard, a cheap but effective VR headset based on mobile phones. The virtual tour has been successfully used in a number of outreach events, and is also integrated into a workshop devised with the NVM that incorporates the physics of video games, particle physics and ask participants to design a CERN-related videogame. This contribution presents the developed tours and their implementation and gives an overview over its current use cases and received feedback.
Speaker: Kristin Lohwasser (University of Sheffield (GB)) -
9:00 AM
Exographer, a videogame based on particle physics 15m
Exographer is a video game based on particle physics, coming out in 2024. It will put our field of research in brand new (gamer) hands. In Exographer, players use gluoboots or a photosphere to overcome obstacles while discovering, one by one, all the particles of the Standard Model. The levels are inspired by real laboratories (giant colliders and detectors, neutrino underground facilities, cosmic ray observatories…). A lost civilization inspired by real physicists such as Pauli or Curie with timeline is transposed from the real discovery history.
It was imagined by Raphael Granier de Cassagnac, a particle physicist and member of the CMS collaboration, who brought together a team of videogame professionals in the research center of Ecole Polytechnique, France.
I will show the main aspects of Exographer, explain how it was conceived, show how it can be used for outreach, and possibly extended to new levels.
Exographer on Steam: https://store.steampowered.com/app/2834320/Exographer/Speaker: Raphael Granier De Cassagnac (Centre National de la Recherche Scientifique (FR)) -
9:15 AM
Leveraging virtual reality for visualising the CMS detector 15m
Virtual reality (VR) is emerging as a transformative tool across various disciplines, revolutionising the way we perceive and interact with objects, data, and their visualisation. In this talk, we present a novel CMS project wherein we use VR, utilising Meta Quest headsets, to create an immersive virtual experience. The virtual world features 3D models of the CMS detector and the underground hallways that lead to the cavern where the detector is located.
The experience is particularly useful for visitors during data taking phase of the LHC when access underground is possible, but entry to the detector cavern is forbidden. The concept is thus that visitors can "see through the walls" to the detector, whilst underground. Through this presentation we will demonstrate our VR project with the help of captured images and videos, and describe general workflows of how it is set up. After the talk, the attendees will also get a chance to experience the project themselves using our VR headsets.
Speaker: Muhammad Ansar Iqbal (University of California Los Angeles (US)) -
9:30 AM
Visiting CMS from your living room (virtually!) 15m
CMS Virtual Visits allow thousands of people each year to experience CMS from the comfort of their own homes or schools. These visits are hosted online where people interact with CMS scientists as they are shown the experimental areas in Cessy, France, often in their own language! Not everybody can visit the site in person, but this should not be a barrier to experiencing everything CMS has to offer and creating excitement for our audiences. Since its inception in 2006, we have created a system for running the virtual visits for many different audiences and languages. We will take you through the history of this initiative, how they are run today, the feedback we have received, and the exciting possibilities this online visit format can have in the coming years for CMS and other outreach teams.
Speaker: Noemi Beni (HUN-REN Institute for Nuclear Research (HU)) -
9:45 AM
Sci-me! - board game and card game from the life of a scientist 15m
In the boardgame Sci-me!, you build up your own scientific laboratory, hire people to do research for you and try to get as many grants as possible to fund your research. Since publications are the scientific currency, your main goal is to publish your scientific findings.
Our game is a concept game designed for educational purposes. All actions in the game and their meta-level meaning are also explained in the interpretation book. In Sci-me we have different complexity modes to catch non-scientists, budding scientists as well as established scientists. The game is available as a digital prototype, a board game and a simplified travel version. Sci-me can also be extended with other add-ons to address specific areas of research or to emphasize different mechanics such as grant applications or open science.Speaker: Michal Jex -
10:00 AM
Open discussion 15m
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8:30 AM
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10:15 AM
Heavy Ions Club B
Club B
Convener: Emilie Maurice (Ecole polytechnique - Centre National de la Recherche Scientifique (FR))-
8:30 AM
Recent highlights on QCD and QED studies with heavy ion collisions at CMS 17m
Heavy ion collisions allow access to novel QCD and QED studies in a laboratory setting. This talk will present recent CMS highlights on precision measurements of the properties of quark-gluon plasma and the strong electromagnetic fields produced in high-energy heavy ion collisions.
Speaker: Christopher Mc Ginn (Massachusetts Inst. of Technology (US)) -
8:47 AM
Recent results from NA61/SHINE strong interaction program 17m
The research conducted by the NA61/SHINE spans a broad spectrum of hadronic physics within the CERN SPS energy range.This presentation will delve into the energy-dependent characteristics derived from the SMES model (the horn and step phenomena), along with the latest findings concerning particle production properties observed in p+p collisions and Be+Be, Ar+Sc, and Xe+La collisions at SPS energies. Furthermore, recent observations by the experiment have unveiled an unexpected surplus of charged meson production compared to neutral mesons in central Ar+Sc collisions. This contribution will provide an analysis of these results. A second pivotal aspect of the physics program is the quest for the critical point of nuclear matter. This presentation will highlight the outcomes of fluctuation, HBT and intermittency analyses, offering insights directly relevant to the search for the critical point. The current achievements and future plans for measuring open charm production will be outlined
Speaker: Seweryn Kowalski (University of Silesia (PL)) -
9:04 AM
Heavy-ion physics at LHCb 17m
The LHCb detector is a unique tool for studying high-energy heavy-ion colli-
sions. Its forward geometry, along with its excellent vertex reconstruction and
particle identification capabilities, allow the LHCb detector to study a wide vari-
ety of observables in pPb and PbPb collisions in previously unexplored kinematic
territory. Recent results from the LHCb heavy-ion program will be discussed,
along with prospects for heavy-ion physics with the newly upgraded LHCb de-
tector.Speaker: Qiuchan Lu (Centre National de la Recherche Scientifique (FR)) -
9:21 AM
SMOG: a high-density gas target experiment at LHCb 17m
Owing to the injection of gas into the LHC beampipe while multi-TeV proton
or ion beams are circulating, the LHCb spectrometer has the unique capabil-
ity to function as the as-of-today highest-energy fixed-target experiment. The
resulting beam-gas collisions cover an unexplored energy range that is above
previous fixed-target experiments, but below RHIC or LHC collider energies.
In this contribution, recent results for hadron production and polarization from
beam-gas fixed-target collisions at LHCb are presented. Also, the upgrade of
the fixed-target system, named SMOG2, and the preliminary results from the
first collected data, will be discussed.Speaker: Chiara Lucarelli (Universita e INFN, Firenze (IT)) -
9:38 AM
Measurement of Bulk Properties with sPHENIX from the 2023 RHIC Run 17m
sPHENIX is a next-generation, state-of-the-art particle detector at the Relativistic Heavy-Ion Collider (RHIC) that has recently taken its first dataset of 200 GeV Au+Au collisions during a commissioning run in 2023. sPHENIX features a variety of subsystem capable of detailed studies of bulk particle production in heavy-ion collisions, including the first barrel hadronic calorimeter at RHIC. This talk presents the first measurements by sPHENIX of bulk QGP properties in the 2023 commissioning data, including the charged particle pseudorapidity density, the total transverse energy, neutral pion production, and azimuthal anisotropies. These measurements are compared to the previous results at RHIC, as well as the latest models of bulk particle production. In addition, we highlight that these first measurements in sPHENIX serve as an important way to benchmark the detector performance and reconstruction for the future measurements that follow.
Speaker: Ron Belmont (University of North Carolina at Greensboro) -
9:55 AM
Charged-particle production in pp collisions at 13.6 TeV and Pb-Pb collisions at 5.36 TeV with ALICE 17m
The pseudorapidity dependence of charged particle production provides information on the partonic structure of the colliding hadrons and is, in particular at LHC energies, sensitive to non-linear QCD evolution in the initial state. For Run3, ALICE has increased its pseudorapidity coverage to track charged particles over a wider range of −3.6 < $\eta$ < 2 combining the measurement from the upgraded Inner Tracking System (ITS) and the newly installed Muon Forward Tracker (MFT).
Particle production mechanisms are explored by addressing the charged-particle pseudorapidity densities measured in pp and Pb−Pb collisions, presenting new final results from Run 3. These studies allow us to investigate the evolution of particle production with energy and system size and to compare models based on various particle-production mechanisms and different initial conditions both at mid and forward rapidities.
Speaker: Abhi Modak (Universita di Brescia (IT))
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8:30 AM
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10:15 AM
Higgs Physics South Hall 2A
South Hall 2A
Conveners: Eleni Vryonidou (University of Manchester (GB)), Michaela Mlynarikova (CERN)-
8:40 AM
Measurements of Higgs boson cross-sections and their interpretation with the ATLAS experiment 17m
The Higgs boson decay to two bosons can be used to perform some of the most precise measurements of the Higgs boson production cross sections. This talk presents the more recent Higgs boson cross section measurements by the ATLAS experiment in the bosonic decay channel. Interpretations of these results in the context of Standard Model effective field theories will be presented. The results are based on pp collision data collected at 13 TeV during Run 2 of the LHC.
Speaker: Xiao Yang (CERN) -
8:57 AM
Higgs boson cross section and coupling measurements at CMS 17m
In this presentation we will discuss the most recent measurements of the couplings of the Higgs boson, as well as its inclusive and fiducial production cross sections, with data collected by the CMS experiment. Data collected at centre of mass energies of 13 and 13.6 TeV are analyzed.
Speaker: Jan Lukas Spaeh (Rheinisch Westfaelische Tech. Hoch. (DE)) -
9:14 AM
Measurements of the Higgs boson mass with the ATLAS detector 17m
This talk presents precise measurement of the Higgs boson mass, obtained using the full dataset collected in pp collisions at 13 TeV during Run 2 of the LHC. The measurements are performed exploiting the Higgs boson decays into two photons or four leptons, as well as their combinations. The talk will describe the adopted analysis strategies, and it will stress the impact of the experimental techniques on these measurements.
Speaker: Rafael Coelho Lopes De Sa (University of Massachusetts (US)) -
9:31 AM
Measurements of the Higgs boson mass and width at CMS 17m
An important aspect of the Higgs boson physics programme at the LHC is to determine all the properties of this particle, including its mass, which is a free parameter in the SM, and its width. This presentation will discuss the latest developments in measurements of the Higgs boson mass and width, with data collected by the CMS experiment at a centre of mass energy of 13 TeV. Both direct and indirect constraints on the Higgs boson width will be shown.
Speaker: Badder Marzocchi (University of Minnesota (US)) -
9:48 AM
NNLO+PS predictions for Higgs production via bottom fusion 17m
MiNNLOPS is a method which uses different jet-multiplicities in order to perform QCD simulations at next-to-next-to-leading order (NNLO) accuracy which are naturally combined with Parton Showers (PS) for a realistic description of LHC events. In this talk I summarise the method and our recent implementation for the Higgs production via bottom annihilation (bbH). Although the bbH signal is extremely challenging at the LHC, it is relevant in BSM theories with an enhanced bottom-Yukawa coupling and in the background studies for Higgs-pair production.
Different schemes can be adopted for the calculation since the bottom quark can be considered both a massless (in the five flavour scheme, 5FS) or a massive quark (with four massless flavours, 4FS). I present our NNLO+PS results in 5FS against fixed order predictions as well as resummed calculations. I also show our recent studies in the 4FS setup in order to capture the massive effects at NNLO+PS accuracy for the first time.Speaker: Christian Biello (Max-Planck Institute for Physics)
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8:40 AM
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10:15 AM
Neutrino Physics: Oscillations Panorama
Panorama
Convener: Viktor Pec (FZU - Institute of Physics of the Czech Academy of Sciences)-
8:30 AM
Latest oscillation results from Daya Bay 15m
The Daya Bay reactor neutrino experiment, pioneering in its measurement of a non-zero value for the neutrino mixing angle $\theta_{13}$ in 2012, operated for about nine years from Nov. 24, 2011 to Dec. 12, 2020. Antineutrinos emanating from six reactors with a thermal power of 2.9 GW$_{\mathrm{th}}$ were detected by eight identically designed detectors, which were positioned in two near and one far underground experimental halls. This spatial configuration, spanning kilometer-scale baselines between detectors and reactors, facilitates a precise examination of the three-neutrino mixing framework. This talk will show the measurements of $\theta_{13}$ and the mass-squared difference by utilizing the Gd-capture tagged sample. Updates on the results derived from the H-capture tagged sample and the search for light sterile neutrinos will also be included.
Speaker: Jinjing Li (Tsinghua University) -
8:45 AM
New results of reactor antineutrino oscillation amplitude and frequency using 3800 days of RENO data 15m
The RENO experiment has precisely measured the amplitude and frequency of reactor antineutrino oscillation at Hanbit Nuclear Power Plant since Aug. 2011. The 2018 publication reported the measured oscillation parameters based on 2200 days of data. Before the RENO far detector was shut down in March 2023, additional 1600 days of data had been acquired. This presentation reports the updated and final result on the reactor antineutrino oscillation amplitude(frequency), with improved statistical and systematic uncertainties by 10%(14%) and 13%(23%), respectively.
Speaker: Sanghoon Jeon (Sungkyunkwan University) -
9:00 AM
Reactor flux and spectrum measurement with the Daya Bay full data set 15m
This talk will present a reactor flux and spectrum measurement with the Daya Bay full data set, 34% increase in statistics compared to the previous results. Using detector data spanning effective $\mathrm{^{239}Pu}$ fission fractions $F_{239}$ from 0.25 to 0.35, Daya Bay measures an average IBD yield and a fuel-dependent variation in IBD yield, $d\sigma_f/dF_{239}$. In addition, the yields and prompt spectra of the two dominant isotopes, $\mathrm{^{235}U}$ and $\mathrm{^{239}Pu}$, are extracted. Using SVD unfolding techniques, the $\bar{\nu}_e$ spectra are estimated from the prompt spectra of $\mathrm{^{235}U}$, $\mathrm{^{239}Pu}$, and the total measurement, thereby providing a model-independent reactor $\bar{\nu}_e$ spectrum prediction for the other reactor antineutrino experiments. Among them, the $\bar{\nu}_e$ spectrum for $\mathrm{^{235}U}$ is one of the most precise measurements, and the $\bar{\nu}_e$ spectra for $\mathrm{^{239}Pu}$ and total are the most precise measurements.
Speaker: Mr Jinhao Huang (Institute of high energy physics) -
9:15 AM
Recent results from the DANSS experiment 15m
New DANSS results on searches for sterile neutrinos based on 8.5M $\nu$ events exclude an important part of the $\nu_s$ parameter space. Obtained limits exclude practically all sterile neutrino parameters preferred by BEST results for $Δm^2$ < 5 $eV^2$. Analysis relying on absolute $\nu$ flux predictions excludes practically all $\nu_s$ parameters preferred by the BEST results. The neutrino spectrum dependence on the $^{239}Pu$ fission fraction agrees with predictions of the Huber-Mueller model. The ratio of cross sections for $^{235}U$ and $^{239}Pu$ also agrees with the Huber-Mueller model and somewhat larger than in other experiments. The reactor power was measured using the $\nu$ event rate during 7.5 years with a statistical accuracy of 1.5$\%$ in 2 days and with the relative systematic uncertainty of less than 0.5$\%$. The fraction of the antineutrino yield with energies above 8 MeV is measured. A new method of calibration using the Bragg curve for stopping muons is presented.
Speaker: Mark Shirchenko (In person) -
9:30 AM
ICARUS at the Short-Baseline Neutrino program: first results 15m
The ICARUS collaboration employed the 760-ton T600 detector in a successful three-year physics run at the underground LNGS laboratory, performing a sensitive search for LSND-like anomalous $\nu_e$ appearance in the CNGS beam. After a significant overhaul at CERN, the T600 detector has been installed at Fermilab where, in June 2022, the data taking for neutrino oscillation physics began collecting events from BNB and NuMI off-axis beams. ICARUS aims at first to either confirm or refute the claim by Neutrino-4 short-baseline reactor experiment. It will also perform measurements of neutrino cross sections in LAr with the NuMI beam and several BSM searches. ICARUS will soon jointly search for evidence of sterile neutrinos with the Short-Baseline Near Detector (SBND). In this presentation, preliminary results from the ICARUS data with the BNB and NuMI beams are shown both in terms of performance of all ICARUS subsystems and of capability to select and reconstruct neutrino events.
Speaker: Lea Di Noto (INFN e Universita Genova (IT)) -
9:45 AM
Latest results from MicroBooNE’s Low Energy Excess Search and Constraints on eV-Scale Sterile Neutrino Oscillations 15m
The MicroBooNE experiment utilizes liquid argon time projection chamber to detect neutrinos emanating from Fermilab's Booster Neutrino Beam (BNB) and the Neutrinos at the Main Injector (NuMI) beam. MicroBooNE is investigating the observed low energy excess (LEE) of electron neutrino and antineutrino charged current quasielastic events reported by the MiniBooNE experiment. This presentation will report on the search for an electron neutrino excess compatible with the MiniBooNE LEE utilizing the full 5-year dataset of 11e20 POT collected with the BNB from MicroBooNE. Additionally we present the status of searches for short baseline neutrino oscillations within the framework of a 3+1 eV-scale sterile neutrino model. This work combines data from both the BNB and NuMI beams leveraging their substantially different $\nu_e/\nu_\mu$ ratios to mitigate degeneracy resulting from the cancellation of $\nu_e$ appearance and disappearance allowing to greatly enhance the experiment's sensitivity.
Speaker: Miquel Nebot-Guinot -
10:00 AM
Status of the Short-Baseline Near Detector at Fermilab 15m
The Short-Baseline Near Detector (SBND) is one of three Liquid Argon Time Projection Chamber (LArTPC) neutrino detectors positioned along the axis of the Booster Neutrino Beam (BNB) at Fermilab, as part of the Short-Baseline Neutrino (SBN) Program. The detector is currently being commissioned and is expected to take neutrino data this year. SBND is characterized by superb imaging capabilities and will record over a million neutrino interactions per year. Thanks to its unique combination of measurement resolution and statistics, SBND will carry out a rich program of neutrino interaction measurements and novel searches for physics beyond the Standard Model (BSM). It will enable the potential of the overall SBN sterile neutrino program by performing a precise characterization of the unoscillated event rate, and constraining BNB flux and neutrino-argon cross-section systematic uncertainties. In this talk, the physics reach, current status, and future prospects of SBND are discussed.
Speaker: Rodrigo Alvarez-Garrote (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))
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Operation, Performance and Upgrade (incl. HL-LHC) of Present Detectors: Operation, Performance and Upgrade of Present Detectors Terrace 2B
Terrace 2B
Conveners: Marcela Mikestikova (Czech Academy of Sciences (CZ)), André David (CERN)-
8:30 AM
ATLAS upgrades for High Luminosity LHC 18m
The LHC will undergo an upgrade program to deliver an instantaneous luminosity of $7.5\times 10^{34}$ cm$^{-2}$ s$^{-1}$ and collect more than 3 ab$^{-1}$ of data at $\sqrt{s}=$13.6 (14) TeV. To benefit from such a rich data-sample it is fundamental to upgrade the detector to cope with the challenging experimental conditions. The ATLAS upgrade comprises a new all-silicon tracker with extended rapidity coverage; a redesigned TDAQ system for the calorimeters and muon systems allowing the implementation of a free-running readout system. Finally, a new High Granularity Timing Detector will aid the track-vertex association in the forward region by incorporating timing information into the reconstructed tracks. An important ingredient is a precise determination of the delivered luminosity with systematic uncertainties below the percent level. This presentation will describe the ongoing ATLAS detector upgrade status and the main results obtained with the prototypes.
Speaker: Jo Pater (University of Manchester (GB)) -
8:48 AM
The Belle II Upgrade Program 18m
The Belle II experiment at the SuperKEKB $e^+e^-$ collider started recording collision data in 2019, with the ultimate goal of collecting $50~\mathrm{ab}^{-1}$. The wealth of physics results obtained with the current data sample of $424~\mathrm{fb}^{-1}$ demonstrate excellent detector performance. The first years of running, however, also reveal novel challenges and opportunities for reliable and efficient detector operations with machine backgrounds extrapolated to full luminosity. In order to make Belle II more robust and performant at the target luminosity of $6\times 10^{35}~\mathrm{cm}^{-1}\mathrm{s}^{-1}$, a Belle II upgrade is being planned for a 2027-2028 SuperKEKB shutdown. This talk will cover the full range of proposed upgrade ideas, which include the replacement of select readout electronics, upgrades of detector elements, and the possibility of substituting entire detector sub-systems such as the vertex detector.
Speaker: Katsuro Nakamura -
9:06 AM
The LHCb Upgrade II 18m
The Upgrade II of the LHCb experiment is proposed for the long shutdown 4 of the LHC. The upgraded detector will operate at a maximum luminosity of 1.5×1034 cm-2 s-1, with the aim of reaching a total integrated luminosity of ∼300 fb-1 over the lifetime of the HL-LHC. The collected data will probe a wide range of physics observables with unprecedented accuracy, with unique sensitivities for the measurement of CKM phases, charm CP violation, and rare heavy-quark decays.
To achieve this, the current detector performance must be maintained at the expected maximum pile-up of ∼40, and even improved in certain specific areas. It is planned to replace all existing spectrometer components to increase the granularity, reduce the amount of material in the detector and exploit the use of new technologies, including precision timing on the order of tens of picoseconds.
The presentation will review the key points of the physics programme and the main options of the detector design.Speaker: Renato Quagliani (CERN) -
9:24 AM
Performance of the upgraded LHCb detector in Run-3 18m
The LHCb detector underwent a major upgrade after Run-2 of the LHC which
ended in 2018. To fully profit from an increased instantaneous luminosity
of 2x10^33 cm-2s-1 , the lowest level hardware trigger is removed, and the
full event information is shipped to a software trigger at 40 MHz. As a
result, all detector readout electronics is replaced. In addition, the
tracking detectors (consisting of a pixelated vertex locator, a silicon
strip detector and a state-of-the-art scintillating fiber tracker) and the
photodetectors of the two RICH detectors are all newly constructed. In
this presentation the latest results of the LHCb detector performance in
Run-3 will be presented.Speaker: Giulia Tuci (Heidelberg University (DE)) -
9:42 AM
The ITS3 detector and physics reach of the LS3 ALICE Upgrade 15m
During LHC LS3 (2026-28) ALICE will replace its inner-most three tracking layers by a new detector, "ITS3", based on newly developed wafer-scale monolithic active pixel sensors, bent into cylindrical layers, and held in place by light carbon foam edge ribs. Unprecedented low values of material budget (0.07% per layer) and closeness to interaction point (19 mm) lead to a factor two improvement in pointing resolutions from very low $p_{\rm T}$, achieving, for example, 18 $\mu$m in the transversal plane at 1 GeV/c.
After a successful R&D phase 2019-2023, which demonstrated the feasibility of this innovational detector, the final sensor and mechanics are being developed right now.
This contribution will shortly review the conceptual design, the main R&D achievements, and the road to completion and installation. It concludes with a projection of the improved physics performance, for heavy-flavour mesons and baryons, as well as for thermal dielectrons, that will come into reach with ITS3.Speaker: Felix Schlepper (Heidelberg University (DE)) -
9:57 AM
How to upgrade a pixel detector: lessons from Phase-1 being applied to Phase-2 CMS Pixel Upgrade 18m
The High Luminosity Large Hadron Collider at CERN is expected to produce proton collisions at a center-of-mass energy of 14 TeV, aiming to achieve an unprecedented peak instantaneous luminosity of 7 x 10^34 cm^-2 s^-1, implying an average pileup of 200. To cope with these running conditions, the CMS detector will undergo an extensive upgrade: Phase-2. This upgrade includes the complete replacement of the CMS silicon pixel detector, introducing improvements such as increased radiation resilience, finer granularity, and capability to manage increased data rates among other changes. This is, however, the second time CMS has replaced their pixel detector. We will outline the differences and similarities between the Phase-1 and Phase-2 upgrade of the inner tracker of CMS. We will highlight specific lessons learned from operating the Phase-1 detector and how this experience has informed our approach in design and assembly or the Phase-2 inner tracker as we approach preproduction of modules.
Speaker: Rachel Bartek (Catholic University of America)
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Quark and Lepton Flavour Physics South Hall 1B
South Hall 1B
Conveners: Tomas Jakoubek (Weizmann Institute of Science (IL)), Weimin Song (Jilin University College of Physics (CN))-
8:30 AM
Search for Physics beyond the Standard Model at NA62 15m
Rare kaon decays are among the most sensitive probes of both heavy and light new physics beyond the Standard Model description thanks to high precision of the Standard Model predictions, availability of very large datasets, and the relatively simple decay topologies. The $K^{+} \rightarrow \pi^{+}\nu\bar{\nu}$ decay is a “golden mode” for search of New Physics in the flavour sector. The Standard Model provides a high-precision prediction of its branching ratio of less than $10^{-10}$, and this decay mode is highly sensitive to indirect effects of New Physics up to the highest mass scales. The NA62 experiment at the CERN SPS is designed to study the $K^{+} \rightarrow \pi^{+}\nu\bar{\nu}$ decay, and provided the world’s most precise investigation of this decay using 2016--18 data. Building on this success, the status of the analysis of data collected in 2021--2022, after beam-line and detector upgrades, is presented. NA62 is a multi-purpose high-intensity kaon decay experiment, and carries out a broad rare-decay and hidden-sector physics programme with dedicated trigger lines. New results on searches for hidden-sector mediators and searches for violation of lepton number and lepton flavour conservation in kaon decays based on the NA62 2016--2018 dataset are presented. Future prospects of these searches are discussed.
Speaker: Renato Fiorenza (Scuola Superiore Meridionale e INFN Sezione di Napoli) -
8:45 AM
New results from analyses of rare kaon and pion decays at the NA62 experiment 15m
The NA62 experiment at CERN reports new results from the analyses of rare kaon and pion decays, using data samples collected in 2017-2018. A sample of $K^+ \rightarrow \pi^+ \gamma \gamma$ decays was collected using a minimum-bias trigger, and the results include measurement of the branching ratio, study of the di-photon mass spectrum, and the first search for production and prompt decay of an axion-like particle with gluon coupling in the process $K^+ \rightarrow \pi^+ A$, $A \rightarrow \gamma \gamma$. A sample of $\pi^0 \rightarrow e^+ e^-$ decay candidates was collected using a dedicated scaled down di-electron trigger, and a preliminary result of the branching fraction measurement is presented. New searches for lepton flavour violating kaon decays, and for production of a weakly-coupled particle X in the $K^+ \rightarrow \mu^+ \nu X$, $X \rightarrow \gamma \gamma$ decay chain, are also presented.
Speaker: Atakan Tugberk Akmete (Johannes Gutenberg Universitaet Mainz (DE)) -
9:00 AM
The search for $K_L → \pi^0\nu\overline{\nu}$ in the KOTO experiment 15m
The KOTO experiment at J-PARC searches for the rare decay, $K_L → π^0ν\overlineν$. The mode is CP-violating, with a theoretical branching ratio highly suppressed in the Standard Model at $(2.94 ± 0.15) × 10^{−11}$. With a small theoretical uncertainty, this search is sensitive to new physics. In the analysis of 2016-2018 data, there were three observed events within the signal region, consistent with the background estimation. An upper limit on the branching ratio was set at < $4.8 × 10^{−9}$ (90% CL). Since that analysis, new hardware and analysis methods have been implemented to reduce the background level. The search in 2021 had a single event sensitivity of $8.66 × 10^{−10}$ which was comparable to 2016-2018 data taking. There were no events observed in the signal region, allowing KOTO to set the best upper limit on $BR(K_L → π^0ν\overlineν)$ to date at $< 1.99 × 10^{−9}$ (90% CL). I will report on the latest result of the $K_L → π^0ν\overlineν$ search from data taken in 2021.
Speaker: Joseph Redeker -
9:15 AM
KOTO II at J-PARC to measure the branching ratio of $K_L\to \pi^0\nu\overline{\nu}$ 15m
The KOTO II is a next-generation experiment to measure the branching ratio of $K_L\to \pi^0\nu\overline{\nu}$ with 30-GeV proton beam at J-PARC. The KOTO II is a successor of the currently running KOTO experiment. We plan to expand the hadron experimental facility at J-PARC, and construct a new beamline of KOTO II there. The extraction angle of the $K_L$ is 5 degrees, which is smaller than that in KOTO to have more $K_L$ with higher momentum spectrum. The KOTO-II detector is being designed with a 12-m signal decay region and a 3-m diameter calorimeter to have more signal acceptance. The expected numbers of signal and background events are 35 and 40, respectively, where the Standard Model value of branching ratio and $3\times 10^7$-s running time are assumed. The signal can be observed with $5.6\sigma$ significance. The design, current developments, and the expected sensitivity of KOTO II will be reported.
Speaker: Hajime Nanjo (Osaka University (JP)) -
9:30 AM
Progress in the Unitarity Triangles (UTs) and in CP violation 15m
Recent progress achieved in the standard B-unitarity triangle and in the Kaon unitarity triangle is discussed. In particular, we outline how further inroads into the Kaon UT can be made via K0=>pi0+l+l- in both theory and in experiments. In the current precision flavor era, where there are large fluxes of B’s and kaon’s from LHCb, Belle-II, NA62, KOTO and the proposed experiments such as HIKE, we point out new ways to utilize these precious resources to extract vital information on CP violation in order to refine our tests of the CKM-paradigm of CP violation and improve searches for new physics.
Speaker: Amarjit Soni (BNL-HET) -
9:45 AM
Hyperon physics at BESIII 15m
With the large datasets of $𝑒^+𝑒^−$ annihilation at the 𝐽/𝜓 and 𝜓(3686) resonances collected by the BESIII experiment, multi-dimensional analyses making use of polarisation and entanglement can shed new light on the production and decay properties of hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarisation of the (anti)hyperons has been observed in 𝐽/𝜓 or 𝜓(3686) decays to $Λ\bar{Σ}$ , $Σ\bar{Σ}$ , $Ξ\bar{Ξ}$. The decay parameters for the most common hadronic weak decay modes were measured, and due to the non-zero polarization, the parameters of hyperon and antihyperon decays could be determined independently of each other for the first time. Comparing the hyperon and antihyperon decay parameters yields precise tests of direct, $Δ𝑆 = 1$ CP-violation that complement studies performed in the kaon sector.
Speaker: Wenjing Zheng (The Institute of High Energy Physics of The Chinese Academy of Sciences) -
10:00 AM
Testing CPT symmetry with multistrange baryons mass precision measurements with ALICE 15m
In any relativistic quantum field theory, such as Quantum Chromodynamics or Electroweak theory, the interactions are invariant under the combined operation of Charge conjugation (C), Parity transformation (P) and Time reversal (T). One of the consequences of this (CPT) symmetry is that particles and their corresponding antiparticles must have exactly the same mass. While the mass difference between proton and antiproton has been measured with very high precision, the extension to the (multi-)strange baryon domain still lacks precise measurements.
In this contribution, the most precise measurement of mass differences between $\Xi^{-}$ and $\overline{\Xi}^{+}$ and between $\Omega^{-}$ and $\overline{\Omega}^{+}$ using the ALICE detector will be presented, sensibly improving the precision obtained by averaging the results from previous experiments.Speaker: Romain Schotter (Stefan Meyer Institute for Subatomic Physics of the Austrian Academy of Sciences (AT))
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Strong interactions and Hadron Physics North Hall
North Hall
Conveners: Josu Cantero (IFIC/UV-CSIC (ES)), Jan Matousek (Charles University (CZ))-
8:30 AM
Charged particle and underlying event measurements with the ATLAS detector 15m
In this talk, recent measurements of distributions sensitive to the underlying event, the hadronic activity observed in relationship with the hard scattering in the event, by the ATLAS experiment are presented. Underlying event observables like the average particle multiplicity and the transverse momentum sum are measured for Kaons as Lambda baryons as a function of the leading track-jet and are compared to MC predictions which in general fail to describe the data. In addition, a recent measurement of charged-particle multiplicities in diffractive pp collisions are presented. Events are classified using the ATLAS forward proton tagging. An analysis of the momentum differences between charged hadrons in proton-proton, proton-lead and lead-lead collisions is presented. The difference in the yield of hadron pairs with like-sign and opposite-sign charge is used to extract the spectra of pairs adjacent in colour flow. The measurement is sensitive to the dynamics of hadronization.
Speaker: Mustafa Andre 🎈Schmidt (Bergische Universitaet Wuppertal (DE)) -
8:45 AM
Measurement of event shape variables in pp collisions at CMS 15m
Inclusive event shape distributions, as well as event shapes as a function of charge particle multiplicity are extracted from CMS low-pileup and compared with predictions from various generators. Multi-dimensional unfolded distributions are provided, along with their correlations, using state-of-the-art machine-learning unfolding methods.
Speaker: Mr Saikat Karmakar (National Taiwan University (TW)) -
9:00 AM
Exclusive production processes in CMS 15m
We will present results on exclusive production processes in CMS, including the production of charged hadron or lepton pairs. To select these signatures, some analyses use intact protons tagged in the TOTEM roman pot detectors.
Speaker: Christophe Royon (The University of Kansas (US)) -
9:15 AM
Measurements of W and Z boson production in association with jets in ATLAS 15m
The production of W/Z bosons in association with light or heavy flavor jets or hadrons at the LHC is sensitive to the flavor content of the proton and provides an important test of perturbative QCD. In this talk, measurements by the ATLAS experiment probing the charm and beauty content of the proton are presented. Inclusive and differential cross-sections of Z boson production with at least one c-jet, or one or two b-jets are measured for events in which the Z boson decays into a pair of electrons or muons. Moreover, the production of W boson in association with D+ and D*+ mesons will be discussed. This precision measurement provides information about the strange content of the proton. Finally, measurements of inclusive, differential cross sections for the production of missing transverse momentum plus jets are presented.
Speaker: Yi Yu (University of Science and Technology of China (CN)) -
9:30 AM
Vector boson associated with jets in CMS 15m
The study of the associated production of vector bosons and jets constitutes an excellent environment to check numerous QCD predictions. Total and differential cross sections of vector bosons produced in association with jets have been studied in pp collisions using CMS data. Differential distributions as a function of a broad range of kinematical observables are measured and compared with theoretical predictions.
Speaker: Qun Wang (DESY) -
9:45 AM
Multi-differential charged-particle jet fragmentation in pp collisions with ALICE 15m
Jet substructure measurements, using the distribution of final state hadrons, provide insight into partonic shower and hadronisation. Observables for such measurements include the transverse momentum ($j_\mathrm{T}$) and longitudinal momentum fraction ($z$) of jet constituent particles. ALICE has recently measured the $j_\mathrm{T}$ distributions of the jet fragments in proton-proton and proton-lead collisions $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV, which are well-described by parton-shower models. This talk will present a new ALICE measurement of jet fragmentation in pp collisions, which extends to multiple dimensions in $j_\mathrm{T}$ and $z$ to provide a more detailed picture of the parton shower and fragmentation processes. The measured $j_\mathrm{T}$ distributions are characterized by a fit that separately constrains the hadronization and perturbative components of the shower. The final results and their fitted distributions are compared with the theoretical predictions.
Speaker: Jaehyeok Ryu (Pusan National University (KR)) -
10:00 AM
Classifying hadronic objects in ATLAS with ML/AI algorithms 15m
Hadronic object reconstruction is one of the most promising settings for cutting-edge machine learning and artificial intelligence algorithms at the LHC. In this contribution, highlights of ML/AI applications by ATLAS to particle and boosted-object identification, MET reconstruction and other tasks will be presented.
Speaker: Da Xu (Chinese Academy of Sciences (CN))
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Top Quark and Electroweak Physics Club E
Club E
Conveners: Rene Poncelet (IFJ PAN Krakow), Peter Berta (Charles University, Prague (CZ))-
8:30 AM
Measurements of W and Z bosons in CMS 15m
The latest measurements on W and Z boson production, decays and properties at CMS obtained with CMS proton collision data at 13 and 13.6 TeV are presented. Some of these measurements lead to constraints to SM parameters and to new physics models.
Speaker: Federico Vazzoler (Deutsches Elektronen-Synchrotron (DE)) -
8:45 AM
Measurements of W, Z and Drell-Yan processes in ATLAS 15m
The study of single W and Z boson production at the LHC provides stringent tests of the electroweak theory and perturbative QCD. The ATLAS experiment has measured the W boson production cross section in the LHC data collected in 2022 at 13.6 TeV. By forming ratios of Z, W, and ttbar production cross sections, this measurement becomes a sensitive probe of the quark and gluon content of the proton. Measurements of the transverse momentum of the W and Z boson at 5 and 13 TeV from dedicated LHC runs with reduced instantaneous luminosity are also presented. A search for exclusive hadronic decays of the W boson to single pions, Kaons or rho-mesons in association with a photon are highlighted, and provide a test bench for the quantum chromodynamics factorization formalism. Differential cross sections as functions of mass and rapidity are presented for the neutral current Drell-Yan process in the invariant mass regions below and above the Z-boson peak.
Speaker: Xuewei Jia (Chinese Academy of Sciences (CN)) -
9:00 AM
Recent developments in the GENEVA event generator 15m
The GENEVA method provides a means to combine resummed and fixed order calculations at state-of-the-art accuracy with a parton shower program. GENEVA NNLO+PS generators have now been constructed for a range of colour-singlet production processes and using a range of different resolution variables. I will review the GENEVA framework and then describe several recent advancements, such as the use of jet veto resummation at NNLL' accuracy and the ongoing extension to processes including jets in the final state.
Speaker: Matthew Lim (University of Sussex) -
9:15 AM
Combining QED and QCD transverse-momentum resummation for W and Z boson production at hadron colliders 15m
In this talk, we discuss the main features of the combined QCD and QED resummation formalism for weak vector boson production at hadron colliders. Specifically, resummation is realized at NNLL+NNLO in QCD with the inclusion of mixed QCD-QED effects at LL and pure QED ones at NLL matched with fixed-order full-EW NLO contribution (i.e. at one loop). Since the naive Abelianization of the QCD formalism is not suitable when considering an electrically charged final state, we exploited the heavy-quark resummation formalism, thereby properly incorporating QED final-state soft radiation. Numerical results at hadron colliders are presented for relevant kinematic distributions: on-shell Z and W boson transverse-momentum distributions and their ratio. We found that QED effects can reach up to the percent level, potentially important in view of SM parameters extraction.
Speaker: Andrea Autieri -
9:30 AM
Measurement of single W and Z boson properties in the Forward Region 15m
The LHCb experiment covers the forward region of proton-proton collisions, and it can improve the current electroweak landscape by studying the production of electroweak bosons in this phase space complementary to ATLAS and CMS. The precision measurements of the properties of single W and Z boson at LHCb could not only provide stringent test of the Standard Model, but also are essential inputs for the PDF global fitting. In this talk the most latest results on the single W and Z boson property measurements, using the LHCb Run-2 data-sets, will be presented, which will includes the single Z boson production measurement at 5.02 TeV, the weak mixing angle measurement, and the W/Z rare decay searches.
Speaker: Mr Ahmed Abdelmotteleb (University of Warwick (GB)) -
9:45 AM
Electroweak input parameter schemes and precise theoretical predictions for Drell-Yan 15m
At hadron colliders, charged and neutral Drell-Yan processes can be used for a high precision determination of the W-boson mass and the weak mixing angle through template fits. Since these measurements rely on Monte Carlo templates, it is crucial to have both flexible and accurate event generators.
In this contribution, we present the latest updates of the Z_ew-BMNNPV package for the simulation of the neutral-current Drell-Yan process at NLO QCD plus NLO EW accuracy with exact matching to QCD and QED parton shower in the POWHEG-BOX framework, ranging from the development of new electroweak input parameter/renormalization schemes, like the MSbar one useful for the measurement of the MSbar running of the weak mixing angle, to the implementation of higher-order fermionic corrections. We perform a detailed comparison of the predictions obtained in the different input parameter/renormalization schemes, discussing their main features and the related theory uncertainties.
Speaker: Mauro Chiesa -
10:00 AM
Precision measurements of Standard Model parameters in ATLAS 15m
ATLAS has used the W and Z boson production processes to perform a range of precision measurements of SM parameters. The production rate of Z+jet events with large missing transverse momentum is used to measure the decay width of the Z boson decaying to neutrinos. Differential measurements of this topology with minimal assumptions on theoretical calculations are discussed and allow comparisons to the Standard Model as well as the interpretation in beyond-the-Standard-Model scenarios. Finally, the LHC pp collision data collected by the ATLAS experiment at sqrt(s)=7 TeV is revisited to measure the W boson mass and its width.
Speaker: Jakub Kremer (Deutsches Elektronen-Synchrotron (DE))
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Coffee break Foyer Floor 2
Foyer Floor 2
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Accelerators: Physics, Performance, and R&D for future facilities Club D
Club D
Convener: Gaku Mitsuka (KEK)-
10:45 AM
Physics Program for Super Tau-Charm Facility 15m
The proposed STCF is a symmetric electron-positron beam collider designed to provide e+e− interactions at a centerof-mass energy from 2.0 to 7.0 GeV. The peaking luminosity is expected to be 0.5×10^35 cm−2s−1. STCF is expected to deliver more than 1 ab−1 of integrated luminosity per year. The huge samples could be used to make precision measurements of the properties of XYZ particles; search for new sources of CP violation in the strange-hyperon and tau−lepton sectors; make precise independent mea-surements of the Cabibbo angle (theta)c) to test the unitarity of the CKM matrix; search for anomalous decays with sensitivities extending down to the level of SM-model expectations and so on. In this talk, the physics interests will be introduced as well as the the recent progress on the project R&D.
Speaker: Haiping Peng (University of Science and Technology of China (CN)) -
11:00 AM
Accelerator design and R&D efforts for Super Tau-Charm Facility 15m
Super Tau-Charm Facility (STCF) was proposed as a third-generation circular electron-positron collider of 2-7 GeV (CoM) and 510^34 cm^-2s^-1 (luminosity), aiming to explore charm-tau physics in the next decades. This presentation will introduce the accelerator design and R&D efforts for STCF. Under the financial support of the local provincial and national funding agencies, the STCF accelerator team is working on the conceptual design of the accelerator. The accelerator consists of an injector and two collider rings. The injector will provide full-energy electron and positron beams for top-up injections. The collider rings with typical third-generation features are designed to have an extremely low beta (<1 mm), a large Piwinski angle (>10) and a high beam current (2 A) with the Crab-Waist collision scheme. Several challenges have been identified for intense study and R&D efforts, e.g. a very short Touschek lifetime of less than 300 s and twin-aperture superconducting magnets at IR.
Speaker: Prof. Jingyu Tang (University of Science and Technology of China) -
11:15 AM
Study status of Beam Backgrounds and MDI Design at the CEPC 15m
The machine-detector interface (MDI) issues are one of the most complicate and challenging topics at the Circular Electron Positron Collider (CEPC). Comprehensive understandings of the MDI issues are decisive for achieving the optimal overall performance of the accelerator and detector. The machine will operate at different beam energies, therefore, a flexible interaction region design will be plausible to allow for the large beam energy range. The design has to provide high luminosity that is desirable for physics studies, but keep the radiation backgrounds tolerable to the detectors. This requires careful balance of the requirements from the accelerator and detector sides.
In this talk, the latest design of the CEPC MDI based on CEPC Technical Design Report (TDR) will be presented, covering the design of the beam pipe and whole IR, the estimation of beam induced backgrounds, the mitigating schemes, and also our plan towards the Ref-TDR of CEPC detector.Speaker: Haoyu Shi -
11:30 AM
Status of HALHF - a concept for a hybrid asymmetric linear Higgs factory 15m
The HALHF concept utilises beam-driven plasma-wakefield acceleration to accelerate electrons to very high energy and collide them with much lower-energy positrons accelerated in a conventional RF linac. This idea, which avoids difficulties in the plasma acceleration of positrons, has been used to design a Higgs factory that is much smaller, cheaper and greener than any other so far conceived. The talk will outline the original design, discuss the challenges of doing physics with a significantly boosted final state and describe a number of possible energy and facility upgrades. Finally the current status of the design will be given, including possible evolution in several parameters and next steps towards a more optimised design that can form the basis for a pre-Conceptual Design Report.
Speaker: Brian Foster (University of Oxford (GB)) -
11:45 AM
Progress in the center-of-mass energy calibration and monochromatization at FCC-ee 15m
The CERN Future Circular electron-positron Collider (FCC-ee) will enable extreme precision physics experiments from the Z-pole up to above the top-pair production threshold. Very precise beam energy measurements will be performed by resonant depolarization (RD) of e+ and e- pilot bunches, using novel 3D-polarimeters. Additional measurements will be needed to reduce the center-of-mass energy uncertainty to the level of the statistical precision of 4 keV ($m_Z$, $\Gamma_Z$) and 250 keV ($m_W$) expected for key Standard Model parameters. In addition, monochromatization of the beams, down to a few MeV, is necessary to observe the resonant s-channel e+e- → H(125) production; of which a first optics implementation has been achieved.
Speaker: Aurelien Martens (Université Paris-Saclay (FR)) -
12:00 PM
A crystal-based positron source for lepton colliders 15m
Positron source yield is crucial for achieving the required luminosity in future lepton colliders. The conventional approach involves an e-beam impinging a high-density solid target to initiate an electromagnetic shower and capture positrons afterwards. But, this scheme is limited by the Peak Energy Deposited Density(PEDD) on the target before its structural failure.
We can utilize the large photon emission in axial channeling within a high-Z crystal to increase positron yield and/or decrease target thickness, thus lowering the PEDD[^]. Together with the conventional scheme, the crystal-based one is under study for the FCC-ee injector design[*].
We carried out experiments at DESY and CERN PS with high-Z crystal and e-beam with energy useful for FCC-ee.The results were used to validate a new simulation model implemented in Geant4 that will be included in the injector design[@].^ DOI:10.1140/epjc/s10052-022-10666-6
* DOI:10.18429/JACoW-IPAC2019-MOPMP003
@ DOI:10.1007/s40042-023-00834-6Speaker: Nicola Canale (Universita e INFN, Ferrara (IT)) -
12:15 PM
R&D for positron sources at high-energy lepton colliders 15m
Positron Sources for high luminosity high-energy colliders are a challenge for all future lepton colliders as, for instance, the International Linear Collider (ILC) as well as new concepts as the HALHF collider design. In the talk new R&D developments for the undulator-based positron source are discussed. The talk includes current prototypes for optic matching devices as pulsed solenoid as well as plasma lenses. The applicability of the positron source for the ILC as well as for the HALHF concept are discussed.
Speaker: gudrid moortgat-pick
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Astro-particle Physics and Cosmology South Hall 2B
South Hall 2B
Convener: Denise Boncioli-
10:45 AM
The HERD experiment: beyond the current energy limits in direct detection of cosmic rays 20m
The HERD (High Energy cosmic-Radiation Detection facility) experiment is a future experiment for the direct detection of high energy cosmic rays that will be installed on the Chinese space station in 2027. It is constituted by an innovative calorimeter made of about 7500 LYSO scintillating crystals assembled in a spheroidal shape and it is surrounded on five faces by multiple sub-detectors, in order to detect particles entering from five sides.
It will extend direct measurements of cosmic rays of more than one order of magnitude in energy, measuring proton and nuclei fluxes up to the PeV/nucleon energy region, performing the first direct measurement of the cosmic proton and helium knee. HERD will also measure the high energy electron+positron flux and high energy photon flux to search for possible indirect signals of dark matter and perform multi-messenger astronomy.
In this talk the HERD experiment, its scientific goals and its detector design will be introduced.Speaker: Dr Pietro Betti (Department of Physics and Astronomy, University of Florence and INFN sezione di Firenze) -
11:05 AM
Design and Performance of MiniFIT, the small-scale version of the HERD particle tracker 15m
The High Energy cosmic-Radiation Detection facility (HERD) will be the largest calorimetric experiment dedicated to the direct detection of cosmic rays. HERD aims at probing potential dark matter signatures by detecting electrons from 10 GeV and photons from 500 MeV, up to 100 TeV. It will also measure the flux of cosmic protons and heavier nuclei up to a few PeV, shedding light on the origin and propagation mechanisms of high-energy cosmic rays. HERD will be equipped with a scintillating-fiber tracker (FIT) read out by silicon photomultipliers that will enable the reconstruction of charged particle trajectories, the measurement of their absolute electric charge, and the enhancement of photon conversion into electron-positron pairs. A miniature version of the FIT sector, called MiniFIT, was designed, built, and tested with particle beams at CERN. This presentation will delve into the design and physics performance of MiniFIT, particularly focusing on its space and charge resolution.
Speaker: Dr Chiara Perrina (EPFL - Ecole Polytechnique Federale Lausanne (CH)) -
11:20 AM
Measurement of inelastic hadronic cross sections in space with DAMPE 20m
The Dark Matter Particle Explorer (DAMPE) is an ongoing space-borne experiment for the direct detection of cosmic rays (CR). Thanks to its large geometric acceptance and thick calorimeter, DAMPE is able to detect CR ions up to unprecedented energies of hundreds of TeV. Following by now more than 8 years of successful operation, DAMPE has amassed a large dataset of high-energy hadronic interactions in a regime that is often difficult to probe by accelerator experiments. In this contribution, we show how DAMPE data can be used to measure inelastic ion-nucleon cross sections, and present a cross section measurement of both proton and helium on the BGO calorimeter. The phenomenological A^2/3 and nuclear-radius scaling is then used to compare our measurements to existing accelerator data and other experimental results.
Speaker: Paul Coppin (Universite de Geneve (CH)) -
11:40 AM
New results obtained from CALET observations after 8 years of data collection on the International Space Station 20m
The Calorimetric Electron Telescope (CALET) is a cosmic-ray observatory operating since October 2015 on the International Space Station. The primary scientific goals of the CALET mission include the investigation of the mechanism of cosmic-ray acceleration and propagation in the Galaxy and the detection of potential nearby sources of high-energy electrons and potential dark matter signatures. The CALET instrument can measure the inclusive spectrum of cosmic electrons and positrons up to about 20 TeV. In addition, it can measure the energy spectra and elemental composition of cosmic-ray nuclei from H to Fe and the abundance of trans-iron elements up to about 1 PeV. Finally, it can monitor the gamma-ray sky up to about 10 TeV, search for signals from gravitational-wave event candidates, and observe gamma-ray burst events. In this contribution the on-orbit performance of the instrument and the main results obtained during the first 8 years of operation will be reported and discussed.
Speaker: Dr Sandro Gonzi (University of Florence) -
12:00 PM
Astronomical X-ray Polarimetry as a diagnostic for questions of fundamental Physics. What we learned from the Imaging X-Ray Polarimetry Explorer (IXPE).. 20m
In half a century of predictions on the potential of X-Ray polarimetry, we have encountered ideas—sparse yet not infrequent—on how it could provide insights into several fundamental physics problems. These include birefringence or strong-gravity effects as evidence of photon propagation in extreme magnetic or gravitational fields, anomalies in propagation over large distances due to Lorentz Invariance Violations, or signs of the existence of Axion-Like Particles. Some measurements were proposed for individual objects, while others pointed to a modifications of a distribution. Nowadays, we can benefit from two years in orbit of IXPE, the first space observatory entirely dedicated to polarimetry of celestial X-ray sources in 2-8 keV energy band, resolved in time, energy, and angle. IXPE observed about 60 sources across almost all classes. In this talk, we will review some of the proposed measurements of fundamental physics and how they align with the world unveiled by IXPE.
Speaker: Dr Paolo Soffitta (INAF-IAPS)
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Beyond the Standard Model: Block 2 South Hall 1A
South Hall 1A
Conveners: Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE)), Michal Malinsky (Charles University (CZ))-
10:45 AM
Dark Matter searches at LHCb 17m
The LHCb detector at the LHC offers unique coverage of forward rapidities. The detector also has a flexible trigger that enables low-mass states to be recorded with high efficiency, and a precision vertex detector that enables excellent separation of primary interactions from secondary decays. This allows LHCb to make significant (and world-leading) contributions in these regions of phase space in the search for long-lived particles that would be predicted by dark sectors which accommodate dark matter candidates. A selection of results from searches of heavy neutral leptons, dark photons, axions, hidden-sector particles, and dark matter candidates produced from heavy-flavour decays among others will be presented, alongside the potential for future measurements in some of these final states.
Speaker: Felicia Volle (University of Birmingham (GB)) -
11:02 AM
Dark Sector searches with electron and positron beams at NA64@CERN 17m
Several astrophysical observations indicate that the majority of the mass of the Universe is made of a new type of matter, called Dark Matter (DM), not interacting with light. DM may be composed of a dark sector (DS) of new particles, charged under a new U(1) gauge boson kinetically mixed with the ordinary photon, called dark photon (A'). The NA64 experiment at CERN aims to produce and detect DS particles using the 100 GeV SPS electron beam impinging on a thick active target (electromagnetic calorimeter). In accordance with the ERC funded project POKER, from 2022 NA64 started collecting data also with positron beams, in order to exploit the DS production yield enhancement due to the positron resonant annihilation process. This talk will present latest NA64 results and its future outlook, with a special focus on the progress and perspectives of the positron beam measurement, reporting the sensitivity of the experiment to several beyond SM scenarios.
Speaker: Anna Marini (INFN-Genova) -
11:19 AM
The search for ${K_{L}^{0}\rightarrow\gamma+dark\:photon(\bar\gamma)}$ at the KOTO experiment. 17m
We present the study of the massless dark photon ($\bar\gamma$) in the $K_{L}^{0}\rightarrow\gamma\bar\gamma$ decay at the J-PARC KOTO experiment. Distinguished from the massive dark photon, the massless one does not directly mix with the ordinary photon but could interact with Standard Model (SM) particles through direct coupling to quarks. Some theoretical models propose that the branching ratio ($\mathcal{BR}$) of the $K_{L}^{0}\rightarrow\gamma\bar\gamma$ decay could reach up to $\mathcal{O}(10^{-3})$, which is well within the KOTO's sensitivity for this study. Although the challenge is posed by the lack of kinematic constraints, the KOTO hermetic veto system provides a unique opportunity to probe for such decay. In this presentation, we will present the open-box result of the $K_{L}^{0}\rightarrow\gamma\bar\gamma$ search based on the data collected in 2020.
Speaker: TONG WU (National Taiwan University) -
11:36 AM
UV/IR flavour connection in axion models 17m
Flavour violation in axion models can be generated by choosing flavour non-universal Peccei-Quinn(PQ) charges. Such an axion is easily implemented in a UV completion with a DFSZ model: containing two Higgs doublets (PQ-2HDM) and the PQ scalar. This charge arrangement also produces flavour violation at tree level in the PQ-2HDM, which we will show it is directly correlated to the flavour violation of the axion. This general relation allows us to link flavour violating observables across the scales of the axion and the 2HDM, in such a way that information of one sector is directly related with the other. We will show in two examples how this can be done using flavour violating observables in the quark and lepton sector, finding an interesting interplay between astrophysical and LHC searches.
Speaker: Xavier Ponce Diaz (INFN Padova) -
11:53 AM
Correlating neutrino magnetic moment and inert scalar dark matter in Type-III radiative scenario 17m
We discuss dark matter phenomenology, neutrino magnetic moment and their masses in a Type-III radiative scenario. The Standard Model is enriched with three vector-like fermion triplets and two inert scalar doublets to provide a suitable platform for the above phenomenological aspects. The inert scalars contribute to total relic density of dark matter in the Universe. Neutrino aspects are realised at one-loop with magnetic moment obtained through charged scalars, while neutrino mass gets contribution from charged and neutral scalars. Taking inert scalars up to $2$ TeV and triplet fermion in few hundred TeV range, we obtain a common parameter space, compatible with experimental limits associated with both neutrino and dark matter sectors. Finally, we demonstrate that the model is able to provide neutrino magnetic moments in a wide range from $10^{-12}\mu_B$ to $10^{-10}\mu_B$, meeting the bounds of various experiments such as Super-K, TEXONO, Borexino and XENONnT.
Speaker: Rukmani Mohanta -
12:10 PM
Search for dark photons in heavy-ion collisions 17m
The vector $U$-bosons, or so called 'dark photons', are one of the possible candidates for the dark matter mediators. We present a procedure to define theoretical constraints on the upper limit of $\epsilon^2(M_U)$ from heavy-ion as well as $p+p$ and $p+A$ dilepton data from SIS to LHC energies. We used the microscopic Parton-Hadron-String Dynamics (PHSD) transport approach which reproduces well the measured dilepton spectra in $p+p$, $p+A$ and $A+A$ collisions. In addition to the different dilepton channels originating from interactions and decays of ordinary (Standard Model) matter particles (mesons and baryons), we incorporate in the PHSD the decay of hypothetical $U$-bosons to dileptons, $U\to e^+e^-$, where the $U$-bosons themselves are produced by the Dalitz decay of pions, $\eta$-mesons, Delta resonances as well as by vector meson decays. This analysis can help to estimate the requested accuracy for future experimental searches of 'light' dark photons by dilepton experiments.
Speaker: Adrian William Romero Jorge (Frankfurt Institute for Advanced Studies, Ruth Moufang Str. 1, 60438 Frankfurt, Germany & Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany)
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Dark Matter Club A
Club A
Conveners: Sara DIGLIO (SUBATECH/CNRS/In2p3), Dr Irene Bolognino (The University of Adelaide)-
10:45 AM
Latest results from the XENONnT dark matter experiment 17m
XENONnT is the current experiment of the XENON dark matter (DM) project, currently in data acquisition at the INFN Laboratori Nazionali del Gran Sasso (Italy). The detector employs a LXe dual-phase TPC with an active target mass of 5.9 t. The TPC is surrounded by two water Cherenkov detectors, which serve as active muon and neutron veto systems.
XENONnT completed its first science run (SR0) with a collected exposure of 1.1 tonne-year. The lowest background level ever achieved with this kind of detectors, allowed for the most sensitive search for solar axions, bosonic DM and WIMP search.
With the subsequent longer science run (SR1), XENONnT improves upon those results, and enables the possibility of directly observing, for the first time, the CE$\nu$NS interaction of solar ($^8B$) neutrinos.
Recently, the NV performances are boosted by doping water with Gadolinium gaining more sensitivity to ultra-rare processes involving DM and neutrino physics.Speaker: Pietro Di Gangi -
11:02 AM
Status of the LUX-ZEPLIN (LZ) experiment: a direct search for dark matter 17m
LUX-ZEPLIN (LZ) is an experiment built for direct detection of dark matter with world-leading sensitivity over a diverse science program. LZ has been operating at the Sanford Underground Research Facility (SURF) in South Dakota since 2021. The experiment employs three nested detectors; a central dual phase TPC with 7 tonnes of xenon in its active region, an instrumented liquid xenon skin, and an outer detector featuring tanks of gadolinium-loaded liquid scintillator. This talk will provide an overview of the LZ experiment and report on the most recent status in its operation and searches.
Speaker: Nicolas Angelides (Imperial College London) -
11:19 AM
Background Modeling for the LUX-ZEPLIN Dark Matter Experiment 17m
LUX-ZEPLIN (LZ) is a dark matter experiment located at the Sanford Underground Research Facility in South Dakota, USA employing a 7 tonne active volume of liquid xenon in a dual-phase time projection chamber (TPC). It is surrounded by two veto detectors to reject and characterize backgrounds. A comprehensive material assay and selection campaign for detector components, along with a xenon purification campaign, have ensured an ultra-low background environment. In its first science run (SR1) LZ attained a background rate of (6.3 ± 0.5) x 10$^{−5}$ events/kg/day/keVee in the < 15 keVee region, enabling it to achieve world-leading limits for the spin-independent elastic scattering of nuclear recoils of WIMPs with masses above 10 GeV/c$^2$. This talk will provide an overview of how LZ has reached even lower background rates and improved its background modeling in its current science run. The impacts of these improvements on LZ’s WIMP sensitivity and science results will also be discussed.
Speaker: Daniel Kodroff (Lawrence Berkeley National Lab) -
11:36 AM
DARWIN - The Ultimate Liquid-xenon-based Astroparticle Observatory 17m
Dark Matter (DM) still eludes detection by modern experiments and its nature puzzles the minds of physicists. Weakly Interacting Massive Particles (WIMPs) are commonly seen as one of the prime candidates for the role of DM. The DARk matter WImp search with liquid xenoN (DARWIN) detector is envisioned to be the ultimate multi-tonne xenon-based direct detection astroparticle observatory. Hosting a time projection chamber with 40 tonnes of liquid xenon at its core, with a keV-range threshold and an ultra-low radioactive background it will aim to probe the entire parameter space for WIMP DM down to the so-called neutrino fog. Moreover, DARWIN's scientific research program also includes searches for solar axions, axion-like particles, as well as measurements of the solar neutrino flux and a probe of the Majorana nature of neutrinos. This talk outlines the key technological and physics challenges associated with DARWIN, and the recent progress of the collaboration to address them.
Speaker: Alexey Elykov (KIT) -
11:53 AM
The CYGNO experiment 17m
CYGNO is developing a high-precision gaseous Time Projection Chamber to be installed at the Gran Sasso National Laboratories (LNGS) for directional studies of rare low energy events, as dark matter. The detector consists in a TPC filled with He:CF4 gas mixture operating at atmospheric pressure with a triple GEM amplification stage. The gas scintillating properties allow the realization of an optical readout which comprises photomultipliers tubes and extremely low-noise granular sCMOS camera sensors. This technology provides a set of information on the recoil tracks, as released energy, 3D topology and position down to few keV of energy deposits, granting the advantages of a directional detector.
We will present the latest results on the underground operation at LNGS of a 50 l, 50 cm drift prototype focusing on the MonteCarlo-data comparison. In addition, we will show the design and features of the CYGNO demonstrator, a 0.4 m3 detector whose installation is foreseen for 2025 at LNGS.Speaker: Melba D'Astolfo -
12:10 PM
Light dark matter search at PandaX 17m
PandaX-4T detector is a dual phase xenon time projection chamber. In 2021, the commissioning run set the most stringent limit on dark matter-nucleon spin-independent interactions in the mass range from GeV to TeV level. However, for sub-GeV light dark matter, the nuclear recoil energy falls below the detection threshold of approximately 5 keV in the traditional search window requiring the selection of paired scintillation and ionization signals. To search for the light dark matter, we selected ionization-only events and lowered the detection threshold down to approximately 0.8 keV. In such a low energy window, two types of dominant backgrounds were identified in the PandaX-4T commissioning run, namely micro-discharge and cathode activity. In this talk, the latest search result using ionization-only events in the data of the first scientific run of PandaX-4T will be presented, together with further studies on the origin and discrimination of the main backgrounds in this energy window.
Speaker: minzhen zhang (SJTU)
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Detectors for Future Facilities, R&D, Novel Techniques Club H
Club H
Conveners: Dr David Attié (CEA/Irfu - Université Paris-Saclay (FR)), Tanaz Mohayai (Indiana University)-
10:45 AM
Development of LiCl aqueous solution for neutrino detection for Jinping Neutrino Experiment 17m
We have studied saturated LiCl water solution for the neutrino detection for Jinping Neutrino Experiment. The solution takes advantage of the high electron-neutrino charge-current interaction cross-section with Li-7, high natural abundance of Li-7, and the high solubility of LiCl. We have achieved a 50-m long attenuation length at 430 nm. The solution is good in studying energy-dependent solar neutrino physics, including the solar neutrino upturn effect and light sterile neutrino. The sensitivity of a hundred-ton-scale Jinping detector is comparable with other multi-thousand-ton detectors. The contained Cl-35 and Li-6 also make a delayed-coincidence detection for electron-antineutrino possible. The Jinping Neutrino Experiment can measure the crust geo neutrinos of Tibet. In addition to being a pure Cherenkov detector medium, a wavelength shifter, carbostyril 124, is added to the LiCl aqueous solution enabling the development of a water-based Cherenkov-enhanced lithium-rich detector.
Speaker: Zhe Wang -
11:02 AM
Amorphous Selenium based VUV Photodetector for use in Noble Element Detectors 17m
Large scale noble element time projection chambers (TPC's) play a central role in many HEP experiments. Future planned experimental programs using noble element TPC's aim to construct very large detectors, up to the multi-kiloton scale. Pixel based 3D readout offers the opportunity to realize such robust large scale noble element TPC's by recording the information from ionization events in an natively 3D way, however offer a new set of challenges in detection of the scintillation light. In particular, searching for photoconductive materials which are capable of converting VUV light to charge could open the doorway to a potentially game changing solution of an integrated charge and light (Q+L) sensor for large area pixel based noble element detectors. In this presentation we will explore a novel photodetector design based on single layer graphene and amorphous selenium (aSe) as a potential integrated Q+L sensor and show some preliminary results from the first manufactured devices.
Speaker: Iakovos Tzoka -
11:19 AM
Characterization and understanding of novel 8-inch microchannel plate photomultiplier tubes 17m
Microchannel plate photomultiplier tubes working in photon-counting
mode to detect extremely low number of photons see adoption at the
future large liquid-based neutrino detectors. By coating materials of
high secondary electron yield by the atomic layer deposition at the
end face of the microchannel plates, collection efficiencies of
photo-electrons are pushed to 100%. That, however, introduces a
single electron charge spectra departing from the Gaussian
distribution. Based on laboratory measurements, we present the
mechanism of electron amplification at the end face and formulate a
probabilistic model of the single electron charge spectra. Our
simplified model with Gamma-Tweedie mixture is straightforwardly
deployed in future neutrino experiments under commissioning.Speaker: Prof. Benda Xu (Tsinghua University at Beijing) -
11:36 AM
Sub-GeV particle identification with aerogel Cherenkov threshold detectors and tagged photon beam for the Water Cherenkov Test Experiment 17m
The Water Cherenkov Test Experiment (WCTE) will be installed in CERN's recently upgraded T9 “Test Beam” Area in Summer 2024. It has three goals: to prototype photosensor and calibration systems for Hyper-Kamiokande, to develop new calibration and reconstruction methods for water Cherenkov detectors and to measure lepton and hadron scattering on Oxygen.
The collaboration performed a 3-week-long beam test in July 2023. It uses newly developed aerogel Cherenkov threshold counters (ACTs) to perform an efficient separation of pions from muons in the sub-GeV range, which had not been done before. Additionally, a new compact tagged photon beamline was developed, composed of a Neodymium (N52) Halbach array permanent magnet and a hodoscope array placed downstream of the magnet. The combination of the ACTs and tagged photon beamline provides sub-GeV p, e, pi, mu and gamma test beams. Using this setup, the collaboration was able to estimate the beam flux of CERN's T9 beam.Speaker: Alie Craplet (Imperial College (GB)) -
11:53 AM
Q-Pix: ASIC Development and First Prototypes for Pixelated Charge Readout 17m
The Q-Pix concept is a continuously integrating low-power charge-sensitive amplifier (CSA) viewed by a Schmitt trigger. When the trigger threshold is met, the comparator initiates a ‘reset’ transition and returns the CSA circuitry to a stable baseline. The reset time is captured in a 32-bit clock value register, buffers the cycle and then begins again. The time difference between one clock capture and the next sequential capture, called the Reset Time Difference (RTD), measures the time to integrate a integrated quantum of charge (Q). Waveforms are reconstructed without differentiation and an event is characterized by the sequence of RTDs. Q-Pix offers the ability to extract all track information providing very detailed track profiles and also utilizes a dynamically established network for DAQ for exceptional resilience against single point failures. This talk will present the first results of the Q-Pix 180 nm ASICs, introduce novel light-based prototypes, and discuss future tests.
Speaker: Shion Kubota (University of Manchester (GB))
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Education and Outreach Club C
Club C
Conveners: Connie Potter (CERN), David Barney (CERN), Miroslav Myska (Czech Technical University in Prague (CZ))-
10:45 AM
Particle Pâtisserie: Communicating Particle Physics with Cakes 15m
A novel approach to science communication is presented, using cake to explain particle physics ideas to engage new audiences. This talk will present a public engagement strategy where baking has been used to engage the general public, both at in-person events and with online platforms such as social media and virtual science fairs. This innovative approach using the juxtaposition of cake and physics makes for a fun and memorable experience, and has been demonstrated to engage new and low science capital audiences and spark their interest in particle physics.
Speaker: Katharine Leney (Southern Methodist University (US)) -
11:00 AM
BeInspired – The Art and Science Project 15m
The BeInspired project for high school students aims to dispel the myth that individuals are inherently inclined towards either the sciences (such as mathematics and physics) or the humanities and arts. Instead, the project seeks to foster a dialogue between the artistic and technical aspects of each individual.
The project began with an initial one-day workshop, where students were introduced to particle physics and art through lectures and hands-on artistic activities with real artists. Following this workshop, students collaborated with their teachers at their schools to create artistic artifacts.
Throughout the project, we met with students several times via Zoom. We organized Master Classes on particle physics, virtual visits to CERN, and discussions on the preparation of artifacts. The culmination of the project will be an exhibition at ICHEP 2024.
In this presentation, we will discuss the main concept, the details of the realization, and the results of the entire process.Speaker: Michael Hoch (Florida State University (US)) -
11:15 AM
"Art & Science across Italy": a journey between Science and Art in high schools 15m
Creativity and vision are essential across disciplines, shaping both artistic and scientific endeavors. "Art & Science across Italy", a project led by the Italian National Institute for Nuclear Physics (INFN) in collaboration with CERN, cultivates a broad perspective in high-school students to disseminate scientific knowledge. Embracing the STEAM field, it integrates STEM and arts without privileging one over the other. Throughout the project, high school students attend scientific seminars and subsequently, drawing inspiration from science, create their own artworks. These artworks are then showcased in local and national art exhibitions. In the fourth edition (2022-2024), 6500 students produced 1000 artworks showcased in 20 exhibitions. This talk outlines the project, methodology, and key results.
Speaker: Giuliana Galati (Universita e INFN, Bari (IT)) -
11:30 AM
The Cosmic Piano, a high energy physics detector for outreach purposes 15m
The Cosmic Piano is designed to detect Muons generated by the arrival of cosmic rays to Earth. When Muons impact a module, sounds and flashes of light are generated, by means of a phase shift fiber and two avalanche photodiodes (APD) placed at the ends of the fiber, the flashes are detected, converting them into electrical pulses. The APDs collect the light produced by the scintillator plastic, processed, and different activities can be carried out with this detector through the configuration options it has. Every time a cosmic ray is detected, a sound and a flash of light are produced, and the number of events detected by each channel is displayed through a screen. This system is composed of 5 modules a control and data processing system where the operation of the detector is configured. This way we can show what particle detection is like and demonstrate through sounds and lights that attract the attention of many people because each module has a particular musical note.
Speaker: Hector David Regules Medel (Autonomous University of Puebla (MX)) -
11:45 AM
When physicists met novellists : the success story of Collision 15m
For the first time ever, the CERN community has collaborated with established (non-science) writers to produce an anthology of fictional short stories. The stories, based on submissions of ideas from the world-wide CERN community, were put together in a book entitled Collisions : Stories from the Science of CERN, co-edited by Rob Appleby of Manchester University and Connie Potter of CERN. The book has sold thousands of copies and has been a huge success. We talk about the idea, the process and the marketing of such a unique public outreach project, which has left the public wanting more.
Speaker: Connie Potter (CERN) -
12:00 PM
Learning Astronomy Through An Immersive Science Fiction Experience 15m
I present a new method of teaching that blends a science fiction narrative into an intermediate
level astronomy course. “The Salvation of the Yggdrasil” is a sci-fi scenario where students must
solve a series of challenges to guide the people of an intergenerational spaceship through a
catastrophe and set them safely back on their journey to a new home amongst the stars. Each
challenge requires the students to conceptually understand and apply the astronomy and
physics concepts presented in the class, while also building proficiency in the skills of problem
solving, critical thinking, collaboration, and interdisciplinary work. Based on the principles of
Self-determination Theory, the curriculum is designed to give students opportunities to explore
their own interests in an environment that strongly instills a sense of intrinsic motivation. This
presentation focuses on the methods the class uses and initial observations and results from
the first run of the class.Speaker: Sean Lindsay (University of Tennessee, Knoxville) -
12:15 PM
Open discussion 15m
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Heavy Ions Club B
Club B
Convener: Katarina Krizkova Gajdosova (Czech Technical University in Prague (CZ))-
10:45 AM
Recent flow and correlation measure- ments in large and small collision systems with ATLAS 17m
This talk presents a comprehensive overview of recent ATLAS measurements of collective flow phenomena in a variety of collision systems. Measurements of the mean, variance, and skewness of the distribution of event-by-event per- particle average transverse momentum, [pT] are reported for Pb+Pb collisions at 5.02 TeV and Xe+Xe collisions at 5.44 TeV. These measurements give insight into the nature of the spatial energy fluctuations in the QGP produced in heavy- ion collisions. Measurements of the azimuthal anisotropy of high-pT particles in Pb+Pb collisions, using two and four-particle cumulants are presented. The high-pT vn measurements provide information on the path-length dependence of parton energy loss in the QGP. Two sets of measurements that investigate if the presence of jets affects the flow-like behavior observed in pp collisions are also presented.
Speaker: Alexander Kevin Gilbert (AGH University of Krakow) -
11:02 AM
Unraveling the origin of collectivity in high and low multiplicity pp and p--Pb collisions in ALICE at the LHC 17m
We investigate the possibility of a partonic phase in small systems with the elliptic flow of mesons (π⁺⁻, K⁺⁻, K⁰) and baryons (p+p̅, Λ+Λ̅) in high-multiplicity p--Pb collisions at $\sqrt{s_{{\rm NN}}}$ = 5.02 TeV and pp collisions at $\sqrt{s}$ = 13 TeV measured by ALICE. The results show a grouping (with 1$\sigma$ significance) and splitting (with 5$\sigma$ confidence) behavior of $v_2$ at intermediate pt. This phenomenon, reminiscent of partonic flow in heavy-ion collisions, has been observed with such high precision for the first time in small collision systems. Comparison with the hydrodynamic model with hadronization via quark coalescence indicates the formation of a deconfined partonic medium in small systems. We further extend these measurements down to the low multiplicity in pp collisions employing large pseudorapidity separation (5.0 < |$\Delta\eta$| < 6.0) to explore the limits to the formation of the collective medium and presence of partonic degrees of freedom.
Speaker: Wenya Wu (Fudan University (CN)) -
11:19 AM
Collective effects in small collision systems from PYTHIA8 and EPOS4 simulations 17m
Studies have yielded strong evidence that a deconfined state of quarks and gluons, the quark-gluon plasma, is created in heavy-ion collisions. This hot and dense matter exhibits almost zero friction and a strong collective behavior. An unexpected collective behavior has also been observed in small collision systems. In this talk, the origin of collectivity in small collision systems, which is still not understood, is addressed by confronting different tunes of PYTHIA8 and EPOS4 event generators using measurements of azimuthal correlations for inclusive and identified particles. In particular, anisotropic flow coefficients measured using two- and four-particle correlations with various pseudorapidity gaps and balance functions are reported in different multiplicity classes of pp collisions at $\sqrt{s}=13.6$ TeV and p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV. Comparisons with available experimental data are also presented.
Speaker: Diana Catalina Brandibur (Institute of Space Science (RO)) -
11:36 AM
Unravelling the partonic flow in small systems with an improved multi-phase transport model 17m
Precision measurements of transverse momentum-differential elliptic flow, $v_{2}(p_{\rm T})$, of identified particles have been done in proton-lead (p-Pb) collisions. The characteristic mass-ordering of $v_{2}(p_{\rm T})$ at low $p_{\rm T}$ and the grouping/splitting of $v_{2}(p_{\rm T})$ for mesons and baryons at intermediate $p_{\rm T}$, which have been regarded as the smoking gun of QGP signal, are observed in p-Pb collisions. However, the exact physics mechanism is not entirely clear. A multi-phase transport (AMPT) model incorporating a partonic phase followed by quark coalescence hadronization can reproduce the flow measurements. The mass-ordering can be reproduced in p-Pb collisions by the standard AMPT, while the grouping/splitting remains challenging. This talk significantly improves the coalescence in AMPT by implementing a precise quark phase-space distribution, which reproduces the measured grouping/splitting of $v_{2}(p_{\rm T})$ in p-Pb collisions for the first time.
Speaker: Ms Xiangpan Duan (Fudan University) -
11:53 AM
Clocking the particle production and tracking of strangeness balance and radial flow effects at top LHC energy with ALICE 17m
Balance functions have been used extensively to elucidate the time evolution of quark production in heavy-ion collisions. Early models predicted two stages of quark production, one for light quarks and one for the heavier strange quark, separated by a period of isentropic expansion. This led to the notion of clocking particle production and tracking radial flow effects, which drive the expansion of the system. In this talk, balance functions of identified particles in different multiplicity classes of pp Run 3 collisions at $\sqrt{s} = 13.6\;\text{TeV}$ recorded by ALICE are reported. The results are compared with different models as well as with previously published results on pp and Pb-Pb collisions at different energies. The results enable tracking the balancing of electric charge and strangeness by measuring how the widths and integrals of the charge and strangeness balance functions evolve across the collision energies.
Speaker: Victor Gonzalez (Wayne State University (US)) -
12:10 PM
Measuring system-size and event-topology dependence of (multi-)strangeness production 17m
Measurements of light-flavour particle production in small collision systems at the LHC energies have shown the onset of features that resemble what is typically observed in nucleus- nucleus collisions. New results on the (multi-)strange hadron production in Pb–Pb collisions at $\sqrt{s_{\rm NN}}$ =5.02 and 5.36 TeV will be presented. These results are discussed in the context of recent measurements of light-flavour hadron production in pp collisions at $\sqrt{s}$ =0.9 and 13.6 TeV collected by the ALICE experiment. In order to understand the strangeness production mechanism, angular correlation between multi- strange and associated identified hadrons are measured and compared with predictions from the string-breaking model PYTHIA8, the cluster hadronisation model HERWIG7, and the core-corona model EPOS-LHC. In addition, the connection of strange hadron production to hard scattering processes and to the underlying event is studied, using di-hadron correlations triggered with the highest-$p_{\rm T}$ hadron in the event.
Speaker: Lucia Anna Tarasovicova (Pavol Jozef Safarik University (SK))
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Higgs Physics South Hall 2A
South Hall 2A
Conveners: Eleni Vryonidou (University of Manchester (GB)), Linda Finco (INFN Torino (IT))-
10:45 AM
STXS and differential Higgs boson cross section measurements at CMS 17m
We will discuss the latest differential measurements of Higgs boson cross sections with the CMS detector. Both fiducial differential cross section measurements and measurements in the simplified template cross section framework will be presented. The data collected during Run 2 of the LHC by the CMS experiment are used. We also present interpretations of these measurements as constraints on anomalous interactions.
Speaker: Benedetta Camaiani (Universita e INFN, Firenze (IT)) -
11:02 AM
Search for rare processes and lepton-flavor-violating decays of Higgs boson at the ATLAS experiment 17m
The Standard Model predicts several rare Higgs boson processes, among which are the production in association with c-quarks, the decays to a Z boson and a photon, to a low-mass lepton pair and a photon, and to a meson and photon. The observation of some of these processes could open the possibility of studying the coupling properties of the Higgs boson in a complementary way to other analyses. In addition, lepton-flavor-violating decays of the observed Higgs boson are searched for, where on observation would be a clear sign of physics effects beyond the Standard Model. Several results for decays based on pp collision data collected at 13 TeV will be presented.
Speaker: Bing Zhou (University of Michigan (US)) -
11:19 AM
Searches for rare Higgs boson decays at CMS 17m
The couplings of the Higgs boson to fermions have been studied with third and second generation quarks and leptons, while no direct measurements of its interactions with the lighter u,d,s quarks have been performed to date. The search for ultra rare decays H->gamma+ phi/rho/K*0 can probe these couplings. While the contribution to the rate of these decays from the diagrams involving Yukawa couplings is negligible in the Standard Model (SM), in theories beyond the SM this contribution could be significantly enhanced and deviations from the SM branching ratios could be observed because of the interference with the dominant diagrams, where meson is formed via Higgs boson decays to Z bosons or photons. Results with data collected by the CMS experiment at a centre of mass energy of 13 TeV will be shown.
Speaker: Mr Rocco Ardino (Universita e INFN, Padova (IT)) -
11:36 AM
Measurements of the CP structure of Higgs-boson couplings with the ATLAS detector 17m
While the Standard Model predicts that the Higgs boson is a CP-even scalar, CP-odd contributions to the Higgs boson interactions with vector bosons or fermions are presently not strongly constrained. A variety of Higgs boson production processes and decays can be used to study the CP nature of the Higgs boson interactions. This talk presents the most recent CP measurements of such analyses by the ATLAS experiment, based on pp collision data collected at 13 TeV.
Speaker: Matthew Basso (TRIUMF (CA)) -
11:53 AM
Anomalous Higgs boson couplings and CP properties at CMS 17m
To fully characterize the Higgs boson, it is important to establish whether it presents coupling properties that are not expected in the Standard Model of particle physics. These can probe BSM effects, such as CP conserving or CP violating couplings to particles with masses not directly accessible at the LHC through virtual quantum loops. In this talk we will present the most recent searches from the CMS experiment for anomalous Higgs boson interactions.
Speaker: Dermot Anthony Moran (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES)) -
12:10 PM
Prospects for single- and di-Higgs measurements at the HL-LHC with the ATLAS experiment 17m
The large dataset of about 3 ab-1 that will be collected at the High Luminosity LHC (HL-LHC) will be used to measure Higgs boson processes in detail. Studies based on current analyses have been carried out to understand the expected precision and limitations of these measurements. The large dataset will also allow for better sensitivity to di-Higgs processes and the Higgs boson self coupling. This talk will present the prospects for Higgs and di-Higgs results with the ATLAS detector at the HL-LHC.
Speaker: Song-Ming Wang (Academia Sinica (TW))
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Neutrino Physics: Oscillations Panorama
Panorama
Convener: Viktor Pec (FZU - Institute of Physics of the Czech Academy of Sciences)-
10:45 AM
Measurement of the Solar pp Neutrino Flux in PandaX-4T 15m
The precise measurement of solar neutrino flux is essential for the Standard Solar Model (SSM) and neutrino physics. The proton-proton (pp) fusion chain dominates the neutrino production in the Sun, and pp neutrinos contribute roughly 91% of the solar neutrino flux. PandaX-4T, an experiment located in China Jinping underground Laboratory, aims to detect dark matter and astrophysical neutrinos using a large-scale dual-phase xenon TPC. In this talk, using the 0.63 tonne×year exposure of PandaX-4T, the first measurement of solar pp neutrinos below 165 keV electron recoil energy with a natural xenon detector will be presented.
Speaker: Xiaoying Lu -
11:00 AM
T2K Neutrino Oscillation Analysis 15m
T2K is a long-baseline experiment for the measurement of neutrino and antineutrino oscillations. (Anti)neutrinos are produced by the J-PARC accelerator and measured at the ND280 near detector, and then at the Super-Kamiokande far-detector, in Kamioka.
The most recent results of neutrino oscillations will be presented, featuring world-leading sensitivities on the search of Charge-Parity violation, by comparing oscillation measurements of neutrinos and antineutrinos. Measurements of the atmospheric parameters $\sin^2\theta_{23}$ and $\Delta m^2_{23}$, are extracted from the rate of muon neutrino disappearance and electron neutrino appearance. The results include data collected with first Gd-loading at the far detector, which required a revision of the selection strategy and systematic uncertainties modelling the detector response.
The T2K results will be assessed in terms of their statistical interpretation and alternative parameterisations, and unitarity triangles will be presented.
Speaker: Denis CARABADJAC -
11:15 AM
Neutrino Oscillation Analysis with Combined Data from Super-Kamiokande and T2K 15m
The nature of the neutrino mass ordering and whether neutrino oscillations violate CP symmetry remain among several open questions surrounding PMNS mixing. At present no single experiment has the ability to resolve these issues. Atmospheric neutrino data at Super-Kamiokande (Super-K) and accelerator neutrino data from T2K, however, offer complementary sensitivity to these puzzles. As both neutrino sources are observed at the same detector, Super-K, there is a clear benefit to analyzing the data sets together. This presentation will report results from the first such combined analysis, which utilizes unified uncertainty models of both neutrino interactions and the detector response. Combined constraints on open questions in the PMNS paradigm, including studies of the mass ordering and CP violation, using 3244.4 days of Super-K atmospheric neutrino data combined with beam neutrino data corresponding to 36e20 protons-on-target from T2K’s first 10 run periods will be presented.
Speaker: Jianrun HU (Kyoto University) -
11:30 AM
A New Measurement of Neutrino Oscillations at NOvA 15m
NOvA is a long-baseline neutrino oscillation experiment with a one megawatt beam and near detector at Fermilab and a far detector 810 km away in northern Minnesota. It features two functionally identical scintillator tracking calorimeter detectors. The near detector samples the beam before significant oscillations to allow the measurement of muon-neutrino disappearance and electron-neutrino appearance, and their antineutrino counterparts, at the far detector. These measurements are used to measure neutrino mass differences and the parameters of the PMNS mixing matrix. In this talk, results of a new analysis featuring double the neutrino-mode beam exposure are presented.
Speaker: Kathryn Sutton -
11:45 AM
T2K+NOvA Joint Measurement of Neutrino Oscillation Parameters 15m
T2K and NOvA are two currently active long-baseline neutrino oscillation experiments studying $\nu_\mu$/$\bar{\nu}_\mu$ disappearance and $\nu_e$/$\bar{\nu}_e$ appearance in $\nu_\mu$/$\bar{\nu}_\mu$ accelerator neutrino beams.
This talk presents a joint T2K+NOvA neutrino oscillation analysis within the standard three active neutrino flavor paradigm, which includes each experiment’s fully detailed detector simulations and takes advantage of the experiments’ complementary oscillation baselines of 295 km and 810 km and neutrino energies around 0.6 GeV and 2 GeV for T2K and NOvA, respectively.
The combination of the differing sensitivities to neutrino oscillation and the T2K+NOvA data could constrain the oscillation parameters better than either experiment alone. Within a unified Bayesian inference, the results from the first T2K+NOvA joint neutrino oscillation measurement will be presented.
Speaker: Tomas Nosek (National Centre for Nuclear Research (PL)) -
12:00 PM
Tau neutrino appearance and the measurement of the neutrino mass-ordering at Super-Kamiokande 15m
One of the open questions in neutrino physics is that of the mass-ordering. In the three flavor paradigm, it is unknown if the masses of the three massive neutrinos are arranged in the normal (m1>m2>m3) or inverted (m3>m1>m2) ordering. Atmospheric neutrinos, which are electron and muon neutrinos produced in the atmosphere by cosmic rays, provide a window into the neutrino mass-ordering. If the mass-ordering is normal (inverted), we expect a resonance of electron neutrinos (anti-neutrinos). At Super- Kamiokande (SK), the signal from resonance is obscured by tau neutrinos arising from the oscillation of the atmospheric neutrino flux. Consequently, the sensitivity of SK towards mass-ordering depends on its ability to effectively remove the background of oscillated tau neutrinos. We present the latest measurement of tau neutrino appearance at SK and potential enhancements to the experiment's sensitivity to the neutrino mass-ordering by constraining tau neutrinos with a neural network.
Speaker: Maitrayee Mandal (National Centre for Nuclear Research (PL)) -
12:15 PM
Neutrino oscillation physics in JUNO 15m
The Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose neutrino detector under construction in China. It is located 700 m underground, 53 km away from 8 nuclear reactors. It will use 20 kt of liquid scintillator surrounded by 17,512 20" photomultipliers and 25,600 3" photomultipliers to detect neutrino interactions with a 3% energy resolution at 1 MeV. JUNO's main physics goals are the determination of the neutrino mass ordering and the high-precision measurement of $\Delta m^2_{21}$, $\sin^2\theta_{12}$, and $\Delta m^2_{31}$.
I will present how JUNO can measure the reactor antineutrino oscillations to reach a $3\sigma$ sensitivity to the neutrino mass ordering with 6 years of data. JUNO can also measure atmospheric neutrino oscillations to enhance this sensitivity. After 6 years, JUNO will improve the current precision on $\Delta m^2_{21}$, $\sin^2\theta_{12}$, and $\Delta m^2_{31}$ by an order of magnitude, achieving precision well below the sub-percent level.
Speaker: Steven Calvez (Subatech CNRS)
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Operation, Performance and Upgrade (incl. HL-LHC) of Present Detectors: Operation, Performance and Upgrade of Present Detectors Terrace 2B
Terrace 2B
Conveners: Marcela Mikestikova (Czech Academy of Sciences (CZ)), André David (CERN)-
10:45 AM
Operation and performance of the upgraded ALICE Inner Tracking System 18m
The ALICE detector underwent significant upgrades during the LHC Long Shutdown 2 from 2019 to 2021. A key upgrade was the installation of the new Inner Tracking System (ITS2), comprising 7 layers with 12.5 billion pixels over 10 m², enhancing its tracking capabilities using the ALPIDE chips that are capable of recording Pb-Pb collisions at an interaction rate of 50 kHz. It offers a significant improvement in impact parameter resolution and tracking efficiency at low transverse momentum, attributed to its increased granularity, low material budget of only 0.36% X0/layer for the innermost 3 layers and the closer positioning of the first layer to the interaction point.
ITS2 was successfully commissioned in ALICE, becoming operational with the start of LHC Run 3. This presentation will give an overview of ITS2's operational experience and first performance results, covering aspects of detector operation, calibration, alignment and tracking performance in both pp and Pb-Pb collisions.
Speaker: Jian Liu (University of Liverpool (GB)) -
11:03 AM
Tracker alignment of the CMS detector with Run 3 data 15m
The tracking system of the CMS experiment is the world’s largest silicon tracker with its 1856 and 15148 silicon pixel and strip modules, respectively. To accurately reconstruct trajectories of charged particles the position, rotation and curvature of each module must be corrected such that the alignment resolution is smaller than, or comparable to, the hit resolution. This procedure is known as tracker alignment.
At the end of 2022 and 2023 the alignment was optimized with the aim to improve physics precision in the data reprocessing. A new inner layer of the barrel pixel was installed prior to Run 3 resulting in an increased need to mitigate irradiation of the pixel modules. In addition, the tracker alignment must account for other changes in track reconstruction caused by e.g. temperature variations and magnet cycles. The results of this effort are presented with a focus on physics performance, highlighting the strategies employed to tackle the challenges from Run 3 data-taking.
Speaker: Henriette Aarup Petersen (Deutsches Elektronen-Synchrotron (DE)) -
11:18 AM
Operational Experience and Performance with the ATLAS Pixel detector at the Large Hadron Collider at CERN 18m
The tracking performance of the ATLAS detector relies critically on its 4-layer Pixel Detector. As the closest detector component to the interaction point, this detector is subjected to a significant amount of radiation over its lifetime. At present, at the start of 2024-Run3 LHC collision ATLAS Pixel Detector on innermost layers, consisting of planar and 3D pixel sensors, will operate after integrating fluence of O(10^15) 1 MeV n-eq cm2. The ATLAS collaboration is continually evaluating the impact of radiation on the Pixel Detector. In this talk the key status and performance metrics of the ATLAS Pixel Detector are summarised, putting focus on performance and operating conditions with special emphasis to radiation damage and mitigation techniques adopted for LHC Run3. These results provide useful indications for the optimisation of the operating conditions for the new generation of pixel trackers under construction for HL-LHC upgrades.
Speaker: Soshi Tsuno (High Energy Accelerator Research Organization (JP)) -
11:36 AM
The LHCb SciFi Tracker 18m
The LHCb Experiment is running after its first major upgrade to cope with increased luminosities of LHC Run3, being able to improve on many world-best physics measurements. A new tracker based on scintillating fibers (SciFi) replaced Outer and Inner Trackers and is delivering an improved spatial resolution for the new LHCb trigger-less era, with a readout capable of reading ~524k channels at 40MHz. Fully automated calibration routines for SciFi Detector Devices, based on dedicated software tools and operational procedures, were validated during SciFi commissioning and have been applied to further improve the detector performance since the beginning of Run3. This oral presentation demonstrates the experience gained on SciFi operations during data taking - such as solutions to improve performance - and presents early results showing the performance after commissioning versus the expected one. Foreseen challenges to face with detector aging and luminosity upgrades will also be presented.
Speaker: Ulisses De Freitas Carneiro Da Graca (CBPF - Brazilian Center for Physics Research (BR)) -
11:54 AM
ATLAS ITk Pixel Detector Overview 18m
To cope with the resulting increase in occupancy, bandwidth and radiation damage at the HL-LHC, the ATLAS Inner Detector will be replaced by an all-silicon system, the Inner Tracker (ITk). The innermost part will consist of a pixel detector with an active area of about 13m^2. Several silicon sensor technologies will be employed. The pixel modules assembled with RD53B readout chips have been built to evaluate their production rate. Irradiation campaigns were done to evaluate their thermal and electrical performance before and after irradiation. A new powering scheme – serial – will be employed, helping to reduce the material budget of the detector as well as power dissipation. This contribution presents the status of the ITk-pixel project focusing on the lessons learned and the biggest challenges towards production, from mechanics structures to sensors, and it will summarize the latest results on closest-to-real demonstrators built using module, electric and cooling services prototypes.
Speaker: Francisca Munoz Sanchez (University of Manchester (GB)) -
12:12 PM
The ATLAS ITk Strip Detector System for the Phase-II LHC Upgrade 18m
The HL-LHC is expected to provide an integrated luminosity of 4000 fb-1, that will allow to perform precise measurements in the Higgs sector and improve searches of new physics at the TeV scale. ATLAS is currently preparing for the HL-LHC upgrade, and an all-silicon Inner Tracker (ITk) will replace the current Inner Detector, with a pixel detector surrounded by a strip detector. The strip system consists of 4 barrel layers and 6 EC disks. After completion of final design reviews in key areas, such as Sensors, Modules, Front-End electronics and ASICs, a large scale prototyping program has been completed in all areas successfully. We present an overview of the Strip System, and highlight the final design choices of sensors, module designs and ASICs. We will summarise results achieved during prototyping and the current status of production on various detector components, with an emphasis on QA and QC procedures.
Speaker: Zhengcheng Tao (University of British Columbia (CA))
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10:45 AM
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10:45 AM
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12:30 PM
Quark and Lepton Flavour Physics South Hall 1B
South Hall 1B
Conveners: Stefan Schacht (University of Manchester), Lucia Grillo (University of Glasgow (GB))-
10:45 AM
Run-2/3 measurement of the muon anomalous magnetic moment by the Muon g-2 experiment at Fermilab 15m
The Muon g-2 experiment at Fermilab aims to measure the muon magnetic moment anomaly, aμ = (g−2)/2, with a final accuracy of 0.14 parts per million (ppm). The experiment’s first result, published in 2021 and based on Run-1 data collected in 2018, confirmed the previous result obtained at Brookhaven National Laboratory with a similar sensitivity of 0.46 ppm. In this talk, we will present the improvements in systematic and statistical uncertainties in the latest result, based on the 2019 and 2020 datasets of Run-2 and Run-3. These datasets contain a factor of four more data than in Run-1, thus entering a new sensitivity regime to g-2 which led to the unprecedented uncertainty of 0.20 ppm. We will also discuss the future prospects for the experiment, the projected uncertainties on aμ for the final publication which will include the last three datasets collected from 2021 to 2023, and an overview of the comparison with the Standard Model prediction for muon g-2.
Speaker: Prof. Kim Siang Khaw (Tsung-Dao Lee Institute, Shanghai Jiao Tong University) -
11:00 AM
Measurement of the anomalous spin precession frequency ωa in the Muon g −2 experiment at Fermilab 15m
The Muon $g-2$ Experiment at Fermilab aims to measure the muon magnetic moment anomaly, $a_{\mu} = (g-2)/2$, with a final accuracy of 0.14 parts per million (ppm). A $3.1$-GeV muon beam is injected into a storage ring of $14\,$m diameter, in the presence of a $1.45\,$T magnetic field. The anomaly $a_\mu$ can be extracted by accurately measuring the anomalous muon spin precession frequency $\omega_a$, based on the arrival time distribution of decay positrons observed by $24$ calorimeters, and the magnetic field. In 2023, the experiment published a result based on the 2019 and 2020 datasets, reaching the unprecedented sensitivity of $0.20\,$ppm. In this talk, I will outline the major systematic uncertainties on the $\omega_a$ frequency and provide an overview of the ongoing $\omega_a$ analysis for the last three datasets, collected from 2020 to 2023, along with the projected uncertainties on the final Muon $g-2$ measurement at Fermilab.
Speaker: Lorenzo Cotrozzi -
11:15 AM
Combination of highly correlated measurements of the muon precession frequency in magnetic field for the FNAL measurement of the muon magnetic anomaly 15m
We describe the procedures that were developed to verify the consistency and combine multiple independent analyses of the muon precession measurement by the FNAL-E989 collaboration. These procedures were applied to the first (2021) and second (2023) results published by the collaboration. To properly verify the consistency of different analyses up to 20 ppb, correlations have been modeled and estimated, in several cases exploiting bootstrap techniques. A combination procedure has been designed to combine highly correlated measurements to obtain a robust final result with a small (sub-ppm) but nevertheless conservative uncertainty.
Speaker: Alberto Lusiani (Scuola Normale Superiore and INFN, sezione di Pisa) -
11:30 AM
Measurement of the $e^+e^-\to \pi^+\pi^-\pi^0$ cross section in the centre-of-mass range 0.62 to 3.5$~$GeV at Belle$~$II 15m
We report a measurement of the $e^+e^-\to\pi^+\pi^-\pi^0$ cross section in the energy range from 0.62$~$GeV to 3.5$~$GeV using an initial-state radiation technique. We use an $e^+e^-$ data sample corresponding to $191~\mathrm{fb}^{-1}$ of integrated luminosity, collected at a centre-of-mass energy at or near the $\Upsilon(4S)$ resonance with the Belle$~$II detector at the SuperKEKB collider. The uncertainty at the $\omega$ and $\phi$ resonances is 2.2%. The leading order hadronic vacuum polarization contribution to the muon anomalous magnetic moment using this result is $a^{3\pi}_{\mu}= (49.02\pm 0.23\pm 1.07)\times 10^{-10}$.
Speakers: Yuki Sue, Yuki Sue (Nagoya University) -
11:45 AM
LFV muon decays study with neutrino NSI 15m
Lepton flavor violation (LFV) is a suitable avenue to look for physics beyond the SM. The observation of neutrino oscillation has opened a new window, indicating new physics. In our work, we study the charged LFV $\mu$ decays such as $\mu\rightarrow e\gamma$, $\mu \rightarrow eee$, and $(\mu - e)_{\text{Ti}}$ with a vector leptoquark ($U_3$) by considering the constraints from non-standard neutrino interaction (NSI) sector parameter $\epsilon_{e\mu}$. We consider that these NSIs are attributed to the presence of leptoquarks to account for the difference in the experimental observations of $\delta_{CP}$ measurement by NOvA and T2K. We obtained the branching ratios with uncertainties for three decay modes: $(\mu \rightarrow e \gamma) \leq 10^{-18}$, $(\mu \rightarrow eee) \leq 10^{-21}$ and $(\mu \rightarrow e)_{\text{Ti}} \leq 10^{-19}$.Our results show an improvement in the current limits, which can be explored in the future experiments.
Speaker: Anjan Giri -
12:00 PM
The latest results of the MEG II experiment 15m
The MEG II experiment searches for the lepton flavour violating decay $\mu^+\to e^+\gamma$ with the world's most intense continuous muon beam at the Paul Scherrer Institute and high-performance detectors, aiming at ten times higher sensitivity than the previous MEG experiment. The result with the first dataset in 2021 was published, and the MEG II experiment took data in 2022 and 2023 corresponding to ten times larger data statistics than in 2021 and a more than twenty-fold increase in data statistics is anticipated by 2026 to reach the sensitivity goal. The latest results from the MEG II experiment will be presented.
Speaker: Dr Wataru Otani (University of Tokyo (JP)) -
12:15 PM
A search for muon-to-electron conversion at J-PARC : The COMET experiment 15m
The COMET Experiment at J-PARC aims to search for the lepton-flavour violating process of muon to electron conversion in a muonic atom, $\mu^{-}N\rightarrow\mathrm{e}^{-}N$, with a 90% confidence level branching-ratio limit of $6\times 10^{-17}$, in order to explore the parameter region predicted by most well-motivated theoretical models beyond the Standard Model. In order to realize the experiment effectively, a staged approach to deployment is employed; COMET Phase-I & II. At the Phase-I experiment, a precise muon-beam measurement will be conducted, and a search for $\mu^{-}N\rightarrow\mathrm{e}^{-}N$ will also be carried out with an intermediate sensitivity of $7\times 10^{-15}$ (90% CL upper limit).
The dedicated proton beam-line was recently completed and its commissioning run (COMET Phase-$\alpha$) was successfully conducted in 2023. In this paper, the construction status and some prospects of the experiment are presented in addition to the experimental overview.
Speaker: Hajime Nishiguchi
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10:45 AM
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10:45 AM
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12:30 PM
Strong interactions and Hadron Physics North Hall
North Hall
Conveners: Josu Cantero (IFIC/UV-CSIC (ES)), Katerina Lipka (Deutsches Elektronen-Synchrotron (DE))-
10:45 AM
Energy Energy correlators in DIS 15m
The Energy-Energy Correlator is an observable that explores the angular correlations of energy depositions in detectors at high-energy collider facilities. It has been extensively studied in the context of precision QCD. In this presentation, I will discuss our recent work on the energy-energy correlator in the context of Deep Inelastic Scattering. In the limit where the energy emissions are back-to-back, the proposed observable is sensitive to the universal transverse momentum-dependent parton distribution functions and fragmentation functions. In the collinear limit, a definition of the nuclear energy-energy correlator was introduced. We would revisit the NEEC definition, which involves weighting the EEC by Bjorken x, and conducting the study across the entire phase space region.
Speaker: Haitao Li (Shandong University) -
11:00 AM
Multi-differential Jet Substructure Measurement in High Q2 ep collisions with HERA-II Data 15m
The radiation pattern within high energy quark and gluon jets (jet substructure) is used as a precision probe of QCD and for optimizing event generators. As compared to hadron colliders, the precision achievable by collisions involving electrons is superior, as most of the complications from hadron colliders are absent. Therefore jets are analyzed in deep inelastic scattering events, recorded by the H1 detector at HERA. This measurement is unbinned and multi-dimensional, making use of machine learning to unfold for detector effects. The fiducial volume is given by momentum transfer $Q^2>150$ GeV$^2$, inelasiticity $0.2< y < 0.7$, jet transverse momentum $p_{T,jet}>10$ GeV, and jet pseudorapidity $-1<\eta_{jet}<2.5$. The jet substructure is analyzed in the form of generalized angularites, and is presented in bins of $Q^2$ and $y$. All of the available object information in the events is used by means of graph neural networks. The data are compared with a broad variety of predictions.
Speaker: Vinicius Massami Mikuni (Lawrence Berkeley National Lab. (US)) -
11:15 AM
First measurement of groomed event shape observables in deep-inelastic electron-proton scattering at HERA 15m
The H1 Collaboration at HERA reports the first measurement of groomed event shapes in deep inelastic ep scattering (DIS) at $\sqrt{s} = 319$ GeV, using data recorded between 2003 and 2007 with an integrated luminosity of $351.1\pm 9.5$ pb$^{−1}$. Event shapes in DIS collisions provide incisive probes of perturbative and non-perturbative QCD, and recently developed grooming techniques investigate similar physics in jet measurements of hadronic collisions. This paper presents the first application of grooming to DIS data. The analysis is carried out in the Breit frame, utilizing the novel Centauro jet clustering algorithm. Events are selected with squared momentum–transfer $Q^2 > 150$ GeV$^2$ and inelasticity $0.2 < y < 0.7$. Cross sections of groomed event 1-jettiness and groomed invariant jet mass are measured for several choices of grooming parameter. The measurements are compared to Monte Carlo models and to analytic calculations based on Soft Collinear Effective Theory (SCET).
Speaker: Radek Zlebcik (Deutsches Elektronen-Synchrotron (DE)) -
11:30 AM
Measurement of the 1-jettiness event shape observable in deep inelastic electron-proton scattering at HERA 15m
The H1 Collaboration reports the first measurement of the 1-jettiness event shape observable $\tau_{1}^{b}$ in neutral-current deep-inelastic electron-proton scattering. The analysis is based on data recorded in 2003-2007 by the H1 detector at the HERA collider for ep collisions at sqrt(s)=319 GeV, with integrated luminosity of 351.1 pb$^{-1}$. The observable $\tau_{1}^{b}$ is equivalent to a thrust observable defined in the Breit frame. The triple differential cross section is presented as a function of $\tau_{1}^{b}$, event virtuality $Q^2$, and inelasticity y, in the kinematic region $Q^2 > 150$ GeV$^2$. The data are compared to predictions from Monte Carlo event generators and NNLO pQCD calculations. These comparisons reveal sensitivity of this observable to QCD parton shower and resummation effects, the magnitude of the strong coupling constant, and proton parton distribution functions, as well as the modeling of hadronization and fragmentation.
Speaker: Johannes Hessler (Max Planck Society (DE)) -
11:45 AM
Measurement of jet substructure with the ATLAS detector 15m
Measurements of the substructure of jets are presented using 140 fb-1 of proton-proton collisions with sqrt(s)=13 TeV center-of-mass energy recorded with the ATLAS detector at CERN Large Hadron Collider. Various results are presented including the measurement of non-perturbative track functions, or, the ratio of a jet transverse momentum carried by its charged constituents to its complete transverse momentum. The first differential cross-section measurement of Lund sub-jet multiplicities using dijet events and the measurement of the Lund Jet Plane in ttbar events are also shown in this contribution. Moreover, the measurements of the substructure of top-quark jets are presented using top quarks which are reconstructed with Antikt algorithm with a radius parameter R=1.0.
Speaker: Craig Macleod Buttar (University of Glasgow (GB)) -
12:00 PM
Multiplicity dependent and inside-jet measurement of light neutral mesons in pp collisions with ALICE 15m
This talk presents the ALICE measurements of $\pi^{0}$, $\eta$, and $\omega$ meson production in pp collisions at 13 TeV. The results are given for several multiplicity classes, each for an unprecedented $p_{\rm T}$ coverage. Furthermore, the measurement of $\pi^{0}$ and $\eta$ mesons inside of jets will be shown.
ALICE measurements of neutral meson production in pp, p+Pb and Pb+Pb collisions give constraints to parton distribution functions (PDF) and FF, and provide essential background corrections for direct photon and dilepton analyses.
Observables previously attributed to the formation of a QGP in Pb–Pb have been measured in high-multiplicity pp and p–Pb collisions by ALICE and CMS, suggesting a continuous evolution from small to large collision systems. In addition, the correlation of neutral mesons and jets measured in pp collisions provides constraints on the meson FF.Speaker: Stephan Friedrich Stiefelmaier (Heidelberg University (DE)) -
12:15 PM
Jet substructure measurements at CMS 15m
Jet substructure measurements sensitive to the strong coupling are presented, namely the primary Lund jet plane and the energy-energy correlated. The measurements are motivated by their sensitivity to the strong coupling and present interesting experimental properties.
Speaker: Jindrich Lidrych (Universite Catholique de Louvain (UCL) (BE))
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10:45 AM
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10:45 AM
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12:30 PM
Top Quark and Electroweak Physics Club E
Club E
Conveners: Peter Berta (Charles University, Prague (CZ)), Dr Maria Moreno Llacer (Univ. of Valencia and CSIC (ES))-
10:45 AM
Recent results on inclusive and differential top-quark pair production from 5 to 13.6 TeV at CMS 18m
High precision measurements of top quark pair production are crucial to advance our understanding of perturbative and soft QCD and provide a deeper understanding of the partons inside the proton. In this talk, recent highlights of top quark cross-section measurements at CMS ranging from 5 TeV up to 13.6 TeV will be presented. Moreover, new results of differential cross-section measurements in challenging phase space will be discussed.
Speaker: Evan Altair Ranken (DESY) -
11:03 AM
Measurements of top quark production cross-sections with the ATLAS detector 18m
The LHC produces a vast sample of top quark pairs and single top quarks. Measurements of the inclusive top quark production rates at the LHC have reached a precision of several percent and test advanced Next-to-Next-to-Leading Order predictions in QCD. In this contribution, comprehensive measurements of top-quark-antiquark pair and single-top-quark production are presented that use data recorded by the ATLAS experiment in the Run 2 and Run 3 of the LHC . A recent result of the top-quark pair production in proton-lead collisions is also included.
Speaker: Marco Vanadia (Universita e INFN, Roma II (IT)) -
11:21 AM
Theoretical results for top-pair and top+W production 18m
I present theoretical results for top-pair production as well as for the associated production of top quarks with $W$ bosons. Soft-gluon corrections from resummation are calculated through approximate N$^3$LO and added to fixed-order QCD results, and electroweak corrections are included at NLO. Top-quark transverse-momentum and rapidity distributions are also presented. In all cases the higher-order corrections are large, they reduce the scale dependence, and they improve agreement with recent data.
Speaker: Nikolaos Kidonakis -
11:39 AM
LHC differential top-quark pair production cross sections in the ABMP16 PDF fit 18m
We investigate the impact of recent LHC measurements of differential top-quark pair production cross sections on the proton parton distribution functions (PDFs) using the ABMP16 methodology. The theoretical predictions are computed at NNLO QCD using the state-of-the-art MATRIX framework. The top-quark mass and strong coupling constants are free parameters of the fit, and we pay particular attention to the values of these parameters and their correlation as obtained from variants of the fit using different input data sets. We discuss the compatibility of different datasets and the compatibility of the fitted PDFs with those extracted from other datasets in the global ABMP16 fit, as well as with other modern global PDF sets. In addition, we compare the fit results with those obtained using the open-source xFitter framework.
Speaker: Oleksandr Zenaiev (Hamburg University) -
11:57 AM
Electroweak and associated top-quark production at CMS 15m
The high center-of-mass energy of the LHC opens the window to precise measurements of electroweak top quark production as well as vector boson and quark-associated production of top quark pairs and single top quarks. In this talk, recent inclusive and differential measurements of single-top and rare-top quark production will be discussed.
Speaker: Beatriz Ribeiro Lopes (CERN) -
12:12 PM
New Physics virtual correction to top-pair production 18m
Being the heaviest fermion and having a Yukawa interaction almost equal to one, the top-quark represents one of the most interesting portals to New Physics (NP). If it is light or belongs to a secluded sector, NP can be difficult to detect in colliders with traditional methods. An alternative way, at least for setting bounds, is studying the virtual corrections to SM processes. Kinematical distributions of top-quark pairs produced at the LHC are studied both by the CMS and ATLAS experiments. A plethora of data for both the threshold region and the tails of the distributions are already available. In addition, SM theoretical predictions are known at very high accuracy (NNLO QCD and beyond). In this talk I will discuss the effect of virtual corrections to top-pair production coming from different types of NP: Axion-Like-Particles, CP-even and CP-odd scalars. I will also discuss the opportunity that top-pair production opens to bound new-particle interactions or probe their existence.
Speaker: Simone Tentori (UCLouvain)
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10:45 AM
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Lunch
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4:15 PM
Accelerators: Physics, Performance, and R&D for future facilities Club D
Club D
Convener: Nicolas Mounet (CERN)-
2:30 PM
Status and prospects of the HL-LHC project 18m
The High-Luminosity LHC project aims to increase the integrated luminosity by an order of magnitude and enable its operation until the early 2040s. This presentation will give an overview of the current status of the project, for which several achievements can be reported, from the completion of the civil engineering to the successful demonstration of new key technologies such as the Nb3Sn magnets and MgB2 based sc links.
Preparing the LHC machine for a targeted integrated luminosity of 3000 fb-1 requires not only new, more radiation-tolerant and larger aperture triplet magnets but developments in several other key areas of accelerator technology, including crab-cavities, beam optics, collimation, beam instrumentation, magnet protection systems and high accuracy high current power converters. The HL-LHC project is therefore not only an upgrade of the LHC machine, but also a technology driver that develops technologies that will impact future accelerator projects like the FCC and EIC.Speaker: Hector Garcia Gavela (CERN) -
2:48 PM
HL-LHC Crab Cavities & Future Prospects 18m
In the High Luminosity Large Hadron Collider (HL-LHC) and most future colliders crab crossing is required to recuperate the significant geometric luminosity loss due to finite crossing angle at the collision point. In the framework of the HL-LHC, a decade long R&D program on ultra-compact superconducting crab cavities led to the successful demonstration of crabbing with high energy proton beams in the CERN SPS for the first time. This contribution will cover the main highlights of the development of superconducting crab cavities, including the global effort to realize the final crab cavity system for the HL-LHC. The implications of these developments on future colliders such as FCC and EIC will be discussed.
Speaker: Rama Calaga (CERN) -
3:06 PM
The electron cloud challenge for the HL-LHC 18m
The build-up of electron clouds in accelerator beam chambers can lead to detrimental effects, such as transverse instabilities, emittance growth, beam loss, vacuum degradation, and heat load. Such effects are systematically observed in the Large Hadron Collider (LHC) during operation with proton beams, limiting the total intensity achievable in the collider. The High Luminosity LHC (HL-LHC) project aims at an order of magnitude increase of the integrated luminosity of the LHC. With the associated increase in bunch intensity, as well as an observed increase in electron cloud effects after each long shutdown of the LHC, electron cloud poses a significant risk to the performance of the HL-LHC. In this contribution, we discuss the related limitations and proposed mitigation measures to ensure the best possible performance of the HL-LHC.
Speaker: Lotta Mether (CERN) -
3:24 PM
Present and future beam collimation: challenges and solutions for HL-LHC and future projects 18m
The HL-LHC performance relies on handling safely and reliably high intensity beams of unprecedented stored energy. The 7TeV design target is compatible a factor 2 larger current than the LHC and levelled peak luminosities 5 times, and ultimately 7.5 times, larger. This goal requires a massive collimation system upgrade, both for the halo betatron collimation that must sustain beam losses up to 1MW, and for the collimation systems around the experiments. This paper describes the solutions elaborated for HL-LHC and the operational experience from a first collimation upgrade deployed in the 2019-2021 long shutdown. These upgrades include new low-impedance collimators, crystal collimation for ion beams and local dispersion suppression collimation. The present and future collimator design are presented. This effort paves the way for beam collimation solutions that are being studies for future projects like the lepton and hadron future Circular Colliders (FCC) presently pursued at CERN.
Speaker: Dr Stefano Redaelli (CERN) -
3:42 PM
New baseline layout of the CERN Future Circular hadron-hadron Collider 15m
The ongoing feasibility study of the Future Circular Collider (FCC) comprises two distinct accelerators: a high-luminosity circular electron-positron collider known as FCC-ee and an energy-frontier hadron collider named FCC-hh. These two facilities are designed to take advantage of a common tunnel infrastructure. We present the new baseline design of FCC-hh, underlining the most recent updates. These include studies of the corrector systems, optimisation of the arc cell, increasing the dipole filling factor, and subsequent updates to the layouts of the different technical and experimental insertions.
Speaker: Gustavo Perez Segurana (CERN) -
3:57 PM
The High-Field Magnet Programme: Magnet R&D for FCC-hh in Europe 18m
Magnet technology is a key enabler for the Future Circular Collider (FCC) and its hadron collider variant (FCC-hh). The European High-Field Magnet Program (HFM), hosted at CERN, implements a European research network for high-field accelerator magnets that is geared towards FCC-hh. The research network includes four national laboratories and CERN for magnet design and construction, as well as institutes and universities for conductor research and other enabling technologies. In this contribution we present the status of the Programme, medium-term plans for technology demonstrations, as well as the strategy for integration and coordination with the FCC integrated program. The authors present in the name of the entire HFM Programme network.
Speaker: Bernhard Auchmann (PSI/CERN)
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2:30 PM
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4:12 PM
Beyond the Standard Model: Block 3 South Hall 1A
South Hall 1A
Conveners: Sezen Sekmen (Kyungpook National University (KR)), Tina Potter (University of Cambridge (GB))-
2:30 PM
Natural anomaly-mediation from the landscape with implications for LHC SUSY searches 17m
Supersymmetric models with the anomaly-mediated SUSY breaking (AMSB) have run into serious conflicts with 1. LHC sparticle and Higgs mass constraints, 2. constraints from wino-like WIMP dark matter searches and 3. bounds from naturalness. These conflicts may be avoided by introducing changes to the underlying phenomenological models providing a setting for natural anomaly-mediation (nAMSB). We examine spectra of nAMSB arising from string landscape. Here, we investigated LHC constraints on nAMSB models that allow m3/2 to lie within 90−200 TeV which may soon be discovered or falsified by a combination of 1. soft OS dilepton plus jet+ MET (OSDLJMET) searches which arise from higgsino pair production, 2. non-boosted hadronically decaying wino pair production searches and 3. same-sign diboson + MET searches arising from wino pair production followed by wino decay to W +higgsino. Some excess above SM background in the OSDLJMET channel already seems to be present in both ATLAS and CMS data.
Speaker: Dibyashree Sengupta -
2:47 PM
Searches for supersymmetry in non-minimal models 17m
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. With increasing mass bounds on MSSM scenarios other non-minimal variations of supersymmetry become increasingly interesting. This talk will present the latest results of searches conducted by the ATLAS experiment targeting strong and electroweak production in R-parity-violating models, as well as non-minimal-flavour-violating models
Speaker: Lauren Melissa Osojnak (University of Pennsylvania (US)) -
3:04 PM
Stealth and RPV SUSY searches with CMS 17m
Since the classic searches for supersymmetry under R-parity conserving scenarios have not given any strong indication for new physics yet, more and more supersymmetry searches are carried out on a wider range of supersymmetric scenarios. This talk focuses on searches looking for signatures of stealth and R-parity-violating supersymmetry. The results are based on proton-proton collisions recorded at sqrt(s) = 13 TeV with the CMS detector.
Speaker: Justin Anguiano (The University of Kansas (US)) -
3:21 PM
Search for electroweak supersymmetry with compressed spectra 17m
Supersymmetry (SUSY) models with featuring small mass splittings between one or more particles and the lightest neutralino could solve the hierarchy problem as well as offer a suitable dark matter candidate consistent with the observed thermal-relic dark matter density. However, the detection of SUSY higgsinos at the LHC remains challenging especially if their mass-splitting is O(1 GeV) or lower. Searches are developed using 140 fb^{-1} of proton-proton collision data collected by the ATLAS Detector at a center-of-mass energy \sqrt{s}=13 TeV to overcome the challenge. Novel techniques are developed exploiting machine-learning techniques, low-momentum tracks with large transverse impact parameters, or topologies consistent with VBF production of the supersymmetric particles. Results are interpreted in terms of SUSY simplified models and, for the first time since the LEP era, several gaps in different ranges of mass-splittings are excluded.
Speaker: Antonia Strubig (Stockholm University (SE)) -
3:38 PM
Recent searches for electroweak production of SUSY particles and third generation SUSY particles with CMS 17m
A wide variety of searches for Supersymmetry have been performed by experiments at the Large Hadron Collider. In this talk, we focus on searches for electroweak production of Supersymmetric particles as well as third generation Supersymmetric particles. Some analyses are optimized for Supersymmetric particles in compressed spectra. The results are obtained from the proton-proton collision data with luminosity up to 138 fb-1 at the center of mass energy of 13 TeV collected during the LHC Run 2.
Speaker: Margaret Rose Lazarovits (The University of Kansas (US))
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2:30 PM
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2:30 PM
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4:15 PM
Dark Matter Club A
Club A
Conveners: Dr Irene Bolognino (The University of Adelaide), Dr Martin Stahlberg (Max Planck Institute for Physics)-
2:30 PM
ANAIS-112 updated results on dark matter annual modulation 18m
The ANAIS experiment aims to independently verify or refute the longstanding positive annual modulation signal observed by DAMA/LIBRA using the same target and technique. While other experiments have ruled out the parameter region highlighted by DAMA/LIBRA, their results rely on assumptions on the dark matter particle and its velocity distribution, as they utilize different target materials. ANAIS−112, comprising nine 12.5 kg NaI(Tl) modules arranged in a 3×3 matrix configuration, has been continuously collecting data at the Canfranc Underground Laboratory in Spain since August 2017, demonstrating outstanding performance. Results based on three-year exposure were consistent with the absence of modulation and not compatible with DAMA/LIBRA at a sensitivity of almost 3σ confidence level. We will discuss the current state of the experiment and its most recent data analysis. Updated sensitivity projections will be provided, foreseeing a 5σ exclusion of the DAMA/LIBRA signal by late 2025.
Speaker: Maria Martinez -
2:48 PM
Status on COSINE-100 experiment 18m
The COSINE-100 experiment aims to detect dark matter-induced recoil interactions in NaI(Tl) crystals to test the DAMA/LIBRA collaboration's claim.
Data taking operated from September 2016 to March 2023 at the Yangyang underground laboratory in Korea, utilizing 106 kg of low-background NaI(Tl) detectors.
The COSINE-100 experimental setup was moved to a newly built underground laboratory, Yemilab. Here, we will proceed with the detector design upgrade to enhance light collection and operate the COSINE-100U experiment. Furthermore, the COSINE collaboration is in the process of developing a high-purity NaI(Tl) detector for the upcoming COSINE-200 experiment.
In this talk, we will report on the overall status and the latest outcomes of the dark matter search in COSINE-100. Additionally, we will provide an update on the status of COSINE-100 and discuss prospects for COSINE-200.
Speaker: Dr InSoo Lee (IBS) -
3:06 PM
The SABRE South Experiment at the Stawell Underground Physics Laboratory 17m
SABRE aims to provide a model independent test of the signal observed by DAMA/LIBRA through two separate detectors that rely on joint ultra-high NaI(Tl) purity crystal R&D activities: SABRE South at SUPL Australia and SABRE North at LNGS Italy. SABRE South is designed to disentangle seasonal/site-related effects from the dark matter-like modulated signal. Ultra-high purity crystals are immersed in a liquid scintillator veto, further surrounded by passive shielding and a plastic scintillator muon veto. Significant work has been undertaken to assess and mitigate background from the detector materials, and to understand the performance of both the crystal and veto systems. SUPL is a newly built facility located 1024 m underground in Australia. SABRE South is currently being assembled and will be completed in 2025, with first subsystems already installed in SUPL. This talk will report on the general status of the SABRE South assembly, its expected performance , and the design of SUPL.
Speaker: Lachlan Milligan -
3:23 PM
Status of SABRE North at LNGS and radiopurity of SABRE NaI(Tl) crystals 18m
SABRE aims to deploy arrays of ultra-low background NaI(Tl) crystals to carry out a model-independent search for dark matter through the annual modulation signature. SABRE will be a double-site experiment, made up of two separate detectors which rely on a joint crystal R&D activity, located in the North (LNGS) and Sout hemisphere (SUPL). SABRE has carried out, since more than 10 years, an extensive R&D on ultra radio-pure NaI(Tl) crystals. Several crystals have been grown and tested in active and passive shields at LNGS. Based on these results SABRE North is proceeding to a full scale design with purely passive shielding. To reach an unprecedented level of radiopurity for NaI(Tl) crystals, SABRE North is exploiting zone refining purification of the NaI powder prior to growth. We will present the first results from the zone refining activities and predictions on the ultimate radio purity achievable for the crystals. The status of SABRE North installation at LNGS will also be discussed.
Speaker: Gabriella Cataldi (INFN sez. Lecce) -
3:41 PM
Dark matter searches with the KM3NeT neutrino telescope 18m
Indirect dark matter detection experiments aim to observe the annihilation or decay products of dark matter. The flux of neutrinos produced by such processes in nearby dark matter containers, such as the Sun and the Galactic Centre, could be observed in neutrino telescopes. The KM3NeT observatory is composed of two undersea Čerenkov neutrino telescopes (KM3NeT-ORCA and ARCA) located offshore of France and Italy, respectively. In this work, searches for WIMP annihilations in the Galactic Centre and the Sun with KM3NeT are presented. An unbinned likelihood method is used to discriminate the signal originating from the Galactic Centre and the Sun from the background in the data samples of the first configurations of both detectors, ORCA6 and ARCA6/8/19/21. No significant excess over the expected background was found in either of the two analyses, resulting in limits on the velocity-averaged pair-annihilation cross section of WIMPs and the WIMP-nucleon scattering cross section.
Speaker: Mr Adrian Šaina (IFIC (CSIC - UV))
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Detectors for Future Facilities, R&D, Novel Techniques Club H
Club H
Conveners: Gabriella Gaudio (INFN-Pavia), Jana Faltova (Charles University (CZ))-
2:30 PM
STCF detector design and R&D progress 17m
The Super Tau-Charm Facility (STCF) is a high-luminosity electron-positron collider proposed in China. It will operate in an energy range of 2-7GeV with a peak luminosity higher than 0.5*10^35 cm^2 s^-1. The STCF physics goals require efficient and precise reconstruction of exclusive final states produced in the e+e- collisions. This places stringent demands on the performance of the STCF detector. It must provide maximal solid angle of coverage, high efficiency and good resolution for both charged and neutral particles of low momentum or energy, excellent hadron identification in a large momentum range, and powerful muon identification capability. The STCF detetor conceptual design has been published (available at arXiv:2303.15790). A full detector R&D program has been established and funded, and is going full steam ahead. This report presents the conceptual design and R&D progress of the STCF detector.
Speaker: Jianbei Liu (University of Science and Technology of China (CN)) -
2:47 PM
FORMOSA: looking forward to millicharged particles at the LHC 17m
The FORMOSA detector at the proposed Forward Physics Facility is a scintillator-based experiment designed to search for signatures of "millicharged particles" produced in the forward region of the LHC. This talk will cover the challenges and impressive sensitivity of the FORMOSA detector, expected to extend current limits by over an order of magnitude. A pathfinder experiment, the FORMOSA demonstrator, was installed in the FASER cavern at the LHC in early 2024 and has been collecting collisional data. Results from this demonstrator and important implications for the full detector design will be shown.
Speaker: Jacob Henry Steenis (University of California Davis (US)) -
3:04 PM
The Proton EDM 17m
A storage ring proton electric dipole moment (EDM) experiment (pEDM) would be the first direct search for a proton EDM and would improve on the current (indirect) limit by 5 orders of magnitude. It would surpass the current sensitivity (set by neutron EDM experiments) to QCD CP-violation by 3 orders of magnitude, making it potentially the most promising effort to solve the strong CP problem, and one of the most important probes for the existence of axions, CP-violation and the source of the universe’s matter-antimatter asymmetry. These, coupled with a new Physics reach of $\mathcal{O}(10^3)$ TeV and a construction cost of $\mathcal{O}$(£100M), makes it one of the low-cost/high-return proposals in particle physics today. The experiment will build upon the highly successful techniques of the Muon g-2 Experiment at Fermilab and, in this talk, I will motivate and describe the pEDM experiment, and detail its path to success by building upon previous recent achievements.
Speaker: Alex Keshavarzi (University of Manchester) -
3:21 PM
A detector for future DIS at the energy frontier 17m
The proposed LHeC and the FCC in electron-hadron mode will make possible the study of DIS in the TeV regime. These facilities will provide electron-proton (nucleus) collisions with per nucleon instantaneous luminosities around $10^{34}$($10^{33}$) cm$^{−2}$s$^{−1}$ by colliding a 50-60 GeV electron beam from a highly innovative energy-recovery linac system with the LHC/FCC hadron beams, concurrently with other experiments for hadron-hadron collisions. The detector design was updated in the 2020 CDR. Ongoing developments since then include an improved IR design together with a more detailed study of an all-silicon central tracking detector. Additional capabilities for PID, enabling improved semi-inclusive DIS and eA studies, are also under study. In this talk, we describe the current detector design and ongoing discussion in the framework of a new ep/eA study, highlighting areas of common interest with other future collider experiments and the new Detector R&D Collaborations in Europe.
Speaker: Laurent Forthomme (AGH University of Krakow (PL)) -
3:38 PM
SUB-Millicharge ExperimenT (SUBMET) at J-PARC 17m
SUB-Millicharge ExperimenT (SUBMET) searches for sub-millicharged particles from the proton fixed-target collisions at J-PARC. The detector, installed 280 m from the target, is composed of two layers of stacked scintillator bars and PMTs. The main background is expected to be a random coincidence between the two layers due to dark counts in PMTs and the radiation from the surrounding materials, which can be reduced significantly using the timing of the proton beam. With $\rm{N}_{\rm{POT}}=5\times 10^{21}$, the experiment provides sensitivity to $\chi$s with the charge down to $8\times 10^{−5}𝑒$ in $𝑚_\chi<0.2$ GeV/$\rm{c}^2$ and $10^{−3}𝑒$ in $𝑚_\chi>1.6$ GeV/$\rm{c}^2$. This is the regime largely uncovered by the previous experiments. This talk will address the assembly, construction, and installation of the detector as well as the future outlook of the experiment
Speaker: Jae Hyeok Yoo (Korea University (KR)) -
3:55 PM
COmpact DEtector for EXotics at LHCb: CODEX-b 17m
The COmpact DEtector for EXotics at LHCb (CODEX-b) is a particle physics detector dedicated to displaced decays of exotic long-lived particles (LLPs), compelling signatures of dark sectors Beyond the Standard Model, which arise in theories containing a hierarchy of scales and small parameters. CODEX-b is planned to be installed near the LHCb interaction point and makes use of fast RPCs, which provide both a good space and temporal sensitivity and also a zero background environment, hence complementing the new-searches program of other detectors like ATLAS or CMS. A demonstrator detector, CODEX-beta, is being assembled now to take data beginning in the second half of 2024 and 2025. It will validate the design and physics case for the future CODEX-b. CODEX-beta will be responsible for validating the background estimations for CODEX-b, demonstrating the seamless integration in the LHCb readout system, and showing the suitability of the baseline tracking and its mechanical support.
Speaker: Emilio Rodriguez Fernandez (Universidade de Santiago de Compostela (ES))
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Education and Outreach South Hall 2B
South Hall 2B
Conveners: Connie Potter (CERN), David Barney (CERN), Miroslav Myska (Czech Technical University in Prague (CZ))-
2:30 PM
Crowd-sourced particle physics stories from DESY-CMS 15m
The CMS at DESY outreach Instagram account provides science communication and outreach for a large experimental particle physics group. It aims to promote science, engage young scientists in outreach and showcase their work. The Instagram platform was selected for its demographic alignment with the target stakeholders and broad user base in Germany and abroad.
The communication focuses on highlighting young scientists, offering insights into the scientific journey, and sharing particle physics outreach content. Multiple contributors collaborate on the content, fostering training opportunities in science communication at a manageable time investment for early career researchers. This talk will cover the project's evolution, initial objectives, target audiences, and experiences in content creation and engagement on social media.
Speaker: Lucia Ximena Coll Saravia (Deutsches Elektronen-Synchrotron (DE)) -
2:45 PM
The new digital landscape: perspectives from CERN 15m
In 2021, CERN’s social media audience was not growing. The Organization’s follower-base grew to 4.73Mtoday; its social media presence grew by 16% in reach (292M impressions) and 22% in engagement (11.2M reactions) despite the increasingly competitive and ever-evolving digital landscape. We review CERN’s main social media activities-content creation, digital partnerships, and community engagement-and present our learnings about how we managed to break this plateau. We will focus on how we worked to align our activities with other communications and outreach teams at CERN, to build our digital networks, and to engage the many different actors of the digital landscape. We will examine our monitoring, measurement, and evaluation activities and how we conduct the analyses described above, also addressing the increasing mistrust in organisations and polarisation of the digital landscape. We will share our perspective about what comes next, both for CERN and for the broad digital landscape.
Speaker: Daniela Antonio (CERN) -
3:00 PM
Physics Beyond Colliders Communications Strategy 15m
Launched in 2016 and confirmed by the Update of the European Strategy of Particle Physics, the Physics Beyond Colliders Initiative aims to exploit the scientific potential of CERN's accelerator complex and technical infrastructure, as well as its expertise in accelerator and detector science and technology. The diverse PBC projects, ranging from QCD to BSM searches and, in particular, searches for feebly interacting particles, complement the goals of the Laboratory’s main collider experiments by targeting fundamental physics questions. Flagship projects emerging from PBC include the NA64 experiment, which is searching for light dark matter, and the ECN3 high-intensity facility in CERN’s North Area.
This presentation will highlight the new communications strategy that supports both the PBC Initiative’s general outreach and will also discuss a few use cases of how this strategy supports specific projects that need to increase their global visibility.
Speaker: Kristiane Bernhard-Novotny (CERN) -
3:15 PM
Engaging Young Minds with Particle Physics 15m
We use particle physics as a prime example to engage young students to get involved in this subject area and gain a new, everyday perspective on STEM topics. Our strategy is designed to demystify physics, making it more accessible and attractive early in school.
In Germany, students usually decide whether or not to continue physics education around the age of 15. That's why our project is aimed specifically at students aged 10 to 15 to give them a real insight into particle physics research. Our efforts have focused on creating educational and engaging workshops for young learners. We have reached over 620 students across these age groups through more than 25 interventions in the last two years. The initial results are promising, indicating that our efforts are successfully igniting a motivation for physics, especially among girls. We aim to inspire the next generation of (particle) physicists. In this talk, we will present our workshops, the methodologies we use and initial data.Speaker: David Borgelt (Universität Münster (DE)) -
3:30 PM
European Researchers’ Night: the INFN experience in Italy 15m
The European Researchers’ Night stands as a beacon of scientific outreach and engagement. It unfolds as a platform for dialogue, enabling researchers to share their passion and latest breakthroughs with a diverse audience. In this talk, we delve into the journey of the Italian National Institute for Nuclear Physics (INFN) within this prestigious event. The INFN obtained so far a large number of financed projects and this contributed to the diffusion of the initiative throughout the national territory. With a focus on fostering the interaction between researchers and the public, our participation offers a kaleidoscope of engaging activities and enlightening discussions. Through interactive exhibits and hands-on experiments, the INFN showcases the intricacies of particle physics, inviting attendees to embark on a journey of scientific discovery. We describe our experience by including suggestions for improving the success of involvement in Reseachers' Night also in other countries.
Speaker: Livia Soffi (INFN Roma I (IT)) -
3:45 PM
The First Release of ATLAS Open Data for Research 15m
The ATLAS Collaboration has recently, for the first time, released a large volume of data for use in research publications. The entire 2015 and 2016 proton collision dataset has been made public, along with a large quantity of matching simulated data, in a light format, PHYSLITE, which is also used internally for ATLAS analysis. In order to allow detailed analyses of these data, all the corresponding software has been made public, along with extensive documentation targeting several different levels of users, from those who are new to particle physics to experienced researchers that need only an introduction to the ATLAS-specific details of the data. This contribution describes the data, the corresponding metadata and software, and the documentation of the open data, along with the first interactions with non-ATLAS researchers.
Speaker: Mariana Isabel Vivas Albornoz (University of Massachusetts (US)) -
4:00 PM
Open discussion 15m
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Higgs Physics South Hall 2A
South Hall 2A
Conveners: Daniel De Florian (Laboratorio de Fisica Teorica Departamento de Fisica), Katharine Leney (Southern Methodist University (US))-
2:30 PM
Probing the nature of electroweak symmetry breaking with Higgs boson pairs in ATLAS 17m
In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. The Standard Model makes a definite prediction for the Higgs boson self-coupling and thereby the shape of the Higgs potential. Experimentally, both can be probed through the production of Higgs boson pairs (HH), a rare process that presently receives a lot of attention at the LHC. In this talk, the latest non-resonant HH searches by the ATLAS experiment are reported. Results are interpreted both in terms of sensitivity to the Standard Model and as limits on the Higgs boson self-coupling. A combined measurement of single and double Higgs production results are presented based on pp collision data collected at a centre-of-mass energy of 13 TeV with the ATLAS detector.
Speaker: Dilia Maria Portillo Quintero (TRIUMF (CA)) -
2:47 PM
Di-Higgs searches at CMS 17m
The measurement of the production of Higgs boson pairs (HH) at the LHC allows the exploration of the Higgs boson interaction with itself and is thus a fundamental test of the Standard Model theory and has a key role in the determination of the Higgs boson nature. The most recent results from the CMS collaboration on measurements of non-resonant HH production using different final states and their combination using the data set collected by the CMS experiment at a centre of mass energy of 13 TeV will be presented.
Speaker: Cristina Ana Mantilla Suarez (Fermi National Accelerator Lab. (US)) -
3:04 PM
Analytic electroweak corrections to gluon-fusion di-Higgs and Higgs plus jet production 17m
We consider next-to-leading order electroweak corrections to Higgs boson pair production and to Higgs plus jet production in gluon fusion. This requires the computation of two-loop four-point amplitudes with massive internal particles such as top quarks, Higgs and gauge bosons. We perform analytic calculations in various kinematical limits and show that their combination covers the whole phase space, thus circumventing time-consuming numerical approaches.
Speaker: Hantian Zhang (Karlsruhe Institute of Technology) -
3:21 PM
Taming a leading theoretical uncertainty in $HH$ measurements via accurate simulation for $bbH$ production 17m
We present a new simulation for Higgs boson production in association with bottom quarks ($bbH$) at next-to-leading order (NLO) matched to parton showers. The contributions proportional to the bottom-quark Yukawa coupling and top-quark Yukawa coupling (from gluon fusion) are both taken into account in a scheme with massive bottom quarks. The $bbH$ process constitutes a crucial background to measurements of Higgs-boson pair ($HH$) production at the LHC when at least one of the Higgs bosons decays to bottom quarks. So far, the modeling of $bbH$ induced one of the dominant theoretical uncertainties to $HH$ measurements, as the gluon-fusion component was described only at the leading order with uncertainties of O(100%). Including NLO corrections allows to reduce the scale dependence to O(50%). We provide an in-depth analysis of the $bbH$ background to $HH$ measurements, and we propagate the effect of the new $bbH$ simulation to $HH$ searches in the $2b2\gamma$ and $2b2\tau$ final states.
Speaker: Elena Mazzeo (Università degli Studi e INFN Milano (IT)) -
3:38 PM
Towards NNLO QCD corrections to Higgs boson pair production 17m
Higgs boson pair production plays an important role in the determination of the Higgs boson self coupling, a major element in the LHC physics program. The predictions based on next-to-leading order corrections show a large dependence on the renormalization scheme of the top quark mass, which requires a next-to-next-to-leading order calculation. We show first results of the three-loop virtual corrections, expanded around the forward-scattering kinematics, which covers a large p$the phase space.
Speaker: Matthias Steinhauser -
3:55 PM
Sensitivity to New Physics in final states with multiple gauge and Higgs bosons 17m
We analyse the sensitivity to beyond-the-Standard-Model effects of hadron-collider processes involving the interaction of two electroweak (V) and two Higgs (H) bosons, VVHH, with V being either a W or a Z boson.
We examine current experimental results by the CMS collaboration in the context of a dimension-8 extension of the Standard Model in an effective-field-theory formalism. We show that constraints from vector-boson-fusion Higgs-pair production on operators that modify the Standard Model VVHH interactions are already comparable with or more stringent than those quoted in the analysis of vector-boson-scattering final states. We study the modifications of such constraints when introducing unitarity bounds, and investigate the potential of new experimental final states, such as ZHH associated production. Finally, we show perspectives for the high-luminosity phase of the LHC.Speaker: Alessandra Cappati (Centre National de la Recherche Scientifique (FR))
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Neutrino Physics: Oscillations and Interactions Panorama
Panorama
Convener: Tomas Nosek (Charles University, Institute of Particle and Nuclear Physics)-
2:30 PM
The Deep Underground Neutrino Experiment (DUNE) Program 15m
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino oscillation experiment aimed at determining the neutrino mass hierarchy and the CP-violating phase. The DUNE physics program also includes the detection of astrophysical neutrinos and the search for signatures beyond the Standard Model, such as nucleon decays. DUNE consists of a near detector complex located at Fermilab and four 17-kton Liquid Argon Time Projection Chamber (LArTPC) far detector modules to be built 1.5 km underground at SURF, approximately 1300 km away. The detectors are exposed to a wideband neutrino beam generated by a 1.2 MW proton beam with a planned upgrade to 2.4 MW. Two 700 ton LArTPCs (ProtoDUNEs) have been operated at CERN for over 2 years as a testbed for DUNE far detectors and have been optimized to take new cosmic and test-beam data in 2024-2025. This talk will present the DUNE and ProtoDUNE experiments and physics goals, as well as recent progress and results.
Speaker: Ines Gil Botella (CIEMAT) -
2:45 PM
The IceCube Upgrade: status and prospects for new advances with GeV neutrinos 15m
The IceCube Neutrino Observatory is a cubic kilometer detector in the ice of the South Pole for the detection of neutrinos with energies from GeV to PeV, which has been fully in operation since 2010. In the 2025/2026 Antarctic summer season, the detector will receive a low-energy upgrade by adding about 700 new optical modules. Several new digital optical modules with multiple PMTs and calibration devices will be deployed in a high-density configuration in the center of the IceCube array. The Upgrade will improve the detection of GeV-scale neutrinos which in turn will lead to more precise measurements of fundamental physics phenomena such as neutrino oscillations and beyond the Standard Model physics. This talk will give an overview of the new designs and the status of their testing, the planned installation and also discuss the prospects for the exciting measurements to be expected with the Upgrade.
Speaker: Nora Feigl -
3:00 PM
Exploring tau neutrino appearance measurements in KM3NeT/ORCA 15m
Next-generation experiments aim at ensuring high-precision measurements of the oscillation parameters to reveal the main unknowns in neutrino physics. Among them, validating the three-flavors paradigm remains one of the most stimulating because it allows for exploring new physics.
KM3NeT/ORCA is a water Cherenkov neutrino telescope, under construction in the Mediterranean Sea, whose primary physics goal is an early measurement of the neutrino mass ordering from the oscillation of atmospheric neutrinos traversing the Earth. Thanks to its huge fiducial mass, KM3NeT/ORCA will have unprecedented statistics to exploit the tau neutrino appearance channels as an indirect test of the PMNS matrix unitarity and, thus, of the three-neutrino flavors paradigm. With a focus on the event reconstruction and selection methods, the results from the first blind measurement of the tau neutrino normalization performed by exploiting data collected with a partially instrumented volume will be presented.
Speaker: Dr Chiara F Lastoria (LPC Caen, CNRS/IN2P3, Caen (France)) -
3:15 PM
Measurement of atmospheric neutrino oscillations with KM3NeT/ORCA 15m
KM3NeT/ORCA is a water-Cherenkov neutrino telescope currently under construction in the Mediterranean sea, with the goal of measuring atmospheric neutrino oscillations and determining the neutrino mass ordering. The detector is located 40 km off-shore Toulon, France, and consists of a three-dimensional grid of detection units equipped with 18 digital optical modules, hosting 31 photo-multiplier tubes each. By inspecting the arrival direction of GeV-neutrinos crossing the Earth, ORCA can effectively constrain the oscillation parameters $\Delta m^{2}_{31}$ and $\theta_{23}$, and can additionally be used to search for deviations from the Standard Model in neutrino interactions, the so-called Non-Standard neutrino Interactions (NSI).
This presentation covers the most up-to-date results from the ORCA detector on neutrino oscillations and NSI, which improve on previous ORCA measurements and benefit from increased exposure, refined event selections and optimised reconstruction algorithms.Speaker: Alfonso Lazo Pedrajas (IFIC-Universitat de València) -
3:30 PM
Enhanced search for CP violation in leptons with the new intermediate water cherenkov detector and improved J-PARC neutrino beam in the Hyper-Kamiokande Experiment. 15m
The Hyper-Kamiokande experiment aims to discover the CP violation in
leptons by the precise measurement of $ \nu_{\mu} \to \nu_{e}$ and
$\bar{\nu}_{\mu}\to\bar{\nu}_{e}$ oscillations. It will be realized
by high statistics using the new 260 kiloton far-detector and the
intense neutrino beam from J-PARC, and by precise understand on the
neutrino-nucleus interaction using the new intermediate water
Cherenkov detector (IWCD). The J-PARC accelerator and neutrino beam
facility is being improved for 1.3MW beam power from the original
design value of 750kW, and the new experimental facility for IWCD will
be constructed at the new site away from ~900m from the neutrino
production target. The role and prospects of IWCD measurements, the
IWCD facility design, and the latest progress of the upgrade of J-PARC
and the IWCD project that are started in 2020 towards the data taking
start in 2027 are described.Speaker: Takeshi Nakadaira (High Energy Accelerator Research Organization (JP)) -
3:45 PM
Low-ν: a tale of two energies 15m
It was the best of methods, it was the worst of methods... This talk will introduce and discuss the low-ν method for constraining the neutrino flux shape by isolating neutrino interactions with low energy transfer to the nucleus in two different contexts. Firstly, at few-GeV accelerator neutrino energies relevant for precision oscillation experiments where the method is well known, but we find that model-dependence limits its utility for the precision era. Secondly, at the TeV neutrino energies relevant for planned searches at the Forward Physics Facility, using neutrino produced in LHC collisions. We show that the low-nu method would be effective for extracting the muon-neutrino flux shape at the FPF, in a model-independent way, for a variety of detector options, and that the precision would be sufficient to discriminate between various realistic flux models.
Speaker: Callum David Wilkinson (Lawrence Berkeley National Lab. (US)) -
4:00 PM
Quasielastic Lepton-Nucleus Scattering and the Correlated Fermi Gas Model 15m
The neutrino research program in the coming decades will require improved precision. A major source of uncertainty is the interaction of neutrinos with nuclei that serve as a target of many such experiments. Broadly speaking, this interaction often depends, e.g., for Charge-Current Quasi-Elastic (CCQE) scattering, on the combination of “nucleon physics” expressed by form factors and “nuclear physics” expressed by a nuclear model. It is important to get a good handle on both.
This talk presents a fully analytic implementation of the Correlated Fermi Gas (CFG) Model for CCQE electron-nuclei and neutrino-nuclei scattering. The implementation is used to compare separately form factors and nuclear model effects for both electron-carbon and neutrino-carbon scattering data.
Speaker: Prof. Gil Paz (Wayne State University)
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Operation, Performance and Upgrade (incl. HL-LHC) of Present Detectors: Operation, Performance and Upgrade of Present Detectors Terrace 2B
Terrace 2B
Conveners: Silvia Franchino (Heidelberg University (DE)), Marcela Mikestikova (Czech Academy of Sciences (CZ))-
2:30 PM
Expected performance of the ATLAS ITk detector for HL-LHC 18m
The increased instantaneous luminosity levels expected to be delivered by the High-Luminosity LHC (HL-LHC) will present new challenges to High-Energy Physics experiments, both in terms of detector technologies and software capabilities. The current ATLAS inner detector will be unable to cope with an average number of 200 simultaneous proton-proton interactions resulting from HL-LHC collisions. As such, the ATLAS collaboration is carrying out an upgrade campaign, known as Phase-II upgrade, that foresees the installation of a new all-silicon tracking detector, the Inner Tracker (ITk), designed for the expected occupancy and fluence of charged particles. The new detector will provide a wider pseudorapidity coverage and an increased granularity. In this contribution the expected performance of the ITk detector will be presented, with emphasis on the improvements on track reconstruction resulting from the new detector design.
Speaker: Helen Hayward (University of Liverpool (GB)) -
2:48 PM
The LHCb VELO detector: operation, performance and future upgrades 18m
The VELO is the detector surrounding the interaction region of the LHCb experiment, responsible of reconstructing the proton-proton collision as well as the decay vertices of long-lived particles. It consists of 52 modules with hybrid pixel technology, with the first sensitive pixel being at 5.1 mm from the beam line. It operates in an extreme environment, which poses significant challenges to its operation. The detector performance in the first two years of operation will be presented.
In order to fully exploit the High-Luminosity LHC potential in flavour physics, a Phase-II Upgrade of the detector is proposed. Due to the extreme environment of HL-LHC, the design of the upgraded detector is particularly challenging: assuming the same hybrid pixel design and detector geometry, the front-end electronics of the VELO Upgrade-II will have to cope with rates as high as 8 Ghits/s, with the hottest pixels reaching up to 500 khits/s. The status of the Upgrade-II project will be discussed.Speaker: Maria Domenica Galati (Van Swinderen Institute, University of Groningen) -
3:06 PM
Commissioning of the Upstream Tracker for the LHCb upgrade 15m
The LHCb detector has undergone a major upgrade, enabling the experiment to acquire data with an all software trigger, made possible by front-end readout in real-time and fast and efficient online reconstruction. At the heart of the real-time analysis is a fast and efficient track reconstruction, without spurious tracks composed of segments associated with hits from different charged particles. The Upstream Tracker (UT), a 4-plane silicon microstrip detector in front of the dipole magnet, is crucial to the charged particle trajectory reconstruction. The UT also aids the reconstruction of long-lived particles. The UT was installed in LHCb in early 2023. The first year of commissioning was challenging for data synchronization issues related to the GBTx properties. We report the lessons learned during the early commissioning phase and the upcoming run when the UT performance with beams will be studied.
Speaker: Marina Artuso (Syracuse University (US)) -
3:21 PM
Re-installation and performance of the Belle II Silicon Vertex Detector 18m
At the beginning of 2024 data taking of the Belle II experiment resumed after the Long Shutdown 1, primarily required to install a new two-layer DEPFET detector (PXD) and upgrade accelerator components. The whole silicon tracker (VXD) was extracted, the two halves of the outer strip detector (SVD) were split for the PXD insertion and reconnected again. The new VXD was commissioned for the start of the new run.
We will describe the challenges of this VXD upgrade and report on the operational experience and the SVD performance obtained with this first-year data. We then introduce the various improvements in the reconstruction procedure, that exploit the excellent SVD hit-time resolution to enhance beam-induced background rejection and reduce track fake-rate, crucial aspects for the higher luminosity regime.Speaker: Luigi Corona -
3:39 PM
The silicon tracking system of the future ALICE 3 experiment at the LHC 18m
ALICE 3 is the next generation heavy-ion experiment proposed for the LHC Runs 5-6. Its tracking system includes a vertex detector, on a retractable structure inside the beam pipe to achieve a pointing resolution of better than 10 microns for $p_{\rm T}$>200 MeV/c, and a large-area tracker covering 8 units of pseudorapidity (|$\eta$|<4). The tracking system will be based on Monolithic Active Pixel Sensor (MAPS) technology.
An intensive R&D program has started, to meet the challenging detector requirements: the innermost vertex detector layer, placed at 5 mm from the interaction point, must withstand an integrated radiation load of 9x10$^{15}$ 1 MeV neq/cm$^2$ NIEL; the tracker will cover 50 m$^2$, extending to a radius of 0.8 m and a total longitudinal length of 8 m.
This contribution will discuss the detector requirements and target sensor specifications, the ideas for mechanics and integration, and the R&D challenges expected for the implementation of the ALICE 3 tracking system.Speaker: Igor Altsybeev (Technische Universitaet Muenchen (DE)) -
3:57 PM
Upgrade of the Belle II Vertex Detector with monolithic active pixel sensors 15m
The Belle II experiment considers upgrading its vertex detector with new pixel sensors to prepare for the target luminosity of 6 10^35 cm-2 s-1. The 5 layers of the new VTX detector are equipped with the same depleted monolithic active CMOS pixel sensor, featuring a 33 µm pitch, a 100 ns integration time and a trigger logic matching 30 kHz average rate and 10 µs trigger latency for a maximum hit rate of 120 MHz/cm2.
The two innermost layers are based on an all-silicon ladder concept with air cooling, aiming for a material budget below 0.2 % X0/layer. The three outer layers follow a more traditional approach still targeting aggressive material budget, from 0.3 % to 0.8 % X0 depending on the radius.
The VTX could be the first MAPS-based vertex detector running at an e+e- collider, facing high rate and featuring low mass. This contribution will overview the VTX concepts, detail critical aspects, and discuss the various tests on-going with prototypes to validate the technical choices.Speaker: Ajit Kumar (IPHC Strasbourg)
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Quark and Lepton Flavour Physics South Hall 1B
South Hall 1B
Conveners: Weimin Song (Jilin University College of Physics (CN)), Tomas Jakoubek (Weizmann Institute of Science (IL))-
2:30 PM
Status of the muEDM experiment at PSI 15m
Explaining the matter-antimatter asymmetry in the Universe requires new sources of CP violation beyond the predictions of the Standard Model (SM). Electric dipole moments (EDMs) of particles, being zero if CP is exactly conserved and extremely small in the SM, are a very clean and sensitive probe for new physics. We will present the status of the muEDM experiment, a search for a muon EDM at PSI (CH) pioneering the frozen spin technique. Muons will be stored in a solenoid, with a radial electric field tuned to eliminate the spin precession generated by the magnetic moment. Measuring a residual, longitudinal precession would indicate a non-zero EDM. The first phase of the experiment will demonstrate, by 2026, the feasibility and unique potential of the technique, while reaching a sensitivity competitive with the parasitic measurements performed in the muon g-2 experiments. The ultimate goal of the muEDM experiment is to improve this sensitivity by a factor of 100 by the early 2030s.
Speaker: Francesco Renga (INFN Roma) -
2:45 PM
In search of New Physics with Lepton Flavor Violation in Υ(3S)→e±μ∓ 15m
Although unobservable in the standard model, charged lepton flavour violating (LVF) processes are predicted to be enhanced in new physics extensions. We present the final results of a search for electron-muon flavour violation in 𝛶(3S) → e±μ∓ decays using data collected with the BaBar detector at the SLAC PEP-II e+e− collider operating with a 10.36 GeV centre-of-mass energy. The search was conducted using a data sample of 118 million 𝛶(3S) mesons from 27 fb−1 of data and is the first search for electron-muon LFV decays of a b quark and b antiquark bound state. No evidence for a signal is found, and we set a limit on the branching fraction of 𝛶(3S) → e±μ∓ and interpret it as a limit on the energy scale divided by the coupling-squared of relevant LFV new physics (NP): ΛNP/gNP2 > 80 TeV.
Speaker: Nafisa Tasneem (St. Francis Xavier University) -
3:00 PM
Searches for lepton-flavour violation in $\tau$ decays at Belle and Belle$~$II 15m
The Belle and Belle$~$II experiments have collected a $1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. This sample contains approximately 1.3 billion $e^+e^-\to \tau^+\tau^{-}$ events, which we use to search for lepton-flavour violating decays. We present searches for tau decay to three charged leptons, $\tau^-\to K_{\rm S}^0\ell^{-}$, $\tau^-\to\Lambda\pi^-$, $\tau^-\to \bar{\Lambda}\pi^-$ and $\tau^-\to \ell^-\alpha$, where $\alpha$ is an invisible scalar particle.
Speaker: Wenzhe Li (Beihang University (CN)) -
3:15 PM
Precision measurements of $\tau$ lepton decays at Belle$~$II 15m
The Belle$~$II experiment has collected a $424~\mathrm{fb}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. This sample contains 389 million $e^+e^-\to \tau^+\tau^{-}$ events, which we use for precision tests of the standard model. We present measurements of leptonic branching fractions, lepton-flavour universality between electrons and muons, the tau mass and the Cabibbo-Kobayashi-Maskawa matrix element $V_{us}$.
Speaker: Gianluca Inguglia (Austrian Academy of Sciences (AT)) -
3:30 PM
Heavy flavor studies at ILC 15m
The International Linear Collider (ILC) offers favorable low-background
environment as well as the high energy reach to measure properties of heavy
quarks and the top-quark in particular. As these particles are likely messengers of
new physics, precision measurements of their properties can be interpreted in the
context of search for beyond-the-Standard-Model (BSM) realizations. The latest
results from ILC studies will be discussed in this respect.Speaker: Andrej Saibel (Univ. of Valencia and CSIC (ES)) -
3:45 PM
Flavour and tau physics at FCC-ee 15m
The unparalleled production of beauty and charm hadrons and tau's in the $6\cdot 10^{12}$ Z boson decays expected at FCC-ee offers outstanding opportunities in flavour physics. A wide range of measurements will be possible in heavy-flavour spectroscopy, rare decays and CP violation, benefitting from a low-background environment, initial-state energy-momentum constraints, high Lorentz boost, and availability of the full hadron spectrum. The huge data sample offers also improved determinations of tau properties (lifetime, leptonic/hadronic widths, mass) allowing for key tests of lepton universality. Via the measurement of the tau polarisation, the partial width and forward-backward asymmetries of heavy quarks, FCC-ee can precisely determine the neutral-current couplings of e$^\pm$, taus and heavy quarks. Such measurements present strong challenges to match the $O(10^{-5})$ stat uncertainties, raising strict detector requirements and novel experimental methods to limit systematic effects.
Speaker: Aidan Richard Wiederhold (University of Warwick (GB)) -
4:00 PM
Status of Chiral Belle: The Beam Polarization Upgrade of SuperKEKB 15m
Recent R&D work associated with upgrading the SuperKEKB $e^+e^−$ collider with polarized electron beams and Chiral Belle’s program of unique precision measurements using Belle II will be described. These include five values of $\sin^2\theta_W$ via left-right asymmetry measurements ($A_{LR}$) in $e^+e^- \rightarrow e^+e^-, \mu^+\mu^-, \tau^+\tau^-, c\bar{c},b\bar{b}$. $A_{LR}$ yields values of the neutral current (NC) coupling constant of each fermion species that will match (e,$\tau$) or greatly exceed (b, c, $\mu$) existing $Z^0$ world averages precision, but at 10GeV, thereby providing unique probes the running of $\theta_W$. The program also probes new physics via the highest precision measurements by many factors of NC universality and tau lepton properties, including the tau g-2. After providing an update on Chiral Belle's physics potential, we will report on recent R&D related to provision of the required hardware, including modest upgrades to the SuperKEKB electron ring.
Speaker: Prof. Michael Roney (Univesity of Victoria)
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Strong interactions and Hadron Physics North Hall
North Hall
Conveners: Katerina Lipka (Deutsches Elektronen-Synchrotron (DE)), Josu Cantero (IFIC/UV-CSIC (ES))-
2:30 PM
Determination of the strong-coupling constant from the Z-boson transverse-momentum distribution 15m
The coupling constant of the strong force is determined from the transverse-momentum distribution of Z bosons produced in 8 TeV proton-proton collisions. The Z-boson cross sections are measured in the full phase space of the decay leptons. The analysis is based on predictions evaluated at third order in perturbative QCD, supplemented by the resummation of logarithmically enhanced contributions in the low transverse-momentum region of the lepton pairs.
Speaker: Kristof Schmieden (Johannes Gutenberg Universitaet Mainz (DE)) -
2:45 PM
Measurement of jet production in deep inelastic scattering and NNLO determination of the strong coupling at ZEUS 15m
A new measurement of inclusive-jet cross sections in the Breit frame in neutral current deep inelastic scattering using the ZEUS detector at the HERA collider is presented. The data were taken at a centre-of-mass energy of 318 GeV and correspond to an integrated luminosity of 347 pb-1. Massless jets, reconstructed using the kt-algorithm in the Breit reference frame, have been measured as a function of the squared momentum transfer, and the transverse momentum of the jets in the Breit frame. The measurement has been used in a next-to-next-to-leading-order QCD analysis to perform a simultaneous determination of parton distribution functions of the proton and the strong coupling, resulting in a value of $\alpha_s(M^2_Z) = 0.1142 \pm 0.0017$ (exp/fit)$^{+0.0006}_{−0.0007}$ (model/param) $^{+0.0006}_{−0.0004 (scale)}$, whose accuracy is improved compared to similar measurements. In addition, the running of the strong coupling is demonstrated using data obtained at different scales.
Speaker: Florian Lorkowski (University of Zürich) -
3:00 PM
Precision measurements of multijet production with the ATLAS experiment 15m
The production of jets at hadron colliders provides stringent tests of perturbative QCD. The latest measurements by the ATLAS experiment are presented in this talk, using multijet events produced in the proton-proton collision data at sqrt(s) = 13 TeV delivered by the LHC. Jet cross-section ratios between inclusive bins of jet multiplicity are measured differentially in variables that are sensitive to either the energy-scale or angular distribution of hadronic energy flow in the final state. Several improvements to the jet energy scale uncertainties are described, which result in significant improvements of the overall ATLAS jet energy scale uncertainty. The measurements are compared to state-of-the-art NLO and NNLO predictions, and used to determine the strong-coupling constant. A measurement of new event-shape jet observables defined in terms of reference geometries with cylindrical and circular symmetries using the energy mover???s distance is highlighted.
Speaker: Stanislav Polacek (Charles University (CZ)) -
3:15 PM
Alpha-s and jet measurements in CMS 15m
A vast program of measurements of the strong coupling constant alpha_S is being undertaken by CMS. These measurements exploit several QCD dominated processes that are sensitive to alpha_S, and present different theoretical and experimental challenges. A review of the current public results and perspective is given.
Speaker: Patrick Connor (University Hamburg (DE)) -
3:30 PM
Determination of alphaS from differential cross-sections and azimuthal correlations among jets at CMS 15m
The jet cross sections and azimuthal correlations among jets with large transverse momentum at CMS are measured, the results were compared to theory predictions, and the strong coupling constant was extracted.
Speaker: Paris Gianneios (Université Libre de Bruxelles (BE)) -
3:45 PM
The path to approximate N3LO NNPDF Parton Distributions 15m
We extend the existing NNPDF4.0 sets of parton distributions (PDFs) to approximate next-to-next-to-next-to-leading (aN3LO).
We construct an approximation to the N3LO splitting functions that includes all available partial information from both fixed-order computations and from small- and large-x resummation, and estimate the uncertainty on this approximation. We include known N3LO corrections to DIS structure functions.
The determined PDFs will account both for uncertainties due to incomplete knowledge of N3LO terms and to missing higher corrections.
We compare our results to the existing aN3LO PDFs from the MSHT group.
Finally, we examine the phenomenological impact of aN3LO PDFs at LHC, giving a first assessment of the impact on the Higgs and Drell-Yan total production cross-section. We find that aN3LO corrections to NNPDF4.0 PDFs are in agreement with their NNLO counterparts, that they improve the description of the global dataset and the perturbative convergence.Speaker: Giacomo Magni (Nikhef, VU Amsterdam)
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Technology and Industrial Applications Club C
Club C
Convener: Maxim TITOV (CEA Saclay)-
2:30 PM
Technology Incubation 15m
An ambitious project of the CzechInvest agency implemented with financial support from the state budget through the Ministry of Industry and Trade in the programme The Country for the Future.
Without supporting high disruptive start-ups in the Czech Republic. Our goal is to seek out and help create companies/projects that are exceptionally innovative, feasible and scalable.Speaker: Kristina Liskova -
2:45 PM
Study of zirconolite ceramic compositions through swift heavy ion irradiations from 15 UD tandem pelletron for immobilizing nuclear wastes 15m
Low and high energy radiation resistance behaviour of synthetic compounds to immobilize HLWs is made out on zirconolites for radiation and thermal stability besides high loading capacity on incorporation of lanthanides and actinides, maintaining crystallinity of host element. Nuclear energy significantly contributes to global energy needs from low carbon emissions providing clean environment but spent nuclear fuel poses threat to ecological and environmental safety. Over a period, novel nuclear waste forms have been evolved to immobilize high level wastes. Swift heavy ion induced effects on Nd-doped and Ce- & Y-doped zirconolites as a function of temperature through irradiation from a 15 UD tandem pelletron accelerator beam facility are examined for structural changes. The doped zirconolites have been found stable after swift heavy ion irradiations making them potential candidates for immobilization of radioactive wastes and their usefulness in nuclear reactor engineering.
Speaker: Dr Sardool Singh Ghumman (Sant Longowal Institute of Engineering and Technology) -
3:00 PM
Muon tomography with multiplexed Micromegas detectors using compact telecopes for societal applications 15m
Muon tomography has emerged as a powerful technique for non-invasive imaging in various fields, including nuclear security, geology, and archaeology. For ten years, genetic multiplexed resistive Micromegas (MultiGen) detectors, invented at CEA/Irfu, have been developed for muon tomography, aiming to enhance imaging resolution and efficiency. MultiGen detectors provide telescopes with high spatial resolution, and a low number of electronic channels, making them suitable for deployment in various experimental environments, including those encountered in projects like ScanPyramids and nuclear dismantling.
After describing our effort to optimize the MultiGen-based telescopes, our contribution in ScanPyramids project and the first three-dimensional muon tomography of a nuclear reactor will be presented. A sustained effort was also made to produce MultiGen detectors in a Frencg PCB company.
Future projects on nuclear dismantling for non-destructive inspection and imaging will be presented.
Speaker: Dr David Attie (Université Paris-Saclay (FR)) -
3:15 PM
The development of a laser-hybrid approach to the delivery of ion beams for biomedical application 15m
The ``Laser-hybrid Accelerator for Radiobiological Applications'', LhARA, is being developed to serve the Ion Therapy Research Facility (ITRF). ITRF/LhARA will be a novel, uniquely-flexible facility dedicated to the study of the biological impact of proton and ion beams. The technologies that will be demonstratedcan be developed to transform the clinical practice of proton and ion beam therapy (PBT) by creating a fully automated, highly flexible laser-driven system to:
* Deliver multi-ion PBT in completely new regimens at ultra-high dose rate in novel temporal-, spatial- and spectral fractionation schemes; and
* Make PBT widely available by integrating dose-deposition imaging with real-time treatment planning in an automatic, triggerable system.
The status of the ITRF/LhARA project will be described along with the collaboration’s vision for the development of a transformative proton- and ion-beam system.Speaker: Kenneth Richard Long (Imperial College (GB)) -
3:30 PM
Fast timing detectors with applications in cosmic ray physics and medical science 15m
We discuss the use of Low Gain Avalanche (LGAD) silicon detectors for two specific applications, namely measuring cosmic rays in space in collaboration with NASA and beam properties and doses for patients undergoing cancer treatment in flash beam therapy. For the first time, the use of LGADs and fast sampling electronics will be used in space in order to identify the type of particles in cosmic rays and measure their energies. Similar techniques allow to measure instantaneously with high precision the doses received by patients in flash beam therapy.
Speaker: Christophe Royon (The University of Kansas (US)) -
3:45 PM
Dynamic nuclear polarisation: From polarised targets in hadron physics to medical imaging 15m
Since 1960s nuclear polarised targets have been an essential tools for study of spin structure of nucleons. The solid state polarised targets make use of the Dynamic Nuclear Polarisation (DNP). Spin physics observables strongly depend on the degree of nuclear polarisation. This is similar issue for the Nuclear Magnetic Resonance (NMR) and NMR Imaging, where the sensitivity also strongly depends on the degree of nuclear polarisation. Additionally one of special NMR techniques, the radiation detected NMR (RD-NMR), also requires high degree of polarisation. The RD-NMR has been predominantly performed using beams of radioactive nuclei polarised. With the widespread availability of isotopes for medical use, DNP could allow for use of RD-NMR outside of beam facilities.
In this contribution we will illustrate the rich history of polarised targets and present the current project for the first ever use of DNP for polarisation of unstable nuclei to be used for potential medical applications.Speaker: Dr Michael Pesek (CERN) -
4:00 PM
The R&D of the High Light Yield and High Density Glass Scintillator for High Energy Physics Detectors 15m
Scintillation materials can convert high-energy rays into visible light. Compared with crystal scintillator, the glass scintillator has many advantages, such as a simple preparation process, low cost and continuously adjustable components. Therefore, glass scintillator has long been conceived for application in the nuclear detection such as hadronic calorimeter. Given the deficiency of the crystal and the plastic scintillator, a new concept, Glass Scintillator Hadronic Calorimeter was proposed. In 2021, the researchers in the Institute of High Energy Physics (IHEP) have set up the Large Area Glass Scintillator Collaboration (GS group) to study the new glass scintillator with high density and high light yield. Currently, a series of high density and high light yield scintillation glasses have been successfully developed. The density of Ce3+ doped borosilicate and silicate glasses exceed 6 g/cm3 with a light yield of 1000 ph/MeV.
Speaker: Sen Qian
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Top Quark and Electroweak Physics Club E
Club E
Conveners: Dr Maria Moreno Llacer (Univ. of Valencia and CSIC (ES)), Peter Berta (Charles University, Prague (CZ))-
2:30 PM
Searches for rare and beyond the Standard Model top-quark production and decay at CMS 18m
Millions of top quarks already produced at LHC TeV are ideal for searching for rare top-quark decays. Besides flavor-changing neutral currents that are highly suppressed in the Standard Model, baryon and lepton number conservation can be probed in top quark events. In this talk, recent searches for rare and beyond the Standard Model top-quark production and decay with significantly increased sensitivity will be discussed. Several of the measurements are the first of their kind.
Speaker: Ece Asilar (Hanyang University) -
2:48 PM
Lepton flavour universality and violation using top quarks 18m
The LHC is a top factory and run 2 has delivered billions of top quarks to the experiments. In this contribution, the results are presented of searches by the ATLAS experiment for Charge Lepton Flavour Violation (cLFV), and lepton flavour universality where the ratio of the branching ratios of the W boson to muons and electrons is measured.
Speaker: Jacob Julian Kempster (University of Sussex (GB)) -
3:06 PM
Searches for FCNC in top events with the ATLAS detector 18m
The LHC is a top quark factory and provides a unique opportunity to look for top quark production and decay processes that are highly suppressed or forbidden in the SM. In this contribution results are presented of searches for Flavour Changing Neutral Currents (FCNC) interactions of the top quark. These processes are beyond the experimental sensitivity in the SM, but can receive enhanced contributions in many extensions of the SM. Any measurable sign of such interactions is an indication of new physics. An overview is presented of this search programme, with emphasis on recent searches for FCNC tqX vertices, where X is a Z-boson, a photon, or a Higgs boson, with several Higgs decay channels. A combination for the Higgs-decay related searches is also shown. All searches find good agreement with the background expectation and exclusion bounds are derived that improve very significantly on previous results.
Speaker: Lidia Dell'Asta (Università degli Studi e INFN Milano (IT)) -
3:24 PM
Looking for the solution to the Hierarchy Problem in Top physics 18m
The top quark loop gives the major quantum correction to the Higgs mass squared, playing the dominant role in the well-known Hierarchy Problem. Traditional models address the issue by introducing TeV-scale top partners. However, the absence of these new particles urges for an alternative solution. In this talk, I will present a new scenario where the top Yukawa coupling is modified to tackle the hierarchy problem. In the model, the top Yukawa coupling is strongly suppressed at high scales due to new interactions and degrees of freedom which will have direct impacts on Top physics. I will discuss both the possible UV completions and the relevant phenomenology.
Speaker: Yi Chung -
3:42 PM
Dispelling the sqrt(L) myth for the High-Luminosity LHC 15m
Extrapolations of sensitivity to new interactions and standard model parameters inform the particle physics community about the potential of future upgrade programmes and colliders. Statistical considerations based on inclusive quantities and established analysis strategies typically give rise to a sensitivity scaling with the square root of the luminosity, $\sqrt{L}$. This suggests only a mild sensitivity improvement for the LHC's high-luminosity phase (HL-LHC), compared to the presently available LHC data. We provide clear evidence that the $\sqrt{L}$ scaling for the HL-LHC is overly conservative and unrealistic, using representative analyses in top quark, Higgs boson and electroweak gauge boson phenomenology.
Speaker: Roman Kogler (DESY (DE)) -
3:57 PM
The top quark EW couplings in the SMEFT - 18m
The electro-weak couplings of the top quark are directly accessible in rare "top+X" production processes at the LHC, where top quark pairs or single top quark are produced in associations with bosons. We present a new analysis of the top sector of the Standard Model EFT. The fit is based on a fully NLO parameterization and includes the most recent (differential) results from ATLAS and CMS. We show that run 2 of the LHC allows, for the first time, to overconstrain the qqttbar and two-fermion operator coefficients and yields competitive bounds. We compare the current bounds to projections for the HL-LHC and future lepton colliders, that can yield powerful constraints.
Speaker: Victor Miralles (University of Manchester)
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Heavy Ions Club B
Club B
Convener: Katarina Krizkova Gajdosova (Czech Technical University in Prague (CZ))-
2:45 PM
Using Multivariate Cumulants to Constrain the Initial State in XeXe and PbPb Collisions at the CMS Experiment 17m
For the first time, correlations between higher order moments of two and three Fourier flow harmonics (up to orders 8 or 10) are measured in Run 2 XeXe (deformed nuclei) and Run 3 PbPb (spherical nuclei) collisions data as a function of collision centrality. The measurements are performed with multiparticle mixed harmonic cumulants using charged particles in the pseudorapidity region |$\mathrm{\eta}$| < 2.4 and transverse momentum range 0.5 < $p_\mathrm{T}$ < 3.0 GeV/c. The results are compared to calculations using the IP-Glasma+MUSIC+UrQMD model to constrain the initial-state deformation parameters of Xe nuclei. The higher order moments of cumulants, skewness, kurtosis, and superskewness (5th moment) are expressed through the $v_\mathrm{2}${2k } (k = 1, ..., 5) harmonics and are measured against centrality. These moments probe the dependence of flow harmonics on the size and initial geometry of the system as well as the transport properties of the quark-gluon plasma.
Speaker: Aryaa Dattamunsi (Indian Institute of Technology Madras (IN)) -
3:02 PM
Probing the speed of sound in QGP with multi-particle [pT] cumulants in ALICE 17m
The speed of sound squared, $c_s^2$, a property of the quark-gluon plasma (QGP) connected to the QCD equation of state, can be extracted from ultra-central heavy-ion collisions, where the medium maintains a fixed size and the initial-state and thermal fluctuations dominate. We present the first ALICE measurements of the event-by-event mean transverse momentum, $\langle[p_\mathrm{T}]\rangle$, its average and higher-order fluctuations as a function of multiplicity using particle spectra and multi-particle $\langle[p_\mathrm{T}]\rangle$ cumulant techniques, in ultra-central Pb--Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV. The pronounced rise in $\langle[p_\mathrm{T}]\rangle$ and the sudden transition in higher-order fluctuations at high multiplicities are used to extract the $c_s^2$ and to probe the thermalization of the QGP. Our approach yields valuable insights into the thermalized nature of the QGP, contributing to a deeper understanding of the QCD equation of state.
Speaker: Omar Vazquez Rueda (University of Houston (US)) -
3:19 PM
Polarization and flow of multi-strange hadrons with ALICE 17m
The elliptic flow ($v_2$) of identified hadrons is an observable sensitive to the early dynamics of heavy-ion collisions and to the equation of state (EoS) of the medium. In particular, strange and (multi-) strange baryons have small hadronic cross-sections, thus being clean probes of the early stages of the collision systems' evolution. Additionally, strange and multi-strange baryons are also sensitive to the vorticity of the produced medium and to the magnetic field that it experiences at collision time. The effect of vorticity and magnetic field can be examined experimentally by studying the polarization of strange and (multi-) strange baryons. This talk will present the $v_{2}$ and the polarization of $\Lambda$, $\Xi^\pm$ and $\Omega^\pm$ measured with the high statistics Pb-Pb collisions collected by the ALICE collaboration during the Run 3 of the LHC.
Speaker: Chiara De Martin (Universita e INFN Trieste (IT)) -
3:36 PM
J/𝜓 production and polarization in photon-induced reactions in Pb--Pb collisions with ALICE 17m
Intense electromagnetic fields from ultrarelativistic heavy ions can trigger photonuclear reactions, which can be used to probe the nuclear gluon distribution at low Bjorken-$x$ and targets gluonic fluctuations. Our study examines ultra-peripheral and nuclear-overlap collisions, covering measurements of peripheral Pb--Pb collisions' $y$-differential cross section and coherent J/$\psi$ photoproduction polarization. We present new Run 2 measurements, including $p_T$ spectra of incoherent J/$\psi$ in Pb--Pb UPCs at both forward and midrapidity, revealing lead nucleus substructure. Additionally, we observe J/$\psi$ photoproduction with proton dissociation in p--Pb collisions, offering fresh insights into proton sub-nucleonic fluctuations. Combining forward and midrapidity data offers a robust test of theoretical models.
Speaker: Roman Lavicka (Austrian Academy of Sciences (AT)) -
3:53 PM
Impact studies of the gluon PDF using exclusive J/ψ photoproduction data in xFitter 17m
We discuss exclusive heavy-vector-meson photoproduction in ultraperipheral collisions at the LHC in a tamed collinear factorisation approach at Next-to-Leading Order (NLO). By employing the Shuvaev transform as a reliable means to relate Generalised Parton Distributions (GPDs) to Parton Distribution Functions (PDFs) at small values of the skewness parameter ξ, we perform a parton analysis within the public PDF fitting tool xFitter to determine the gluon PDF at moderate-to-low values of x using recent measurements from the LHC. We comment on the prospects of this approach to ascertain the nuclear gluon PDF in heavy-ion collisions. Additionally, we emphasise that a combined fit to exclusive heavy-quarkonium production data from multiple collision systems will increase our understanding of the underlying theoretical mechanisms at play in these interactions and, importantly, lead to an improved understanding of the behaviour of the gluon distribution in the proton and nuclei at small x.
Speaker: Chris Flett (IJCLab)
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Social Program Foyer - Winter Garden
Foyer - Winter Garden
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Exhibition free guided tour (I) 30m Foyer - Winter Garden
Foyer - Winter Garden
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Coffee break Foyer Floor 2
Foyer Floor 2
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Accelerators: Physics, Performance, and R&D for future facilities Club D
Club D
Convener: Jiri Kral (CERN)-
4:45 PM
Significant upgrades of magnetic horn system for J-PARC neutrino beamline towards 1.3 MW beam power 18m
Realization of high intensity neutrino beam over 1 MW beam power is crucial to search for CP violation in Lepton sector. J-PARC accelerator and neutrino beamline are being upgraded towards 1.3 MW beam power for Hyper-Kamiokande experiment. Magnetic horns are used to focus secondary particles produced in a neutrino production target and can intensify the neutrino beam by more than an order of magnitude. Significant upgrades have been made in recent years. Rated current is increased from 250kA to 320kA, which enable to increase the neutrino intensity by 10%, by upgrading almost all the electrical components of the system (power supplies, transformers, etc). Cooling capability has also been improved by developing a new cooling scheme. Reinforcement of removal of hydrogen gas produced from a water radiolysis by intense beams has also been in progress. Details of the upgrades and operation experience, as well as prospects for 1.3 MW operation, are described.
Speaker: Tetsuro Sekiguchi -
5:03 PM
High intensity upgrades for fixed-target experiments at CERN 18m
A plethora of ideas for exploiting the full scientific potential at the fixed-target complex has been brought forward within the Physics Beyond Colliders Initiative (PBC) at CERN seeking to exploit the full intensity the Super Proton Synchrotron (SPS) can provide. Out of the findings of a PBC Task Force, a new project has been mandated to prepare the technical design for a new high-intensity user facility in the ECN3 cavern in the CERN North Area for beam dump and/or kaon physics. In addition, several experiments wish to have higher intensities of secondary beams to address searches for BSM physics, amongst them NA64, employing high-energy electron and muon beams, as well as MuonE, aiming to measure the hadron vacuum polarisation as an input to explain the $(g-2)_µ$ puzzle. Also in the QCD sector, several high-intensity experiments are proposed, such as AMBER with a rich physics programme ranging from determining the proton radius with muon beams to meson structure investigations.
Speaker: Johannes Bernhard (CERN) -
5:21 PM
Update on TWOCRYST: the feasibility of double-crystal fixed-target experiments at the LHC 15m
The Physics Beyond Colliders (PBC) study at CERN explores, among other topics, the potential of extending the Large Hadron Collider (LHC) physics program by Fixed-Target (FT) experiments. One option is to use two bent crystals (double-crystal setup): the first crystal deflects particles from the beam halo onto an in-vacuum target. Another crystal deflects short-lived particles created in the target, thus inducing spin precession. This setup has the potential to measure the electric and magnetic dipole moments of these particles, well beyond what can be done with magnets. The second crystal must induce a deflection of several mrad over a few cm. A proof-of-principle setup, TWOCRYST, is foreseen to be installed in the LHC and operated in 2025. It aims to validate the operational feasibility, assess the crystal properties at TeV energies, and gather data on achievable statistics. This contribution outlines the principle and objectives of the TWOCRYST project and the studies planned.
Speaker: Pascal Hermes (CERN) -
5:36 PM
EIC Electron Injector Systems Overview 18m
We review the current plans for the EIC Electron Injector chain. These include and overview of the accelerator chain necessary to deliver 5, 10 and 18 GeV polarized electrons to the Electron Storage Ring (ESR), the charge accumulation and polarized electron transport approach.
Speaker: Vahid Ranjbar -
5:54 PM
The LHeC and FCC-eh experimental program 18m
Leveraging the novel concept of ERLs, we present the LHeC and FCC-eh that allow the exploration of electron-hadron interactions above TeV scale. The presented design of the electron accelerator is based on two superconducting linear accelerators in a racetrack configuration that can produce lepton beam energies in excess of 50 GeV. In energy recovery mode, the accelerator is capable of reaching luminosities in excess of 10$^{34}$ cm$^{-2}$s$^{-1}$ with an energy footprint of around 100 MW for the electron accelerator. The proposed collider concept enables luminosity values high enough for a general-purpose experimental program. While the envisaged physics results have the potential to empower the HL-LHC or FCC-hh physics results, they also include flagship EW, Higgs, QCD and top quark measurements beyond current precision, and complementary BSM searches. New thematic ep/eA@CERN WGs are pursued with the HL-LHC and the EIC programs.
Speaker: Jorgen D'Hondt (Vrije Universiteit Brussel (BE))
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Astro-particle Physics and Cosmology South Hall 2B
South Hall 2B
Convener: Dr Pietro Betti (Department of Physics and Astronomy, University of Florence and INFN sezione di Firenze)-
4:45 PM
The LIGO-VIRGO-KAGRA Observing Run 4 (May 2023 – January 2025) 20m
The Observing Run 4 (O4) is the most recent period of data taking for the LIGO-Virgo-KAGRA (LVK) network of ground-based gravitational-wave (GW) interferometric detectors. Its first half, O4a, started in May 2023 and ended in January 2024 while its second part, O4b, is scheduled to start in April 2024 after a two-month commissioning break, and to end in January 2025. After an introduction summarizing the evolution of the different detectors since the end of Observing Run 3 (O3) in March 2020 and their current status, this talk will review the performance of the network and of the individual instruments since the beginning of O4. Some emphasis will be put on the improved alert system that allows astronomers to be notified in low latency when a promising transient GW candidate is identified. To conclude, the plans of the three collaborations for the coming years will be discussed.
Speaker: Dr Nicolas Arnaud (IJCLab (Université Paris-Saclay and CNRS/IN2P3)) -
5:05 PM
Data Quality and Event Validation in LIGO-Virgo-KAGRA Fourth Joint Observational Campaign 20m
The success of gravitational wave astronomy hinges on precise data quality assessment and the meticulous validation of detected events. This presentation emphasizes the critical role of these processes, focusing on their importance within the ongoing O4 joint observational campaign of the LIGO, Virgo, and KAGRA detectors. We begin by introducing the concepts of detector sensitivity and data quality, with a particular emphasis on data quality issues. We then examine how these issues impact the search for astrophysical signals, affecting their confidence levels and the reliability of astrophysical parameter estimation results. We emphasize the importance of robust statistical tests in distinguishing genuine signals from noise. Additionally, we delve into the process of event validation, which involves scrutinizing candidate signals to support their astrophysical origin. Our discussion includes the presentation of the framework used in O4 to assess these properties effectively.
Speaker: Francesco Di Renzo -
5:25 PM
High Frequency Gravitational Wave Detection with SRF Cavities 15m
So far, high frequency gravitational waves (GWs) remain unexplored messengers of new physics. Proposed sources in the MHz - GHz band include primordial black hole (PBH) mergers, PBH superradiance and several stochastic backgrounds.
Our collaboration is working on tapping into this source by employing superconducting radio frequency cavities for high precision measurements.
The detection principle is to load an EM mode of a cavity so that a GW-induced vibration of the cavity walls up-converts some power into another, unloaded EM mode. The power in the unloaded mode is then taken to be the GW signal.
This talk will outline the ongoing work and future plans of our project in Hamburg. Specifically, the projected sensitivity to potential sources, the cavity design, and the signal readout mechanism will be discussed.
Speaker: Tom Krokotsch (University of Hamburg) -
5:40 PM
The Euclid mission: scientific forecast, overview and status 20m
The Euclid mission satellite was launched on July 1st, 2023 from Cape Canaveral, Florida, with a Space X Falcon 9 rocket . After one month journey it is set in its orbit around the Sun-Earth L2 point and has already finished its commissioning period. Euclid survey started in February 2024 and will map 15000 deg2 of the sky in the following six years observing more than 1 billion galaxies with unprecedented image quality. The survey will provide a 3D map of the universe and will improve out knowledge on the cosmological model by an order of magnitude with respect to current constraints. This talk will describe the Euclid mission, its instruments, its current status and first images, the expected schedule on Data Releases, and describe the cosmological probes that will be measured and how it will contrubete to our understanding of the dark content of the Universe.
Speaker: Cristobal Padilla Aranda (IFAE-Barcelona (ES)) -
6:00 PM
Status and prospects of the LHCf experiment 20m
The Large Hadron Collider forward (LHCf) experiment, located at the LHC, plays a crucial role in high-energy particle physics research, specifically in measuring neutral particle production in the forward pseudorapidity region, to improve the understanding of ultra-high energy cosmic ray interactions with the Earth atmosphere. Our presentation will summarize the latest advancements from LHCf, focusing on the significant findings from Run II in 13 TeV proton-proton collisions. We will show the measured spectra for key particles such as photons, neutrons, $\pi^0$ and $\eta$. Additionally, we will highlight the combined analysis with the ATLAS experiment, in particular emphasizing the energy spectra of very-forward photons in diffractive collisions. Finally, we will discuss the successful data-taking in 13.6 TeV proton-proton collisions of Run III, preliminary results for the corresponding ongoing analyses and the motivation for the next operation in proton-oxygen collisions at the LHC.
Speaker: Giuseppe Piparo (Universita e INFN, Catania (IT))
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Beyond the Standard Model: Block 4 South Hall 1A
South Hall 1A
Conveners: Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE)), Sezen Sekmen (Kyungpook National University (KR))-
4:45 PM
Searches for strong production of supersymmetric particles 17m
upersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments favour supersymmetric partners of the gluons and third-generation quarks with masses light enough to be produced at the LHC. This talk will present the latest results of searches conducted by the ATLAS experiment which target gluino and squark production, including stop and sbottom, in a variety of decay modes within RPC SUSY
Speaker: Marco Rimoldi (CERN) -
5:02 PM
Global LHC constraints on electroweak-inos with SModelS v2.3 17m
Electroweak-inos, superpartners of the electroweak gauge and Higgs bosons, play a special role in supersymmetric theories. Their intricate mixing into chargino and neutralino mass eigenstates leads to a rich phenomenology, which makes it difficult to derive generic limits from LHC data. We present a global analysis of LHC constraints for promptly decaying electroweak-inos in the context of the minimal supersymmetric standard model, exploiting the SModelS software package. Combining up to 16 ATLAS and CMS searches, we study which combinations maximise the sensitivity in different regions of the parameter space, how fluctuations in the data in individual analyses influence the global likelihood, and what is the resulting exclusion power of the combination compared to the analysis-by-analysis approach. Coupled with a bottom-up procedure, we also highlight parameter space regions that maximally violate the standard model hypothesis while remaining compatible with the LHC constraints.
Speaker: Timothee PASCAL (LPSC (CNRS)) -
5:19 PM
A SMEFT Analysis of Third-generation New Physics 17m
In the quest for physics beyond the Standard Model, TeV-scale New Physics (NP) remains a very attractive possibility. However, this is challenged by constraints across different energy scales, from flavour observables to high-$p_T$ searches at the LHC, going through electroweak precision tests. The emerging picture is that TeV-scale NP cannot have a generic flavour structure. In particular, the idea of new states coupled mainly to the third generation has recently received a lot of attention.
We present a model-independent analysis of this scenario within the SMEFT, with a $U(2)^5$ symmetry imposed on the effective operators. This reduces the number of parameters to 124, which we analyse one-by-one, taking into account RGE effects and flavour violation from the leading $U(2)$ breaking term, and confronting them against current data. We then show how under non-tuned hypotheses NP coupled mainly to the third generation can still be compatible with an effective scale as low as 1.5 TeV.Speaker: Lukas Allwicher -
5:36 PM
How PDFs can conceal New Physics 17m
The interpretation of LHC data, and the assessment of possible hints of new physics (NP), require precise knowledge of the proton structure in terms of parton distribution functions (PDFs). These are usually extracted with a data-driven approach, assuming that the underlying theory is the SM, and later used as inputs for theoretical predictions in searches for NP. The evident inconsistency of the procedure demands an investigation as to whether NP could inadvertently be absorbed in the proton parametrisation and hinder the discovery of subtle deviations from the SM. In order to tackle this problem, we devise two strategies. First, we develop a a robust framework to perform simultaneous fits of SMEFT Wilson coefficients and PDFs, enabling us to disentangle the different sources of information coming from the data. Secondly, we present a systematic methodology designed to determine whether global PDF fits can inadvertently fit away signs of NP in the high-energy tails of distributions.
Speaker: Luca Mantani (DAMTP, University of Cambridge) -
5:53 PM
Drell-Yan SMEFT at NLO 17m
The Drell Yan (DY) scattering is an highly sensitive probe for new physics. Indeed, being a well measured phenomenon, any deviation between experimental and theoretical results could point at new physics beyond the Standard Model. To enable precise comparisons between theory and experimental data, extensive calculations have been performed in both the electroweak and QCD sectors of the Standard Model. Following this line of reasoning, the DY scattering has been investigated also in the Standard Model Effective Field Theory (SMEFT) framework, both at LO and NLO. Nevertheless, existing results do not include 4-fermion operators at NLO SMEFT. In this talk we extend these calculations in order to include all dimension-6 operators with an arbitrary flavor structure, providing NLO QCD and electroweak for the neutral Drell-Yan process.
Speaker: Luigi Bellafronte (Florida State University)
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4:45 PM
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6:30 PM
Dark Matter Club A
Club A
Conveners: Marek Matas (Czech Technical University), Sara DIGLIO (SUBATECH/CNRS/In2p3)-
4:45 PM
Neutrino constraints on inelastic dark matter captured in the Sun 17m
We study the possibility for large volume underground neutrino experiments
to detect the neutrino flux from captured inelastic dark matter in the Sun.
The neutrino spectrum has two components: a mono-energetic "spike" from
pion and kaon decays at rest and a broad-spectrum "shoulder" from prompt
primary meson decays. We focus on detecting the shoulder neutrinos
from annihilation of hadrophilic inelastic dark matter with masses in the
range 4-100 GeV. We find the region of parameter space that these
neutrino experiments are more sensitive to than the direct-detection
experiments. For dark matter annihilation to heavy-quarks, the projected
sensitivity of DUNE is weaker than current (future) Super (Hyper) Kamiokande
experiments, while for the light-quark channel, only the spike is
observable and DUNE will be the most sensitive experiment.Speaker: Prof. Ina Sarcevic (University of Arizona) -
5:02 PM
Dark sector and Axion-like particle search at BESIII 17m
BESIII is a symmetric $e^+e^-$ collider operating at c.m. energy from 2.0 to 4.95 GeV. With the world’s largest data set of $J/\psi$ (10 billion), and $\psi$(3686) (2.6 billion), and about $25 fb^{-1}$ of energy scan data from 3.77 to 4.95 GeV, various dark sectors particles produced in $e^+e^-$ annihilation and meson decay processes can be searched for at BESIII. Axion-like particles (ALPs) are pseudo-Goldstone bosons arising from some spontaneously broken global symmetry, addressing the strong CP or hierarchy problems. In this talk, we report the search for invisible dark photon decays using initial state radiation, search for invisible muonic Z’ boson decays, and search for axion-like particles with a light scalar or vector particle in the muonic decay of $J/\psi$.
Speaker: Xiaoxuan Ding -
5:19 PM
The Scintillating Bubble Chamber for Dark Matter and Neutrino detection 17m
The Scintillating Bubble Chamber (SBC) experiment is a novel low-background technique aimed at detecting low-mass WIMP interactions and coherent scattering of reactor neutrinos (CEvNS). The detector consists of a quartz-jar filled liquid argon, spiked with 100 ppm of xenon to act as a wavelength shifter. The target fluid is de-pressurized into a super-heated state by a mechanically controlled piston. Particles interacting with the fluid can generate heat (bubbles) and scintillation light, depending on the energy intensity and density. The detector is equipped with cameras, SiPMs, and piezo-acoustic sensors to detect events. In this talk, I will present the design of SBC and provide an update on the ongoing commissioning and calibration of an SBC device at Fermilab. Finally, I will discuss the collaboration’s plans for operation at SNOLAB and at a reactor for physics searches.
Speaker: Hugh Lippincott (UCSB) -
5:36 PM
Recasting scalar-tensor theories of gravity for colliders 17m
Diagrammatic approaches to perturbation theory transformed the practicability of calculations in particle physics. In the case of extended theories of gravity, however, obtaining the relevant diagrammatic rules is non-trivial: we must expand in metric perturbations and around (local) minima of the scalar field potentials, make multiple field redefinitions, and diagonalise kinetic and mass mixings. In this talk, I will motivate these models, introduce the package FeynMG — a Mathematica extension of FeynRules that automates the process described above — and describe an application to a model with unique collider phenomenology.
Speaker: Dr Peter Millington (University of Manchester) -
5:53 PM
Boosting the production of sterile neutrino dark matter with self-interactions 18m
Sterile neutrinos are well-motivated and simple dark matter (DM) candidates. However, sterile neutrino DM produced through oscillations by the Dodelson-Widrow mechanism is excluded by current X-ray observations and bounds from structure formation. One minimal extension, that preserves the attractive features of this scenario, is self-interactions among sterile neutrinos. In this work, we analyze how sterile neutrino self-interactions mediated by a scalar affect the production of keV sterile neutrinos for a wide range of mediator masses. We find four distinct regimes of production characterized by different phenomena, including partial thermalization for low and intermediate masses and resonant production for heavier mediators. We show that significant new regions of parameter space become available which provide a target for future observations.
Speaker: Stefan Vogl (University of Freiburg)
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Detectors for Future Facilities, R&D, Novel Techniques Club H
Club H
Conveners: Gabriella Gaudio (INFN-Pavia), Jana Faltova (Charles University (CZ))-
4:45 PM
Status and perspectives of the OREO (ORiEnted calOrimeter) project 17m
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