Phase transitions are of wide interest to be sure; whether it's in superconductors or the early universe: Beyond the Standard Model scenarios like Baryogenesis cry out for a strong first-order phase transition. So a precise description of phase transitions is vital.
Phase transitions are, in field theory, studied with numerical methods (lattice) and perturbative calculations (the effective...
The increase of the particle flux (pile-up) at the HL-LHC with luminosities of L ≃ 7.5 × 10^34 cm−2s−1 will have a severe impact on the ATLAS detector reconstruction and trigger performance. The end-cap and forward region where the liquid Argon calorimeter has coarser granularity and the inner tracker has poorer longitudinal vertex position resolution will be particularly affected. A High...
The electronics of the CMS (Compact Muon Solenoid) DT (Drift Tubes) chambers will need to be replaced for the HL-LHC (High Luminosity Large Hadron Collider) operation due to the increase of occupancy and trigger rates in the detector, which cannot be sustained by present system. A system is being designed that will forward asynchronously the totality of the chambers signals to the control...
Starting from precision measurements at an e+e− Higgs factory, it is possible to extract the Higgs boson couplings using a general fit to the parameters of Standard Model Effective Field Theory (SMEFT). To understand the precisions that are possible, and to evaluate the role of each measurement offered by various Higgs factory proposals, it is important to understand the dependence of each...
We study the dependence of neutral current (NC) neutrino-induced π0/photon production (νμ+A→νμ+1π0/γ+X) on the atomic number of the target nucleus, A, at 4-momentum transfers relevant to the MiniBooNE experiment: Δ resonance mass region. Our conclusion is based on experimental data for photon-nucleus interactions from the A2 collaboration at the Mainz MAMI accelerator. We work in the...
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, in events such as the CERN Open Days in 2019, and using online platforms such as social media. This innovative approach using the juxtaposition of cake and...
Two dimensional Lorentz invariant theories allow the existence of new non-local terms in the Lagrangian, with a null vector as in four dimensional SIM(2) invariant theories. We explore the consequences of these new terms in the Schwinger model, where a new fermionic mass term does not break the chiral invariance in the classical equations. In the computation we get the same anomaly term, with...
Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator detector under construction in China,which is designed to primarily determine the neutrino Mass Hierarchy(MH) by detecting reactor anti-neutrinos via inverse beta decay.JUNO energy response is strongly position-dependant due to the detector structure and dimension.The energy resolution should be <3%/ (the...
While ALICE is currently undergoing major upgrades which will come online for LHC Run 3 (starting in 2021), further projects are already on their way. ALICE is developing thinned wafer-sized monolithic active pixel sensors to replace the inner tracking layers in the Long Shutdown 3 (starting in 2025). This resulting detector will have an unprecedentedly low material budget, and consequently...
The ALICE detector at the LHC is undergoing major upgrades during the Long Shutdown 2 (2019/20). A new Inner Tracking System (ITS) is being installed and the Time Projection Chamber (TPC) has been equipped with new GEM-based read-out chambers. Together with the new front-end-electronics they will enable us to read out the TPC continuously and record the full minimum-bias interaction rate of 50...
Silicon vertex detector is located in center of Belle II detector to provide precise measurement of vertex position decayed particles. It is composed by the DEPFET pixel and DSSD strip sensors. This poster will present experiences with determination, validation and monitoring alignment parameters of vertex detector.
The ALPIDE MAPS chip used in the ALICE silicon tracker upgrade, represents the state of the art for pixel-based tracking with silicon.
We investigated the possibility to use the ALPIDE chip in space applications using a setup derived from the ALICE Outer Barrel HIC.
We first addressed the issue of the power consumption and we will report on a special setup that provides a relevant power...
This paper presents a class of relativistic solutions of Einstein field equation which could describe static, spherical anisotropic fluid configurations, and could serve as models for compact stars. Making use of the Vaidya-Tikekar metric ansatz (J. Astrophys. Astron. 3 (1982) 325), as one of the metric functions, we obtain the other metric function by utilizing the Karmakar embedding...
The muon g-2 experiment at Fermilab seeks to confirm or deny the ~3.5 $\sigma$ discrepancy between the Standard Model prediction of the muon anomalous magnetic moment, $a_{\mu}$, and its experimental value. The experiment measures $a_\mu$ directly from the ratio of the muon precession frequency in a uniform storage ring magnetic field to the Larmor frequency of free protons in the same field....
Fermionic dark matter (DM) with attractive self-interaction is possible to form black holes (BH) inside the Gyr-old neutron stars (NS). Therefore by observing such NS corresponding to their adjacent DM environments can place bounds on DM properties, eg. DM-baryon cross section $\sigma_{\chi b}$, DM mass $m_\chi$, dark coupling $\alpha_\chi$ and mediator mass $m_\phi$. In case of isospin...
Analysis of anisotropy of the arrival directions of galactic protons, electrons and positrons has been performed with the Alpha Magnetic Spectrometer on the International Space Station. These results allow to differentiate between point-like and diffuse sources of cosmic rays for the explanation of the observed excess of high energy positrons. The AMS results on the dipole anisotropy are...
The fluxes and flux ratios of charged elementary particles in cosmic rays are presented in the absolute rigidity range from 1 up to 2000 GV. In the absolute rigidity range ∼60 to ∼500 GV, the antiproton, proton, and positron fluxes are found to have nearly identical rigidity dependence and the electron flux exhibits different rigidity dependence. Below 60 GV, the antiproton-to-proton,...
ArgonCube is a novel design for Liquid Argon Time Projection Chambers (LAr TPCs), segmenting the total detector volume into a number of electrically and optically isolated TPCs sharing a common cryostat. For the charge-readout, a pixelated anode plane is employed, providing unambiguous 3D event reconstruction. In order to maximise the active TPC volume a new technology is used for...
The OCRA (Outreach Cosmic Ray Activities) INFN program includes public engagement events related to astroparticle physics and in particular it coordinates the twenty INFN Units that participated in the 2019 edition of the International Cosmic Day (ICD), an astroparticle physics outreach event organized by DESY. The ICD is dedicated to high school students from all over the world, who engage in...
Liquid argon (LAr) sampling calorimeters are employed by ATLAS for all electromagnetic calorimetry in the pseudo-rapidity region |η| < 3.2, and for hadronic and forward calorimetry in the region from |η| = 1.5 to |η| = 4.9. In the first LHC run a total luminosity of 27 fb−1 has been collected at center-of-mass energies of 7-8 TeV. After detector consolidation during a long shutdown, Run-2...
The LHC is expected to increase its centre-of-mass energy to 14 TeV and to keep longer time with an instantaneous luminosity of about 2.0x10^34 cm^-2s^-1 for Run-3 scheduled from 2021 to 2024. In order to cope with the high event rate, upgrades of the ATLAS trigger system are required. The level-1 endcap muon trigger system identifies muons with high transverse momentum by combining data from...
The discovery of the Higgs boson in 2012 marked an important point in modern science, confirming more than 40 years old theoretical prediction. All measurements so far suggest that the properties of the new found boson are in agreement with the Standard Model. Since it is known that the SM is not a complete theory, a hunt is on to find any deviation which could point to a new theory and the...
ATLAS is the first LHC collaboration releasing data recorded at 13 TeV centre-of- mass energy. Billions of real events that correspond to proton-proton collisions recorded in 2016 are accompanied by several orders of magnitude more events of simulated samples of Standard Model processes and New Physics hypothetical processes. We intend to show the development of this open educational project...
The ATLAS experiment at the Large Hadron Collider is collecting unprecedented amounts of proton–proton collision data. The ATLAS Collaboration analyses these data, seeking to give answers to questions that have puzzled particle physicists for many decades now. In this process, the Standard Model is being precisely measured and searches for new physics are performed in sophisticated and clever...
The Tile Calorimeter (TileCal) is the central section of hadronic calorimeter of the ATLAS experiment at the LHC. This sampling device uses steel plates as absorber and scintillating tiles as active medium and its response is calibrated to electromagnetic scale by means of several dedicated calibration systems.
The accurate time calibration is important for the energy reconstruction,...
The Virtual Visit service run by the ATLAS Collaboration has been provided since 2010. The ATLAS Collaboration has used this popular and effective method to bring the excitement of scientific exploration and discovery into classrooms and other public places around the world. The programme, which uses a combination of video conferencing, webcasts, and video recording to communicate with remote...
Educational games and activities have proven benefits for achieving learning objectives. They motivate competition, provide immediate rewards for success, and encourage collaborative, problem-based learning - all while framed as a fun activity, rather than laborious task. An overview of ATLAS educational games is given, including: “Making a Splash”, a water-balloon game teaching the physics of...
Cosmic Rays (CR) impinging on the terrestrial atmosphere provide a viable opportunity to study new physics in hadron-nucleus collisions at energies covering many orders of magnitude, including a regime well beyond LHC energies.
The flux of primary CR is well studied and can be used to estimate event rates for a given type of new physics scenario. As a step to estimate the potential for new...
We evaluate axial vector transition form factors in holographic QCD models that have been shown to reproduce well recent experimental and theoretical results for the pion transition form factor. Comparing with L3 data on f1→γγ∗ we find remarkable agreement regarding the shape of single-virtual form factors, while deviating, in the double-virtual case, from a simple dipole model used previously...
The Belle II detector was completed with the installation of a silicon vertex detector
that covers most of the solid angle around the interaction region. In 2019 Physics Run
before summer shutdown, 5.15 /fb of data were collected at a center of mass energy
corresponding to the mass of the Y(4S). We utilize this dataset to characterize the
performance of the detector about tracking of...
Many searches for physics beyond the Standard Model make use of large radius jets to reconstruct hadronically decaying electroweak bosons or top quarks with high transverse momenta. Algorithms have been developed in ATLAS that take advantage of the different radiation pattern within the large radius jet depending on the initiating particle to efficiently reject quark- or gluon-initiated jets...
CALET (CALorimetric Electron Telescope) is a space instrument in operation on the JEM-EF external platform of the ISS where it has been collecting an average of about 20 million events per month since October 2015. Designed to carry out direct measurements of high energy cosmic-ray and gamma radiation, CALET addresses a number of long-standing open questions including the origin of cosmic...
The Deep Underground Neutrino Experiment (DUNE) is an international collaboration focused on studying neutrino oscillation over a long baseline (1300 km). DUNE will make use of a near detector and O(GeV) neutrino beam originating at Fermilab in Batavia, IL, and a far detector operating 1.5 km underground at the Sanford Underground Research Facility in Lead, South Dakota. The near and far...
Many physics analyses using the Compact Muon Solenoid (CMS) detector at the LHC require accurate, high resolution electron and photon energy measurements. Excellent energy resolution is crucial for studies of Higgs boson decays with electromagnetic particles in the final state, as well as searches for very high mass resonances decaying to energetic photons or electrons. The CMS electromagnetic...
The planned upgrade of the ALICE Inner Tracking System (ITS) aims at improving the capabilities of ALICE
in terms of read-out rate as well as track pointing resolution and track finding efficiency, especially for particles
with low transverse momenta. The new ITS will be a low material budget detector with high granularity and read-out speed. It comprises seven concentric layers of...
The MuTe is a hybrid muon telescope used for density imaging of volcanos by means of measurements of the atmospheric muon flux attenuation depending on the amount of rock crossed at different angles. The detector will be placed at one of the most dangerous volcanoes in Colombia, the Cerro Machin volcano, located in the South-West of Colombia. MuTe hodoscope reconstructs 3841 different...
We argue that quantum electrodynamics combined with quantum gravity results in a new source of CP violation, anomalous non-conservation of chiral charge and quantisation of electric charge. Further phenomenological and cosmological implications of this observation are briefly discussed within the standard model of particle physics and cosmology
Eight years ago, the discovery of a new fundamental particle, the Higgs boson (H), was announced by the ATLAS and CMS Collaborations at CERN. Since then, a great effort has been focused on measuring the Higgs boson decays to vector bosons, heavy quarks and leptons. While the most frequent decay modes have now been successfully observed, the light quark sector remains widely unexplored. The...
The Compact Muon Solenoid (CMS) detector is one of the two multi-purpose experiments at the Large Hadron Collider (LHC) and has a broad physics program. Many aspects of this program depend on our ability to trigger, reconstruction and identify events with final state electrons, positrons, and photons with the CMS detector with excellent efficiency and high resolution.
In this talk we...
The CMS experiment selects events with a two-level trigger system, the Level-1 (L1) trigger and the High Level trigger (HLT). The HLT reduces the rate from 100 kHz to about 1 kHz and has access to the full detector readout and runs a streamlined version of the offline event reconstruction. In Run 2 the peak instantaneous luminosity reached values above 2X 10^34 cm-2 sec-1, posing a challenge...
We present the methods and performance of jet and missing transverse momentum reconstruction in CMS. The latest reconstruction and calibration procedures for Run2 data are summarized and an outlook to the new techniques foreseen (online and offline) for Run3 is given. Among the most critical new event reconstruction techniques developed by CMS for LHC Run 2 and Run 3 are pileup mitigation...
The efficient and precise reconstruction of charged particle tracks is crucial for the overall performance of the CMS experiment. During the LHC Run 2, significant upgrades were made to the track reconstruction algorithms, both to accommodate the high pileup environment and the installation of an upgraded pixel detector in 2017. Performance measurements of the track reconstruction both in...
Advances in information and communications technologies (ICTs) have given rise to innovative uses of web-based video tools for global communication, enhancing the impact of large research facilities, including their outreach and education programmes. As an example, the CMS Virtual Visits programme launched by the CMS collaborations at CERN, uses videoconferencing to communicate with schools...
The ATLAS Tile Calorimeter (TileCal), as a substantial part of the hadronic calorimeter system of the ATLAS detector, records energy deposits and jointly with other calorimeters reconstructs hadrons, jets, tau-particles and missing transverse energy. It also assists in muon identification. The TileCal is the hadronic sampling calorimeter, which is constructed out of alternating iron absorber...
The most precise measurements of Higgs boson cross sections, using the framework of simplified template cross sections, are obtained from a combination of the measurements performed in the different Higgs boson decay channels. This talk presents the combined measurements, as well as their interpretation.
The CMS Collaboration has been developing a Gas Electron Multiplier (GEM) detector in the endcap regions of the CMS muon system to maintain the high level of performance achieved during Run 2 in the challenging environment of the High Luminosity phase of the LHC (HL-LHC). The GEM chambers at endcap station 1 (GE1/1) have been installed in the second long shutdown. The technical and operational...
A core objective of the ATLAS Collaboration is the communication of the status and achievements of the ATLAS Experiment. ATLAS has tailored its communication strategy to match an ever-changing media landscape, producing content that effectively targets key audiences effectively across multiple platforms. The most recent additions and improvements to ATLAS communications strategy are explored,...
Mass-split composite Higgs models naturally accommodate the experimental observation of a light 125 GeV Higgs boson and predict a large scale separation to other heavier resonances. We explore the SU(3) gauge system with four light (massless) and six heavy (massive) flavors by performing numerical simulations. Since the underlying system with degenerate and massless ten flavors is infrared...
Taking into account the mass gap between the Standard Model (SM) and possible new particles, the use of effective field theories is appropriate. We adopt here the non-linear realization of the electroweak symmetry breaking: the electroweak effective theory (EWET), also known as Higgs effective field theory (HEFT) or electroweak chiral Lagrangian (EWChL). At higher energies we assume a...
The most precise measurements of Higgs boson single and double Higgs production cross sections are obtained from a combination of measurements performed in different Higgs boson production and decay channels. While double Higgs production can be used to directly constrain the Higgs boson self-coupling, the latter can be also constrained by exploiting higher-order electroweak corrections to...
Constraints on the Higgs boson self-coupling are set by combining the single Higgs boson analyses targeting the γγ, ZZ, WW, tau+tau- and bb decay channels and the double Higgs boson analyses in the bbbb, bbtau+tau- and bbγγ decay channels, using data collected at sqrt(s)=13 TeV with the ATLAS detector at the LHC. With the assumption that new physics affects only the Higgs boson self-coupling...
The dipole anisotropy of ultra-high energy cosmic rays above 8 EeV detected by the Pierre Auger Observatory indicates an extragalactic origin of these particles. However, both the direction and the amplitude of the dipole of cosmic rays outside our Galaxy might be different than the one observed on Earth due to the effects of the Galactic magnetic field. We present an analysis of effects of...
One of the key issues of the search for the $K_L\to \pi^0\nu\bar{\nu}$ decay mode is to suppress the backgrounds to the signature with only two photons from the $\pi^0$ in the final state. We use an electromagnetic calorimeter and hermetic veto counters in the KOTO experiment at J-PARC. The calorimeter is made of 50 cm-long undoped CsI crystals stacked in a 1.9 m-diameter cylinder. Each...
The single-phase liquid argon TPC at CERN (ProtoDUNE-SP) is an engineering prototype for the first module of the DUNE far detector. This prototype which has dimensions of a cube of about 10m edge, provide full validation of the use of the membrane tank technology for large dimension cryostats. Furthermore, the very high performance of the protoDUNE-SP TPC with more than 500 days of continuous...
The Deep Underground Neutrino Experiment (DUNE), a 40-kton fiducial mass underground liquid argon time projection chamber experiment, will be sensitive to the electron-neutrino-flavor component of the burst of neutrinos expected from the next Galactic core-collapse supernova. Such an observation will bring unique insight into the astrophysics of core collapse as well as into the properties of...
With the upgraded beam luminosity in LHC run-3, the detector technology for the
innermost end-cap muon station (Small Wheel) of the ATLAS detector needs to be upgraded. The new technology should be able to meet the demands of better position resolution, high efficiency, fast response at the expected high background rate. The detectors for precision tracking and triggering at the New Small...
Scalar fields are widely used in cosmology, in particular to emulate dark energy, for example in quintessence models, or to explain dark matter, in particular within the fuzzy dark matter model. In addition many scenarios involving primordial scalar fields which could have driven inflation or baryogenesis are currently under scrutiny. Here we study the impact of such scalar fields on Big-Bang...
We consider specific examples of ${\cal N} = 2$ supersymmetric quantum mechanical models and list out all the novel symmetries. In each case, we show the existence of two sets of discrete symmetries that correspond to the Hodge duality operator of differential geometry. Thus, we are able to provide a proof of the conjecture which endorses the existence of more than one discrete symmetry...
Scientific developments have seen reality dissolved into smaller and
smaller invisible particles that the physicist has to make
visible. This journey, from something hidden to something revealed, is
mirrored by the artist attempting to express thoughts and emotions
through the manipulation of materials in visual arts, or the movements
of the human body in dance. This -- potentially...
High-statistics, precision measurements by AMS of the daily cosmic-ray electron fluxes from May 2011 to December 2018 are presented. Detailed comparison of these fluxes with the daily fluxes of other cosmic rays measured by AMS results in several new and surprising observations.
We explore the potential astrophysical signatures of dark matter
(DM) annihilations in ultracompact dwarf galaxies (UCDs) considering two of the richest known galaxy clusters within 100 million light-years, nominally, Virgo and Fornax. Fornax UCD3 is the most luminous UCD and M59 UCD3 is the most massive UCD. With the detection of a 3.5 million solar mass black hole (BH) in Fornax UCD3, we...
The ALICE Collaboration at the LHC is made up of around 1900 people from 39 countries. This talk will discuss the composition of the Collaboration in terms of gender, geography, and career status. The distribution of responsibilities among various demographic groups will also be presented, and the time evolution of these statistics will be explored.
A class of relativistic solutions for compact cold objects with strange quark matter in a pseudo-spheroidal space-time is presented here. Considering strange matter equation of state namely, $p = \frac{1}{3}(\rho-4B)$, where $\rho$, $p$ and $B$ are energy density, pressure and MIT Bag parameter respectively, stellar models are obtained. Stellar models are explored where the Bag parameter...
The data acquisition system of Belle II is designed for a sustained first-level trigger rate of up to 30 kHz at the design luminosity of the SuperKEKB collider. The raw data read out from the subdetector frontends is delivered in realtime into an online High Level Trigger (HLT) farm, consisting of up to 20 computing nodes housing around 5000 processing cores. The HLT then reconstructs the...
The physics reach and feasibility of the Future Circular Collider (FCC) with centre of mass energies up to 100 TeV and unprecedented luminosity has delivered a Conceptual Design Report early 2019. The new energy regime opens the opportunity for the discovery of physics beyond the standard model. Proton-proton collisions at 100 TeV will produce very high energetic particle showers in the...
A Muon Collider represents a possible option for the next generation of high-energy collider machines.
Among the technological challenges in the realization of such a machine, the mitigation of the beam-induced background is one of the most critical issues for the detectors.
At the desired luminosity the muons decay rate is very high, beam decay products and subsequent particles from...
Since the detection of neutrinos emitted by the supernova SN 1987A, no neutrinos from other supernovae have been observed to date.
The Jiangmen Underground Neutrino Observatory (JUNO) will be capable of measuring the neutrino burst from a galactic supernova explosion. High statistics, a low detection threshold and an excellent energy resolution will strongly constrain the details of the...
The Penetrating particle ANalyzer is an instrument designed to operate in space to precisely measure and monitor the flux, composition, and direction of highly penetrating particles of energy ranging from 100 MeV/n to 20 GeV/n filling the current observational gap in this energy interval.
The detector design is based on a modular magnetic spectrometer of small size and reduced power...
The High Luminosity upgrade of Large Hadron Collider (HL-LHC) will increase LHC Luminosity by an order of magnitude increasing the density of particles on the detector by an order of magnitude. For protecting the inner detectors of experiments and for monitoring the delivered luminosity, a radiation hard beam monitor is being developed. We are developing a set of detectors based on...
The Circular Electron Positron Collider (CEPC) has been proposed as a Higgs/Z0 (flavor) factory, which would allow precision measurements of the Higgs boson properties, as well as of W±/Z0 bosons. The baseline design of CEPC vertex system consists of three concentric double-sided pixel layers, to reach the unprecedented impact parameter resolution. Driven by physics studies and experimental...
To meet new TDAQ buffering requirements and withstand the high expected radiation doses at the high-luminosity LHC, the ATLAS Liquid Argon Calorimeter readout electronics will be upgraded. The triangular calorimeter signals are amplified and shaped by analogue electronics over a dynamic range of 16 bits, with low noise and excellent linearity. Developments of low-power preamplifiers and...
The MIP Timing Detector (MTD) of the Compact Muon Solenoid (CMS) is designed to provide precision timing information (with resolution of ~40 ps per layer) for charged particles, with hermetic coverage up to a pseudo-rapidity of |η|=3. This upgrade will reduce the effects of pileup expected under the High-Luminosity LHC (HL-LHC) running conditions and brings new and unique capabilities to the...
Belle II is an international collaboration that has over 1000 members
from institutions in 26 countries. In 2018 Belle II created two posts
of diversity officers, to raise awareness of diversity and inclusion
issues, promote an inclusive atmosphere within the collaboration,
provide a safe and confidential point to contact for collaborators to
report any issues, particularly those related...
The Belle II collaboration comprises over 1000 international high energy
physicists, who investigate the properties of b-quarks and other
particles at the luminosity frontier.
In order to achieve our aim of a successful physics program, it is essential that we enable contributions from a diverse community, whether that be diversity in gender, sexuality, or disability, to name a few.
2018...
The CMS collaboration, one of the largest collaborations in high-energy physics, formed a Diversity Office (DO) under a mandate from its collaboration board in 2017. We present here the efforts of the CMS DO in fulfilling its mandate to improve diversity and inclusion (D&I) within the CMS Collaboration. These efforts include tracking and analyzing statistics about CMS demographics,...
One of the main aspects of physics beyond the standard model is the concept of extra dimensions. Among many extra dimensional models the so called Randall-Sundrum model in which a single brane with positive tension is embedded in a five-dimensional anti-de Sitter (AdS) spacetime, that is infinite in the direction perpendicular to the brane is of particular interest. In this work we use the...
Early career researchers in particle physics face a unique set of challenges. Newcomers to any experiment face steep learning curves, particularly with the familiarisation of software and internal standard procedure. The junior rank typical of early career researchers can also mean less agency or influence within a larger collaboration, and job insecurity brings further additional challenges,...
The experimental area of the Trento Proton Therapy Center (Italy) is a experimental area devoted to research on particle physics sensors and biophysics. In this area particle physics sensors can be tested with a proton beam with a energy range between 70 and 130 MeV.
This area is also specially suitable for education initiatives addressed to both students or general public because in this...
We develop a formal framework for constructing tree-level effective actions for $A_\infty$ and $L_\infty$ string field theories using the ideas of homological perturbation theory. We apply our results to obtain effective actions for massless fields at finite momentum in a large class of both bosonic and superstring backgrounds, making use of a novel propagator to account for integrating out...
Many analyses in ATLAS rely on the identification of jets containing b-hadrons (b-jets) at high efficiency while rejecting more than 99% of non-b-jets. Identification algorithms, called b-taggers, exploit b-hadron properties such as their long lifetime, their high mass, and high decay multiplicity to achieve this. Recently developed ATLAS b-taggers using neural networks are expected to...
We present exact solutions to the electroweak Cho-Maison magnetic monopole in a family of effective extensions of Standard Model that have a Bogomol’nyi-Prasad-Sommerfield (BPS) limit. We find that the lower bound to the mass of the magnetic monopole is $M \geq 2\pi v/ g \approx 2.37\,\,\mathrm{TeV}$. We argue that this bound holds universally, not just in theories with a BPS limit.
We describe electroweak monopoles within the Born-Infeld extension of $𝑆𝑈(2)\times 𝑈(1)$ electroweak theory. We argue for topological stability of these monopoles and computed their mass in terms of the Born-Infeld mass parameters. We then propose a new mechanism for electroweak baryogenesis which takes advantage of the following salient features of the electroweak monopoles: (i) monopoles...
Phenomenologically relevant electroweak precision pseudo-observables related to the Z-boson physics are discussed in the context of strong experimental demands of future e+e- colliders.
The recent completion of two-loop Z-boson results is summarized and a prospect for the 3-loop SM calculation of the Z-boson decay pseudo-observables is given.
The single-phase liquid argon prototype at CERN (ProtoDUNE-SP) acts as a validation of the design for the DUNE single-phase far detector. With a total mass of 770 tons, it is the largest monolithic liquid argon single-phase time projection chamber in the world. ProtoDUNE-SP collected test-beam in autumn of 2018 and has been collecting cosmic and special calibration data since the end of 2018....
Less than five years have passed since the first detection of a gravitational-wave signal, on September 14th, 2015. Yet, the status of the field has changed drastically, with a growing number of detections made by a global network of ground-based interferometric detectors with unprecedented sensitivities and high duty cycles. A truly new window onto the Universe, symbolized by multi-messenger...
The rapid economic growth is building new trends in careers. Almost every domain, including high-energy physics, needs people with strong capabilities in programming. In this evolving environment, it is highly desirable that young people are equipped with computational thinking (CT) skills, such as problem-solving and logical thinking, as well as the ability to develop software applications...
With the explosion of the number of distributed applications, a new dynamic server environment emerged grouping servers into clusters, utilization of which depends on the current demand for the application. To provide reliable and smooth services it is crucial to detect and fix possible erratic behavior of individual servers in these clusters. Use of standard techniques for this purpose...
EUSO-SPB2 (Extreme Universe Space Observatory on a Super Pressure Balloon II) is a precursor mission for a future space observatory for multi-messenger astrophysics. This mission is the continuation of the JEM-EUSO science program on ultra-long duration balloons, started with the EUSO-SPB1.
The EUSO-SPB2 will host onboard two telescopes. One is a fluorescence telescope designed to detect...
Event plane determination with the new ALICE FIT detector
The Fast Interaction Trigger (FIT) [1] is one of the new detectors being constructed for the upgrade of the ALICE experiment at CERN. FIT is a thoroughly modernized design, combining the functionality of four detectors used by ALICE during the LHC Run 2: the T0, V0, AD and FMD. During the upcoming LHC Run 3 and 4, in addition to the...
The ATLAS Collaboration consists of more than 5000 members, from about 100 different countries. This study presents data showing aspects of the regional, age and gender demographics of the collaboration, including the time evolution over the lifetime of the experiment. In particular the relative fraction of women is discussed, including their share of contributions, recognition and positions...
Prototypes of electromagnetic and hadronic imaging calorimeters developed and operated by the CALICE collaboration provide an unprecedented wealth of highly granular data of hadronic showers for a variety of active sensor elements and different absorber materials. In this presentation, we discuss detailed measurements of the spatial and the time structure of hadronic showers to characterise...
After the discovery of a Higgs boson, the measurements of its properties are at the forefront of research. The determination of the associated production of a Higgs boson and a pair of top quarks is of particular importance as the ttH Yukawa coupling is large and can probe for physics beyond the Standard Model. The analysis is based on data taken by the ATLAS experiment recorded from 13 TeV...
A simple, efficient, safe to use but also affordable fast neutron spectroscopy system is of paramount importance for many scientific and industrial communities. 3He based detectors provide a solution that fulfils most of the requirements but its high demand in combination with its scarcity created a worldwide shortage and efforts are focused on finding an alternative solution. A number of...
We investigate the prospects for discovering a top quark decaying into
one light Higgs boson ($h^0$) along with a charm quark
in top quark pair production at the CERN Large Hadron Collider (LHC)
and future hadron colliders.
A general two Higgs doublet model is adopted to study the signature
of flavor changing neutral Higgs (FCNH) interactions with $t \to c h^0$,
followed by $h^0...
The LHCb Collaboration is planning an Upgrade II, a flavour physics experiment for the high luminosity era. This will be installed in LS4 (2030) and targets an instantaneous luminosity of 1.5 x10^34 cm-2 s-1, and an integrated luminosity of at least 300fb-1. Consolidation of the current experiment will also be introduced in LS3 (2025). Physics goals include probing new physics scenarios in...
The first LHCb upgrade will take data at an instantaneous luminosity of 2E33cm^{-2}s^{-1} starting in 2021. Due to the high rate of beauty and charm signals LHCb has chosen as its baseline to read out the entire detector into a software trigger running at the LHC collision frequency of 30MHz. This High Level Trigger will enable unprecedented flexibility for trigger selections. In this talk we...
One of the main challenges for the LIGO-Virgo Observation Run 3 (O3), 12 months of data taking plus a 1-month commissioning break between April 2019 and April 2020 – was to deliver reliable and timely public alerts to a large community of astronomers looking for counterparts of the gravitational-wave candidate signals. In this talk, I will describe the way such public alerts have been...
The gamma or hard X-ray imaging is used in applications such as: medical SPECT or PET, radiation monitoring, back-scatter imaging. The key requirement in this field is high detection sensitivity and ability to use all information recorded for each registered quantum.
The state-ot-the-art particle tracking hybrid detector of Timepix3 type (256 x 256 pixels, 55 µm pitch, spectral and temporal...
Determining the spin of any particle and measuring its couplings to other particles and/or itself are crucial in reconstructing the structure of any theory containing the particle. A general helicity formalism is employed to describe the polarization of the particle $Y$ in a two-body decay $X_2\to YX_1$ with polarized $X_2$ for diagnosing the dynamical properties of the three involved...
We describe a novel method of generating magnetic fields in cosmic string wakes from neutrino currents. We show that neutrino currents act as a cross-perturbation across the cosmic string wake. This cross perturbation along with the high Reynolds number generates a magnetic field in the wake of the cosmic string. The neutrino current is generated by the neutrinos rotating around the Abelian...
The upgrade of the Large Hadron Collider (LHC) to the High Luminosity LHC (HL-LHC) is required to probe the physics beyond Standard Model. After the ongoing long shutdown (LS2) and eventually after LS3 in 2026, the accelerator luminosity will be increased up to 7 times as compared to designed luminosity value i.e. 1034 cm-2s-1. To meet the requirements of higher rates environment of HL-LHC...
The study of astrophysics context of massive theory leads to the black hole heat engine may be regarded as a possible energy source of the high energy astrophysical phenomena. Therefore, a black hole engine may be regarded as a possible source of power gamma rays and ultrahigh energy cosmic rays. Propose of this research was study to heat engine provided by black holes in presence of cyclic...
Jet reconstruction, identification and classification is of prime interest in an hadronic environment such as the LHC. Algorithms were developed in order to separate jets emerging from the decay of charm and bottom quarks, and to identify large jets produced from the decays of heavy resonances. In Run 2, such algorithms have benefited from the use of increasingly complex deep neural network...
Data Analysis Methods from High Energy Particle Physics (HEP) have applications well beyond fundamental research or the obvious industrial use cases. We would like to present the results of two project together with the UNICEF hosted End Violence Against Children (EVAC) Global Partnership and the Terre des Hommes (TdH) Innovation Prize project ChildHub. We used HEP data analysis inspired...
The most recent CMS results on Higgs boson properties from the combination of different final states will be presented, including the Higgs boson mass, couplings, and interpretations in the context of effective field theories extending the standard model.
Recent measurements from the CMS collaboration on Higgs boson fiducial and differential cross sections will be presented.
The High-Luminosity Large Hadron Collider (HL-LHC) is expected to deliver an integrated luminosity of up to 3000 fb-1. The very high instantaneous luminosity will lead to about 200 proton-proton collisions per bunch crossing (“pileup”) superimposed to each event of interest, therefore providing extremely challenging experimental conditions. Prospects for measurements of the properties of the...
Recent measurements of Higgs boson properties in the diphoton channel from CMS will be presented.
The most recent CMS results on Higgs boson measurements in final states with tau leptons will be presented.
Recent CMS measurements of Higgs boson properties in hadronic final states will be presented.
Having the second highest branching ratio, the decay of the Higgs boson into two W bosons is one of the most promising channels to study the CP properties of the Higgs boson, couplings of Higgs to the other particles as well as inclusive and differential cross-section measurements. It is the only analysis sensitive to the forward Higgs production with pseudorapidities of the Higgs boson above...
The most recent measurements of Higgs boson properties in the H->WW and H->ZZ channels at CMS will be presented.
The Higgs boson pair production via gluon fusion at high-energy hadron colliders, such as the LHC, is vital in deciphering the Higgs potential and in pinning down the electroweak symmetry breaking mechanism. We carry out the next-to-next-to-next-to-leading order (N3LO) QCD calculations in the infinite top-quark mass limit. Such corrections are indispensable in stabilising the perturbative...
The measurement of Higgs boson production in association with a ttbar pair is essential to understand the top-quark couplings to the Higgs boson. This talk presents the analyses using Higgs boson decays to bbbar pairs, to two Z bosons, to other multi-lepton final states, and to a pair of photons, using pp collision data collected at 13 TeV.
We present new calculations of the differential decay rates for
$H\to \ell^+\ell^- \gamma$ with $\ell=e$ or $\mu$ in the Standard
Model. The branching fractions and forward-backward asymmetries, defined
in terms of the flight direction of the photon relative to the
lepton momenta, depend on the cuts on energies and invariant masses
of the final state particles.
...
Precision measurements and searches for new phenomena in the Higgs
sector are among the most important goals in particle physics. The
large circular e+e- collider FCC-ee will provide collisions up to an
energy of 365 GeV, with extremely high luminosities. These
collisions will allow the ultimate precision on studies of the Higgs
boson couplings, mass, total width and CP parameters, as...
Very high energy proton-proton collisions (up to 100 TeV) provided by the FCC-hh will produce several 10^10 Higgs bosons. This will allow high precision measurements of the Higgs boson rare decays such as H-> \mu\mu, Z~\gamma, \gamma~\gamma, of the Higgs coupling to the top quark and of the Higgs self-coupling. There is a remarkable complementarity of the FCC-ee and FCC-hh colliders, which in...
Higgs production cross sections at LHeC (FCC-eh) energies are as large as (larger than) those at future $Z-H$ $e^+e^-$ colliders. This provides alternative and complementary ways to obtain very precise measurements of the Higgs couplings, primarily from luminous, charged current DIS. Recent results for LHeC and FCC-eh, as contained in the 2020 LHeC White paper, are shown and their combination...
Muon collisions at multi-TeV center-of-mass energies are ideal for studying the Higgs-boson properties.
The number of produced Higgs bosons will allow to measure its couplings to fermions and bosons with an unprecedented precision. At $\sqrt{s}$ of the order of or greater than 10 TeV the double (triple) Higgs-boson production rate will be sufficiently high to directly measure the parameters...
The Compact Linear Collider (CLIC) is a mature option for a future electron-positron collider operating at centre-of-mass energies of up to 3 TeV. CLIC would be built and operated in a staged approach with three centre-of-mass energy stages currently assumed to be 380 GeV, 1.5 TeV, and 3 TeV. This presentation focusses on unique opportunities at the multi-TeV stages in the area of Higgs...
With the continued down scaling of devices and structure changed to 3-dimensional, new engineering processes are in great demand. Microwave surfatron plasma is considered new plasma source because it enables very low-temperature deposition and good quality due to its low electron temperature and higher plasma density. For adopting surfatron plasma source to new vacuum chamber, it is essential...
The Sustainable Development Goals (SDGs) of the United Nations as well as the Environmental, Social and corporate Governance (ESGs) are central factors in measuring the sustainability and societal impact of an action or an investment. Following research on sustainable investment with the Global Humanitarian Lab (GHL) we are analysing partnerships and collaborations between United Nations...
The High-Luminosity LHC will open an unprecedented window on the weak-scale nature of the universe, providing high-precision measurements of the Standard Model as well as searches for new physics beyond the standard model. The Compact Muon Solenoid (CMS) experiment is planning to replace entirely its trigger and data acquisition system to achieve this ambitious physics program. Efficiently...
The next generation of collider detectors will make full use of Particle Flow algorithms, requiring high precision tracking and full imaging calorimeters. The latter, thanks to granularity improvements by 2 to 3 orders of magnitude compared to existing devices, have been developed during the past 15 years by the CALICE collaboration and are now reaching maturity. The state-of-the-art status...
There are some universally acknowledged problems in school sciences. Across the developed countries worldwide, young people are not interested in studying STEM-subjects. Whether that is because of perceived lack of personal relevance, disconnect from the actual fields of study, "sanitized" school practices or other factors is up to debate, but it is eminently clear that as educators we have to...
The LHC at CERN plans to have a series of upgrades to increase its instantaneous luminosity to 7.5×1034 cm−2s−1. The luminosity increase drastically impacts the ATLAS trigger and readout data rates. The inner-most station of the ATLAS muon spectrometer, the so-called Small Wheels, will be replaced with a New Small Wheel (NSW) system, consisting of Micromegas (MM) and sTGC detectors, which is...
The quantum field theoretical description of coherence in the oscillations of particles, especially neutrinos, is a standing problem in particle physics. In this talk, several inconsistencies of the standard approach to particle oscillations will be explained, and how they are resolved in a process-independent manner, by a novel approach inspired by the Bardeen-Cooper-Schrieffer theory of...
The ATLAS upgrade for the HL-LHC phase involves the construction of two New Small Wheel (NSW) for addressing the high rate expected at high rapidity, up to 20 kHz/cm2. The wheels will be equipped with two different technologies, small-strips Thin Gap Chambers (sTGC) and Micromegas (MM), with both tracking and triggering capabilities. About 70% of the MM chambers for the first wheel have been...
The poster will describe the U-120M cyclotron facility at the Nuclear Physics Institute of the Czech Academy of Sciences and parameters of the provided beams.
The facility is extensively used for tests of radiation hardness of various electronic components for high-enegy physics including silicon sensors and FPGAs. The poster will present a dedicated setup that is used for these irradiation...
Hadronic signatures are critical to the ATLAS physics program and many Standard Model measurements and searches for new physics are dominated by the uncertainties on the jet energy scale and resolution or the jet mass scale and resolution. The procedure of calibrating jets in ATLAS using both simulation and in situ techniques will be presented for both anti-kt R = 0.4 and R = 1.0 jets. The...
The JHU generator framework includes an event generator of anomalous HVV and Hff interactions of the Higgs boson in production and decay and a MELA library for matrix element analysis. This framework allows constraints on dimension-six operators of an effective field theory from a joint analysis of on-shell and off-shell production of the Higgs boson and of triple and quartic gauge boson...
Large size multi-gap resistive strips Micromegas have been chosen together with the small-strips TGC (sTGC) to be mounted on the New Small Wheel (NSW) upgrade of the ATLAS Muon Spectrometer. The NSW is the most ambitious and challenging upgrade of the ATLAS experiment for LHC-Phase1 (the current long shutdown) and will exploit its full capabilities after the Phase2 upgrade of LHC when the...
The `Laser-hybrid Accelerator for Radiobiological Applications', LhARA, is conceived as a novel, uniquely flexible facility dedicated to the study of radiobiology. The technologies that will be demonstrated in LhARA have the potential to allow particle-beam therapy to be delivered in a completely new regime, combining a variety of ion species in a single treatment fraction and exploiting...
As nuclear and high energy facilities around the world are upgraded and move to higher and higher intensities, the detectors in use at these facilities must become more radiation tolerant. Diamond is a material in use at many facilities due to its inherent radiation tolerance and ease of use. We present the results of recent radiation tolerance measurements of the highest quality...
The success of the CMS physics program at the HL-LHC requires maintaining sufficiently low trigger thresholds to select processes at the electroweak scale. With an average expected 200 pileup interactions, critical to achieve this goal while maintaining manageable trigger rates is in the inclusion of tracking information in the Level-1 (L1) trigger. A 40 MHz silicon-based track trigger on the...
Embracing diversity in all its facets is key to doing good science. Building a career in physics is not just about doing your office work. It also includes cooperation with colleagues, networking, travelling to research conferences and collaboration meetings. The LGBTQ community faces concerns, extra burdens and impediments which make it difficult to explore the Universe without limits and...
During Run 2, LHC delivered instantaneous luminosities of $\approx 10^{34}$ cm$^{-2}$ s$^{-1}$ at $\sqrt{s}=13\; {\rm TeV}$. This permitted monitoring of the luminosity over a time granularity as short as $60\;{\rm s}$, using the counts of $Z\rightarrow \ell \ell$ events reconstructed by selecting two, well-idenfitied high $p_T$ electrons or muons in the invariant mass range of $66 < m_{\ell...
Many physics measurements made by the ATLAS experiment at the LHC require a precise measurement of the integrated luminosity of the data sample. This talk will describe the ATLAS luminosity measurement for the full Run-2 dataset, including the absolute calibration of the luminosity scale using the van der Meer scan technique in dedicated LHC running, the extrapolation of this calibration to...
Silicon trackers are used extensively in high energy physics experiments. e.g. in ATLAS and CMS experiments at LHC, Belle II experiment at KeK. A common feature in these tracking systems is that they have multiple layers of silicon detectors. As charged particles pass through the silicon sensors, ionization gives rise to signal in individual channels of each detector. Hits in multiple layers...
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. This talk presents measurements of differential cross sections in Higgs boson decays to two photons or to four leptons. Furthermore, the measurement of the Higgs boson mass and constraints on the width are presented.
With the rapidly increasing proton-proton collision data-set recorded by the ATLAS experiment at the LHC, one gains access to Higgs bosons produced with ever higher transverse momenta. Measurements in this phase space are well motivated by a vast variety of BSM models which predict effects that scale with the square of the involved energy scale. The associated production of a Higgs boson H...
A measurement of the ttH production in the di-photon decay channel is performed using pp collision data at a center-of-mass energy √s = 13 TeV, recorded by the ATLAS experiment at the LHC. Two regions are defined to target either the fully hadronic or semi-leptonic decay of the top quark. In each, a boosted decision tree (BDT) is trained to create ttH enhanced categories. The measurement is...
The most important pillar in the physics case of future electron-positron colliders in high energy physics is the measurement of the Higgs boson, with its main goal to precisely measure the its properties and to probe potential of associated new physics. All next generation electron positron facilities in high energy physics will make use of the Higgstrahlung Higgs production channel. The...
Organic liquid scintillator (LS) is a common choice for detectors precisely measuring energy of electron antineutrinos. Accurate knowledge of the relation between scintillation light response and the energy deposited by a particle is essential for determination of the antineutrino energy. The response is not exactly linear. Deviation from the LS linearity is the subject of the presented...
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. This talk presents measurements of Higgs boson properties using Higgs boson decays to two photons, two Z bosons, and two W bosons, including production mode cross sections and simplified template cross sections.
The accumulation of positive ions in a LArTPC located on the surface can distort the electric field and the reconstructed particle trajectories. It is critical to understand and correct for the space charge effects in order to achieve the desired spatial and calorimetric resolutions in the LArTPC. This talks will present the measurement of space charge effects using cosmic ray muons in ProtoDUNE-SP.
The thus far only observed coupling of the Higgs boson to leptons is that to tau leptons. Its coupling strength is measured using decays of Higgs boson into two tau leptons in the gluon-fusion and vector-boson-fusion production channels. A measurement of the coupling of the Higgs boson to a pair of τ leptons is presented. The application of machine-learning techniques in this channel is...
The production of the Higgs boson in association with a pair of top quarks is studied in final states with multiple leptons using proton-proton collision data collected by the CMS experiment a $\sqrt s$ = 13 TeV centre-of-mass energy, during the Run 2 of the LHC. Machine learning and matrix element techniques are used to enhance the sensitivity of the analysis by discriminating signal and...
In this presentation, we review a measurement of the CP quantum number of the Higgs boson in its decay to tau leptons via an analysis of the angular correlation between the tau decay planes. The theory behind this analysis and an explanation of some of the methods used for this measurement can be found in [1] and [2].
The analysis targets the full Run 2 data set of proton-proton collisions...
We report the new properties of the flux of Iron nuclei with rigidity from 2 GV to 3 TV based on data collected by the Alpha Magnetic Spectrometer during its first 7 years of operation on the International Space Station.
Testing the couplings of the Higgs boson to fermions is an important part to understand the origin of fermion masses. The talk presents cross section measurements in Higgs boson decays to two b quarks, as well as interpretations of the measurements. It also presents a search for Higgs boson decays to two c quarks. Both analyses are based on pp collision data collected at 13 TeV.
The results of the most recent searches for anomalous Higgs boson couplings at CMS will be presented, including probes for CP violation in the Higgs boson interactions.
Testing the couplings of the Higgs boson to leptons is important to understand the origin of lepton masses. This talk presents measurements of Higgs boson production in Higgs boson decays to two tau leptons based on pp collision data collected at 13 TeV, as well as studies of the CP-nature of the HVV coupling in H→tautau decays.
The average lifetime of cosmic rays in the Galaxy related with their confinement within the Galactic propagation halo, is a very important parameter to understand comic-ray propagation processes and the cosmic-ray origin. The measurement of the 10Be/9Be secondary isotopes ratio, as 10Be has half-life of 1.39 million years, can be used to constrain the propagation lifetime. The 6Li/7Li ratio,...
Luminosity measurements in ATLAS are provided primarily by LUCID detector, but rely on other detectors for determining the systematics associated with this measurement. The Tile Calorimeter, the central hadronic calorimeter at the ATLAS experiment, plays an especially important role because the Tile luminosity measurement is independent of pileup, a feature shared with the Track counting...
Deuterons represent about 1% of the charge 1 nuclei in the cosmic rays flux. They are produced in the large part by spallation reactions of primary cosmic 4He nuclei on the interstellar medium, and represent a very sensitive tool to verify and constrain CR propagation models in the galaxy. Given the smaller cross section for 4He->D with respect C->B the deuteron flux provides additional...
Recent CMS measurements of ttH and tH associated production in multiple final states will be presented.
The precise measurement of the luminosity is one of the key requirements for every ATLAS analysis at the Large Hadron Collider (LHC) at CERN. Particularly in high precision experiments, the uncertainty on the luminosity can be one of the main limitations. Therefore, its reduction is the prime goal of the ATLAS luminosity program, requiring a precise understanding of the contributing factors....
Silicon pixel detectors are at the core of the current and planned upgrade of the ATLAS detector at the Large Hadron Collider (LHC). As the closest detector component to the interaction point, these detectors will be subjected to a significant amount of radiation over their lifetime: prior to the High Luminosity LHC (HL-LHC), the innermost layers will receive a fluence of 1-5 10^15 1 MeV...
Neutron monitors are recognized as a key tool for studying the time variations of galactic cosmic rays, especially with regard to solar effects. Cosmic-ray detectors inside the atmosphere do not record cosmic ray particles directly. The so-called primary cosmic rays interact with nuclei in the atmosphere to produce secondary daughter products. Neutron monitors record predominantly the...
Multi-messenger astrophysics has emerged over the past decade as a distinct discipline, providing unique insights into the properties of high-energy phenomena in the Universe. The Pierre Auger Observatory, located in Malargüe, Argentina, is the world’s largest cosmic ray detector and is sensitive to photons, neutrinos and hadrons at ultra-high energies. Using its data, stringent limits on...
The muon g-2 Experiment at Fermilab measures the anomalous magnetic moment, $a_\mu$, with improved precision compared to the previous experiment at Brookhaven National Lab.
The greater than 3 standard deviations difference between Standard Model prediction and the previous BNL, $a_\mu$, measurement hints at the possibility of new physics. Positive polarized muons are circulated in the storage...
Muon reconstruction and identification play a fundamental role in many analyses of central importance in the LHC run-2 Physics programme. The algorithms and the criteria used in ATLAS for the reconstruction and identification of muons with transverse momentum from a few GeV to the TeV scale will be presented. Their performance is measured in data based on the decays of Z and J/ψ to pair of...
Cosmic muon data accumulated by the NOvA neutrino detector, located 100m underground at Fermilab, allows for study of geological and man-made structures directly contributing to the overburden of the detector. We present results of a muon radiographic analysis of the cosmic ray data, obtained without subtracting the surface muon flux (free sky data). Instead, we use the internal geometrical...
The Compact Muon Solenoid (CMS) detector is one of the main experiments of the Large Hadron Collider (LHC). Many aspects of its broad physics program rely on our ability to trigger, reconstruct and identify events with muons in a wide range of momenta, from a few GeV to the TeV scale. We study the performance of muon identification and isolation in CMS in pp collision data at 13 TeV recorded...
MURMUR is a new passing-through-wall neutron experiment installed near the BR2 nuclear reactor at the Belgian Nuclear Research Center (SCK.CEN, Mol, Belgium) and designed to search neutron interbrane transitions in the context of braneworld scenarios. In such scenarios, our Universe could be a 3-brane embedded in a multidimensional Universe, called the bulk, which could contain many other...
Detectors based on Chemical Vapor Deposition (CVD) diamond have been used successfully in beam conditions monitors in the highest radiation areas of the LHC. Future experiments at CERN will to accumulate an order of magnitude larger fluence. As a result, an enormous effort is underway to identify detector materials that will operate after fluences of >10^{16}/cm^2.
Diamond is one candidate...
The CMS experiment makes use of a large variety of algorithms to identify the origin of particle jets measured in the detector. Through the study of jet substructure properties, jets originating from quarks, gluons, W/ Z/Higgs bosons, top quarks and pileup interactions are discriminated. We present new techniques based on machine learning approaches developed for LHC Run 2 and Run 3 that...
Neon, Magnesium, Silicon, and Sulfur nuclei in cosmic rays are thought to be mainly of primary origin, they are mainly produced and accelerated in astrophysical sources. We report the latest precise measurements of the Ne, Mg, Si, and S individual spectra in the rigidity range from 2 GV to 3 TV by the Alpha Magnetic Spectrometer based on the data collected during its first 7 years of...
We present precision high statistics measurements of primary cosmic rays protons, Helium, Carbon and Oxygen and the secondary cosmic rays Lithium, Beryllium and Boron measured by Alpha Magnetic Spectrometer on ISS in the rigidity range from 2 GV to 3 TV.
These measurements are based on more than one billion nuclei collected by AMS during first 7 years of operation from May 2011 to May 2018....
Scintillating crystal calorimeters provide unparalleled resolution in measuring the energy of electromagnetic particles. Recent experiments performed at CERN and DESY beamlines by the AXIAL/ELIOT collaboration demonstrated a significant reduction in the radiation length inside PbWO$_4$, the material used for the CMS ECAL, observed when the incident particle trajectory is aligned with a crystal...
To help boost the number of women entering physics careers, the well-established program International Masterclasses is holding special events on the UN International Day of Women and Girls in Science (Feb 11). Girls aged 15-19 participate in a Masterclass under the supervision of female facilitators, who serve as role models. Particle Physics Masterclasses, organized by the International...
The main physics motivation of Belle II experiment is to probe the New Physics beyond the Standard Model and precise measurement of CP violation, CKM parameters by heavy quark/lepton flavor decays as well. The SuperKEKB e+e- Collider at KEK in Japan has been started beam collision from 2018 to collect Belle II physics data. The Electromagnetic CaLorimeter (ECL) trigger system was very crucial...
We will first review the amplitudes of single Galileon theories with focus on the soft theorems. Both tree-level and one-loop level amplitudes will be studied. Generalization of multiflavour extension will be briefly discussed.
The ANTARES neutrino telescope and other experiments are searching for more detailed information on the previously observed shifted high-energy neutrinos from the gamma-ray bursts travelling through interstellar space. Many theoretical models have been proposed to explain this phenomenon, based on assuming the Lorentz-invariance violation. In this talk I shall show that the dispersion...
The tracking performance of the ATLAS detector at the Large Hadron Collider (LHC) at CERN relies critically on its 4-layer Pixel Detector, consisting of four barrel layers at 33, 50.5, 88.5, and 122.5 mm from the geometric center of the ATLAS detector and a total of six disk layers, three at each end of the barrel region. It has undergone significant hardware and readout upgrades to meet the...
To maintain and improve physics performance under the harsher conditions of the high luminosity LHC phase from 2026, the CMS collaboration has designed a novel endcap calorimeter that uses silicon sensors to achieve radiation tolerance, with the additional benefit of a very high readout granularity. In regions characterised by lower radiation levels, small scintillator tiles with individual...
The Belle II experiment aims to collect 50 ab$^{-1}$ of e$^{+}$e$^{-}$ collision data at the SuperKEKB collider in Japan. The first collisions with the full Belle II detector were recorded in Spring 2019. Excellent performance of the innermost pixel vertex detector (PXD) is crucial for many high profile B-decay measurements, namely those which rely heavily on precise knowledge of decay...
The PPS (Precision Proton Spectrometer) detector system consists of silicon tracking stations as well as timing detectors to measure both the position and direction of protons and their time-of-flight with high precision. They are located at around 200 m from the interaction point in the very forward region on both sides of the CMS experiment. PPS is built to study Central Exclusive Production...
The single-phase liquid argon prototype at CERN (ProtoDUNE-SP) is designed to act as a testbed and prototype for the elements of the first far detector module of DUNE. ProtoDUNE-SP collected data in the H4-VLE beamline at CERN in the autumn of 2018 and accumulated 4M particles (electrons, muons, pion, kaons and protons) ranging from 0.3 to 7 GeV/c and a large number of cosmic ray events since...
Resistive Plate Chambers (RPCs) are gaseous ionisation detectors that are employed by the Level-1 muon trigger system in the barrel region of the ATLAS muon spectrometer. The Level-1 muon trigger system selects muon candidates that are produced in proton-proton collisions at the Large Hadron Collider (LHC). Muon candidates are associated by the Level-1 system with the correct LHC bunch...
The Tile Calorimeter (TileCal) is a sampling hadronic calorimeter covering the central region of the ATLAS experiment, with steel as absorber and plastic scintillators as active medium. The scintillators are read-out by the wavelength shifting fibres coupled to the photomultiplier tubes (PMTs). The analogue signals from the PMTs are amplified, shaped, digitized by sampling the signal every 25...
The CMS Level-1 (L1) Trigger system was upgraded in 2016 in order to cope with the three fold increase in peak luminosity of Run 2 compared to Run 1. The upgraded trigger features advanced clustering, calibration, and particle identification techniques. More sophisticated algorithms, for example involving the invariant mass of pairs of L1 candidates, were also implemented. The upgrades reduced...
The LHCb experiment is a flavour physics detector, designed to study decays of b and c hadrons for measurements of CP violation and rare decays. Its performance is based on precision tracking and particle-identification systems. In order to accomplish its wide program of physics measurements, the LHCb collaboration has developed in the past years a set of algorithms for reconstruction of the...
The CMS detector at the LHC has recorded events from proton-proton collisions, with muon momenta reaching up to 1.8 TeV in the collected dimuon samples. These high-momentum muons allow direct access to new regimes in physics beyond the standard model. Because the physics and reconstruction of these muons are different from those of their lower-momentum counterparts, this talk presents for the...
The SoLid collaboration operates since 2018 a 1.6 ton neutrino detector near the Belgian BR2 reactor, with as a main goal the search for observation of the oscillation of electron anti-neutrinos to previously undetected flavor states.
The highly segmented SoLid detector employs a novel compound scintillation technology based on PVT scintillator in combination with a LiFZnS screens containing...
The small-strip Thin-Gap Chambers (sTGC) will be used as both trigger and precision tracking muon detectors for the Phase-I upgrade of the ATLAS New Small Wheel (NSW) muon detector for HL-LHC runs. The frontend electronics are implemented in about 2000 boards including the 4 custom-designed ASICs capable of driving trigger and tracking primitives to the backend trigger processor and readout...
Resistive Plate Chamber (RPC) detectors are widely used thanks to their excellent time resolution and low production cost. At the CERN LHC experiments, the large RPC systems are operated in avalanche mode thanks to a Freon-based gas mixture containing C2H2F4 and SF6, both greenhouse gases with a very high global warming potential (GWP). The search of new environmentally friendly gas mixtures...
The Run 2 ATLAS trigger system is comprised of two levels: a hardware level (L1) and a software higher level trigger (HLT). Between late 2018 and early 2021, the ATLAS trigger system is undergoing upgrades. Two major sets of upgrades to the ATLAS level 1 trigger system will be the increase in read-out granularity in the LAr detectors ("supercells") and the addition of new Feature EXtractors...
One of the most important experimental programs that will address some of the open questions in neutrino physics is the Deep Underground Neutrino Experiment (DUNE). It will be the first mega-science project on the US sole, which involves more than 1000 physicists. It will perform measurements of the CP violation in the leptonic sector, the neutrino mass hierarchy and on the θ23 octant. The...
A team based around CERN in Geneva has organised public engagement and education activities at a variety of non-scientific venues. The core team now brands itself the Big Bang Collective, and local partners are engaged in each case, bringing in local knowledge and expertise. The principle recurring festivals that have been targeted are the WOMAD Festival (Charlton Park, UK, since 2016), joined...
In the beginning of 2021, the upgraded LHCb experiment will use a triggerless readout system collecting data at an event rate of 30 MHz. During the first stage of High-Level Trigger (HLT1), a sub-set of the full offline track reconstruction for charged particles is run to select particles of interest based on single or two-track selections. After this first stage, the event rate is reduced by...
Hard-scatter processes in hadronic collisions are often significantly contaminated by background contributions from pileup in proton-proton collisions or underlying event in heavy-ion collisions. It is crucial to mitigate this background since it has a significant impact on hadronic jet reconstruction and on the ability to identify the substructures of hadronically decaying boosted...
As one of the tracking devices that made the particle physics' history a spark chamber with its visualization capability provides a perfect opportunity to bring science closer to the public, especially to high school students. Given that, in general, it is not a tool as common as cloud chamber in the outreach activities and apparently no such a device is used for these purposes in the Czech...
Light dark sector particles, especially bosons if coupled to the inflaton can be copiously produced during the (p)reheating epoch courtesy to Bose enhancement. In many particle physics scenarios such light particles are often invoked to resolve tensions with cosmological bounds from Big Bang Nucleosynthesis (BBN), Cosmic Microwave Background (CMB) and Large Scale Structure (LSS). We will...
The CMS experiment at the LHC is equipped with a high granularity lead tungstate crystal electromagnetic calorimeter (ECAL) offering an excellent energy resolution. The ECAL was crucial in the discovery and subsequent characterization of the Higgs boson, particularly in the two photon and two Z boson decay channels. The LHC has reached an unprecedented luminosity during Run 2 (2016-2018),...
Precision luminosity calibration is critical to determine fundamental parameters of the standard model and to constrain or to discover beyond-the-standard-model phenomena at LHC. The luminosity determination at the LHC interaction point 5 with the CMS detector, using proton-proton collisions at 13 and 5.02 TeV during Run 2 of the LHC (2015–2018), is reported. The absolute luminosity scale is...
The High Luminosity upgrade of the LHC (HL-LHC) is foreseen to increase the instantaneous luminosity by a factor of five to seven times the LHC nominal design value. The resulting, unprecedented requirements for background monitoring and luminosity measurement create the need for new high-precision instrumentation at CMS, using radiation hard detector technologies. This contribution presents...
Cosmic Rays (CR) inside the Heliosphere are subject to the effects of the Solar Modulation, resulting from their interaction with the solar wind and with the interplanetary magnetic field. These effects are strongly related to the solar activity and lead to a temporal variation of the cosmic ray intensity near Earth for rigidities up to few tens of GV. Previous AMS results on proton and helium...
The spectral shape of the secondary isotopes in cosmic rays is completely determined by the source spectrum of the parent elements and by the propagation process. In particular, 3He in cosmic rays is believed to result from the interaction of primary 4He with the interstellar medium, providing a powerful tool to constrain the parameters of the galactic cosmic rays propagation models. Precise...
The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive Phase II upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). A new timing detector in CMS will measure minimum ionizing particles (MIPs) with a time resolution of ~30-40 ps and hermetic coverage up to a pseudo-rapidity of |η|=3. The precision...
Higgs sector of the Standard model (SM) is replaced by the gauge $SU(3)_f$ quantum flavor dynamics (QFD) with scale $\Lambda$. Anomaly freedom demands addition of three right-handed neutrinos $\nu^f_{R}$. The QFD Schwinger-Dyson equation for fermion self-energies $\Sigma_f(p^2)$ spontaneously generates:
(I) three Majorana masses $M_{fR}$ of $\nu^f_{R}$ of order $\Lambda$; (II) three...
The Electron-Ion Collider (EIC) will be built to address fundamental questions
which include the origin of the nucleon spin, space and momentum distribution
of partons inside nucleons, interaction of jets in nuclear medium and the dynamics
of the gluon density at high energies.
In this talk we present an overview of the Interaction Region (IR) design for the EIC.
The design takes into...
Athena is the software framework used in the ATLAS experiment throughout the data processing path, from the software trigger system through offline event reconstruction to physics analysis. The shift from high-power single-core CPUs to multi-core systems in the computing market means that the throughput capabilities of the framework have become limited by the available memory per process. For...
Primordial black holes (PBHs) constitute an attractive candidate for dark matter. I will describe a new generic mechanism for PBH formation from fragmentation of scalar fields. Then, I will revisit PBH formation from vacuum bubbles during inflation and show how resulting broad PBH mass-spectrum can simultaneously account for dark matter, reported HSC candidate, LIGO events as well as seeds of...
Primordial Black Holes (PBHs) are appealing candidates for dark matter in the universe but are severely constrained by theoretical and observational constraints. I will focus on the Hawking evaporation limits extended to Kerr Black Holes. These results have been obtained with a new code entitled BlackHawk that I will briefly present. In particular, I will review the isotropic extragalactic...
The characteristics of an extensive air shower derive from both the mass of the primary ultra-high-energy cosmic ray that seeds its development and the properties of the hadronic interactions that feed it. With its hybrid detector design, the Pierre Auger Observatory measures both the longitudinal development of showers in the atmosphere and the lateral distribution of particles arriving at...
The spectroscopy of charmonium-like mesons with masses above the 2_mD open charm threshold has been full of surprises and remains poorly understood [1]. The currently most compelling theoretical descriptions of the mysterious XYZ mesons attribute them to hybrid structure with a tightly bound cc\bar diquark [2] or cq(cq)\bar tetraquark core [3 - 5] that strongly couples to S-wave DD\bar...
Sterile neutrinos with mass in the eV-scale and large mixings
of order θ_0 ≃ 0.1 could explain some anomalies found in
short-baseline neutrino oscillation data. We consider
a neutrino portal scenario in which eV-scale sterile neutrinos
have self-interactions via a new gauge vector boson φ. Their
production in the early Universe via mixing with active
neutrinos can be suppressed by the...
Left-right symmetry at high energy scales is a well-motivated extension of the Standard Model, which has been scrutinized over the past few decades, chiefly in context of collider experiments. In my talk I will present a complementary approach and investigate whether the model can be probed via the search for a stochastic gravitational wave background induced by the left-right phase...
The muon system of the ATLAS Experiment will be upgraded in 2021 with Micromegas detectors covering an active area of about 1280 m2, being the largest system based on Micro Pattern Gaseous Detector (MPGD) ever built so far. The key element of the detectors are the anode boards which carry the readout strips, the resistive protection layer and the insulating pillars supporting the mesh. In...
Michael R. Foley (mrf@incomusa.com), Melvin Aviles, Satya Butler, Till Cremer, Camden D. Ertley, Cole J. Hamel, Alexey V. Lyashenko Michael J. Minot, Mark A. Popecki, Michael E. Stochaj, Travis W. Rivera, Incom, Inc, Charlton, MA, USA; Evan J. Angelico, Henry J. Frisch, Andrey Elagin, Eric Spieglan, University of Chicago, Chicago IL, USA; Bernhard W. Adams, Dragonfly Devices, Naperville,...
If there are light axions in nature they will very probably leave a cosmic background, just like neutrinos. In this work we complete the study of thermal axion production above the QCD Phase Transition (QCDPT) by including the scatterings of the axion with the longitudinal components of the W and Z bosons. We study the predictions for pa4ticular QCD axion scenarios, like the KSVZ and the...
ATLAS electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential to record signals for a wide variety of physics: from Standard Model processes to searches for new phenomena. During Run 3 (2021-2024) main triggers used for those physics studies will be a single-electron trigger with ET threshold around 25 GeV and a diphoton trigger with thresholds at 25...
In October 2017, IFIC (joint center of CSIC and the University of Valencia) launched the Office of Young Researchers, Gender and Diversity (Jóvenes Investigadores, Género y Diversidad, JIGD). The main objective of this pioneering initiative is to try to eliminate the discrimination or harassment that may take place in the Institute, ensuring equal opportunities for all its members and favoring...
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....
The Deep Underground Neutrino Experiment (DUNE) will use large liquid argon (LAr) detector consisting of four modules, each with a fiducial mass of 10 ktons of LAr. One of the technology options for the far detector modules is a liquid-argon Time Projection Chamber (TPC) working in Dual-Phase mode. In a Dual-Phase TPC, ionisation charge deposited in the liquid argon volume is drifted towards...
We report the detailed measurement of the daily proton and helium fluxes in eigth years with the Alpha Magnetic Spectrometer on the International Space Station. The period of observation covers half solar cycle from the ascending phase through the maximum going toward the minimum. The high resolution time variation of the fluxes and sub-structures associated to the strongest solar events, are...
The minimal realistic SO(10) model with adjoint representation causing GUT symmetry breaking is appealing candidate for realistic Grand Unified Theory. Moreover, the model allows one to make significant improvement in the proton lifetime error estimates due to the suppression of the potential gravitational effects influencing the GUT scale physics. We tackled the comprehensive numerical study...
Proton Computed Tomography (pCT) makes it possible to render 3D images of the human body like traditional x-ray Computed Tomography (CT), with the advantage of a much lesser dose delivered to the patient (1% to 10% respect to a traditional CT) and a far more accurate tissue density discrimination (i.e. the capability to map the different dE/dx stopping power of different tissues). The...
Measuring lepton angular distributions of Drell-Yan process provides a powerful tool to explore the reaction mechanisms and the parton distributions of colliding hadrons. For example, the Lam-Tung relation has been proposed as a benchmark of the pQCD effect in Drell-Yan process. Violations of Lam-Tung relation were observed in the measurements of fixed-target experiments as well as...
Our immediate familiar natural world as well as the universe beyond, are "quantum-entangled" from the microscopic to the macroscopic scale, from the "inner" to the "outer" dimensions. This fundamental "quantum entanglement" can be harnessed to sense and probe extremely "weak" processes in nature around us, to create novel materials and to probe and sense signals left over from the very "early"...
The expected increase in simultaneous collisions creates a challenge for accurate particle track reconstruction in High Luminosity LHC experiments. Similar challenges can be seen in non-HEP trajectory reconstruction use-cases, where tracking and track evaluation algorithms are used. High occupancy, track density, complexity and fast growth therefore exponentially increase the demand of...
RAADsat (Rapid Acquisition Atmospheric Detector) is a three unit Cubesat mission that will be launched in the first quarter of 2021 and deployed from the International Space Station. The mission will target Terrestrial Gamma Ray Flashes (TGF), sudden bursts of gamma-ray radiation occurring on sub-millisecond timescales, and triggered by lightning or thunderstorms. RAADsat is sensitive to...
The upgrade of tracking detectors for experiments at the HL-LHC and future colliders requires the development of novel radiation hard silicon sensors. We target the replacement of hybrid pixel detectors with Depleted Monolithic Active Pixel Sensors (DMAPS) that are radiation hard monolithic CMOS sensors. We designed, manufactured and tested DMAPS in the TowerJazz 180nm CMOS imaging technology...
In this talk, we will present an overview of the LHCb trigger during Runs I and II, including real-time calibration of the detector, and detail plans for the trigger to be used during Run III of the experiment. For Run III data-taking, the level-0 hardware trigger used in the previous runs has been removed, requiring the first stage of the software trigger to process events at the LHC...
In high-energy physics experiments, online selection is crucial to select interesting collisions from the large data volume. ATLAS b-jet triggers are designed to identify heavy-flavour content in real-time and provide the only option to efficiently record events with fully hadronic final states containing b-jets. In doing so, two different, but related, challenges are faced. The physics goal...
The latest CMS results on the Higgs boson decays to a W boson pair are presented. The focus of the poster are the inclusive and differential cross section measurements performed using the full Run2 data collected by the CMS detector at LHC, as well as the constraints on the Higgs boson couplings to fermions and vector bosons arising from the simultaneous measurement of different production mechanisms.
The ANTARES detector is the first Cherenkov neutrino telescope realised in the Mediterranean sea. It is continuously taking data since 2007, with the primary aim to detect astrophysical neutrinos in the TeV-PeV range. A very good angular resolution in all flavour neutrino interaction channels, together with the depth of the abyssal site (2500 m below the sea level) led to an ...
The magnetic field around the Earth traps electrons and protons of energy 0.1-100 MeV. The dynamics of these particles is influenced by solar activity and the impact of intense geomagnetic storms on communication systems and infrastructures is widely recognised. So far, space weather models have been mostly based on data from electromagnetic probes, plasma probes and low-energy particle...
The Time of Propagation (TOP) detector is a novel particle
identification system developed for the barrel region of the Belle II
detector at the SuperKEKB collider at KEK in Tsukuba, Japan. Cherenkov
photons generated by charged particles traversing its quartz radiator
are captured due to total internal reflection. The Cherenkov emission
angle is then reconstructed from the propagation...
We study a bottom-up construction of effective field theories of spin-0 and spin-1 massless particles using the infrared structure of scattering amplitudes. We try to employ previously discovered two distinct probes of soft kinematics: multiple chiral soft limits for vectors and enhanced single soft limits for scalars.
A search for a light charged Higgs boson (H+) decaying to a W boson and a CP-odd Higgs boson (A) using trilepton final states (electron-dimuon or trimuon) is presented. The result is based on data from pp collisions at 13 TeV, recorded by the CMS detector, corresponding to an integrated luminosity of 35.9 /fb. In this search, it is assumed that the H+ boson is produced in decays of top quarks,...
The latest results on production of Higgs boson pairs at 13 TeV by the ATLAS experiment are reported, including a combination of six different decay modes. Results include bbtautau, bbbb, bbgamgam, bbWW, WWWW and WWgamgam final states, and they are interpreted both in terms of sensitivity to the SM and as limits on kappa_lambda, a scaling of the triple-Higgs interaction strength.
A search for decays of the Higgs boson in the final state with two leptons (electrons or muons) and a photon produced in pp collisions at a center-of-mass energy of 13 TeV with the ATLAS detector is presented. Estimates of Higgs boson signal and background contributions are performed for the three-body invariant mass distribution of the di-lepton plus photon system. Background estimates and...
While the Standard Model (SM) predicts a branching ratio of the Higgs boson decaying to invisible particles of O(0.001), the current measurement of the Higgs boson coupling to other SM particles allows for up to 30% of the Higgs boson width to originate from decays beyond the SM (BSM). The small SM-allowed rate of Higgs boson decays to invisible particles can be enhanced if the Higgs boson...
A search for lepton flavour violating (LFV) decays of the Higgs boson to a muon and a tau, denoted as $\mu\tau$ and an electron and a tau, denoted as $e\tau$ will be presented. A dataset of $137 fb^{-1}$ of proton-proton collisions collected by the CMS detector in Run II, at a center-of-mass energy of $\sqrt{s}=13TeV$ is being used to perform the search. The dominant background contributions...
Several gravitational-wave (GW) events have been observed by the Advanced LIGO and Virgo detectors. Providing a connection between neutrino emission and GW bursts is obviously important for understanding the underlying physical processes associated with GW creation. The Daya Bay Reactor Neutrino Experiment is designed for measuring the neutrino mixing angle theta13 using reactor antineutrinos...
Since the discovery of the 125 GeV Higgs boson at the LHC, studies of the Higgs sector have become an important topic of the ATLAS physics program. There are many potential extensions of the Standard Model (SM) that predict new high-mass states decaying into two photons. Among which, two types of signal models are considered: a spin-0 resonance which was predicted in theories with an extended...
A study of the non-resonant Higgs boson pair production in the four b quarks decay channel is presented. The data analysis is carried out using the full dataset of proton-proton collisions at 13 TeV of center of mass energy, collected by the CMS detector during the 2016-2018 Run-2 LHC data-taking period, corresponding to a total integrated luminosity of 137 fb-1. Both the gluon fusion and...
The Standard Model predicts several rare Higgs boson decay channels, which have not yet been observed, but that could be enhanced in theories beyond the Standard Model. Among these are decays to light leptons, e.g. H→mumu. In addition, theories beyond the Standard Model may predict lepton-flavor violating decays of the Higgs boson. Results for these searches based on full Run-2 dataset...
Latest result from searches for resonances decaying into pairs of Higgs bosons at CMS will be presented, both in resolved and in boosted topologies.
The possibility of observation of the s-channel production e+e- -> H(125) and thus measure the Higgs coupling to the electron at FCC-ee will be reviewed. To this effect, FCC-ee combines three unique properties: i) a high luminosity at sqrt(s) = 125 GeV, ii) the possibility of monochromatization of the center-of-mass using opposite sign horizontal dispersion at the IR, and iii) the possibility...
Since the discovery of the Higgs boson with the mass of about 125 GeV much effort has been spent looking for further scalars, which are motivated in many scenarios. Here we report on searches for new neutral heavy Higgs bosons decaying to pairs of third generation fermions: tau leptons or b quarks. These searches are based on full Run 2 data of the ATLAS experiment at the LHC.
The most recent results from the CMS collaboration on the searches for additional Higgs bosons will be presented, including both neutral and charged Higgs bosons.
Most recent CMS results on searches for Higgs boson decays not expected in the standard model, such as lepton-flavour-violating decays and decays to pairs of new light scalar or pseudoscalar particles, will be presented. Searches for decays with mesons in the final states, expected in the standard model but with extremely small branching ratios, will also be covered.
The most recent results of the searches for rare standard model Higgs boson decays by the CMS collaboration will be presented. Searches for Higgs bosons decaying to invisible particles will also be covered.
In the Standard Model, the branching ratio for Higgs boson decays to invisible final states is very small, but it can be significantly enhanced in extensions of the Standard Model. This talk presents searches for Higgs boson decays to invisible final states with the full run 2 data.
The most recent results of the searches for non-resonant di-Higgs production at CMS will be presented.
The observation of neutrino oscillations indicates that lepton flavour violation (LFV) occurs in nature and that lepton flavour is not an exact symmetry. However, no observation has been made in the charged sector, which would be a clear indication of physics Beyond the Standard Model (BSM). There are BSM models which predict LFV decays of the Higgs boson into a pair of leptons with different...
I will present the prospect of Yukawa production of a light boson which can exist in an extended Higgs sector. A particularly interesting case is the light pseudoscalar in Type-X two Higgs doublet model which can explain the anomalous magnetic moment of muon at large $\tan\beta$. Considering ILC "Higgs factory" with CM Energy of 250 GeV, we show that the available parameter space can be fully...
A search for heavy neutral Higgs bosons is performed using the LHC Run 2 data, corresponding to an integrated luminosity of 139 fb−1 of proton–proton collisions at √s = 13 TeV recorded with the ATLAS detector. The heavy resonance is searched for in the τ+τ− decay mode with at least one τ lepton decaying into final states with hadrons and a neutrino. The search covers the mass range of 0.2–2.5...
The physics aims at the proposed future CLIC high-energy linear e+e- collider pose challenging demands on the performance of the detector system. In particular, the vertex and tracking detectors have to combine a spatial resolution of a few micrometres and a low material budget with a few nanoseconds time-stamping accuracy. For the vertex detector, fine pitch sensors, dedicated 65nm readout...
The Belle II experiment using the SuperKEKB energy-asymmetric e+e- collider at KEK in Japan started physics data-taking from 2018. In the Belle II operation, the Electromagnetic CaLorimeter (ECL) trigger system was very crucial to operate the trigger/DAQ system. The ECL trigger simulation package has been prepared based on the Belle II Geant4-based analysis framework called Basf2. By the...
Micromegas are among the most promising micro pattern gaseous detector (MPGD) technologies for applications in high energy physics (HEP). Micromegas are very versatile. They can be used for precision tracking and trigger, in particle flow calorimetry sampling, as anode planes for RICH detectors or for time projection chambers.
Driven mainly by future upgrades of existing experiments at...
The next supernova in the Milky Way will be a bonanza for astrophysics and fundamental physics. However, since local supernovae are exceedingly rare it will be crucial to capture all possible information in a coordinated multi-messenger effort. The observation of a prompt neutrino burst, expected to occur up to 12 hours before the detection of optical emission, would provide a unique early...
According to the Global Digital Report 2020, social media active users reach 49% of the world population, with an annual growth of 9%. Due to the penetration of social media in everyday life, many scientific collaborations and institutions are present on different social media platforms and recognize the role they play in reaching a wider audience. Social media engagement can positively...
Spreading interest in physics among high-school students is crucial for course and career choices. When investigating interest in science, previous studies focused on four aspects: interesting contents (e.g. mechanics), contexts (e.g. biological), tasks (e.g. conduct an experiment), and learning environments (e.g. Science Centre).
Overall, researchers agree that when trying to arouse...
The Full Event Interpretation (FEI) is an exclusive tagging algorithm, that was developed for the Belle II experiment. By employing multivariate classifiers the FEI can identify and reconstruct semileptonic and hadronic B meson decay cascades with high efficiency. In this talk the status and performance of the FEI using recorded Belle II collision data is presented. Calibration studies of the...
The Belle II DAQ system was completely overhauled as part of the detector upgrade from Belle. The raw detector event data is sent from the custom detector frontends through optical links to unified off-detector readout modules (COPPERs). The raw data of up to nine COPPERs is bundled in one readout server each, which forwards the data through a fully connected event builder switch to the High...
Baikal-GVD is a cubic-kilometer scale underwater neutrino detector being constructed in lake Baikal. It is designed to detect astrophysical neutrino of energies from few TeV to 100 PeV. Deployment started in spring 2015 and in 2019 telescope was operating 5 clusters each consisting of 8 strings holding 288 optical modules spanning from 750 m to 1250 m depths underwater. In the first phase of...
DUNE is a long-baseline neutrino oscillation experiment that will take data in a wideband neutrino beam at Fermilab in the latter half of the 2020s. The experiment is planning to build a very capable near detector to facilitate the high precision extraction of oscillation parameters. Part of the mission of the near detector is to acquire powerful data sets that can be used to constrain the...
As part of the preparations for the LHC Run 3 and 4, the ALICE experiment at CERN is making a thorough upgrade of the setup. In particular, all ALICE subsystems have to cope with the increased interaction rate of 50 kHz in Pb-Pb and up to 1 MHz in pp collisions. Comparing with Run 2, this is up to two orders of magnitude more collisions. The solution for the majority of ALICE detectors is to...
In a transparent bottom-up process, involving a significant part of the HEP community, CERN has defined a strategic R&D programme to address the primary technological challenges of the next generation experiments.
The results of this new R&D programme will be building blocks, demonstrators and prototypes, which will form the basis for possible new experiments and experiment upgrades beyond...
A wide range of gas mixtures is used for the operation of different gaseous detectors at the CERN LHC experiments. Some gases, as C2H2F4, CF4, C4F10 and SF6, are greenhouse gases (GHG) with high global warming potential and therefore subject to a phase down policy affecting the market with price increase and reduced availability.
The reduction of GHG emissions is an objective of paramount...
The Deep Underground Neutrino Experiment (DUNE) will be capable of observing the burst of neutrinos from a nearby core-collapse supernova. The detector will furthermore have the excellent capability for determination of the direction of the supernova via reconstruction of anisotropic interactions in its liquid argon time projection chambers.
This talk will describe studies of DUNE's...
We discuss a 2+1 dimensional model holographically realized as the boundary theory of a four-dimensional gravity model in Anti de Sitter (AdS) spacetime. The result is achieved through suitable boundary conditions for the D=4 fields, and an effective model for massive spin-1/2 fields on a curved background is obtained.
The (unconventional) supersymmetry of the boundary model allows to...
The low-energy effective field theory for electroweak interactions -the so called Higgs Effective Field Theory (HEFT)- is studied in this talk. It embeds the Standard Model as a particular limit and parametrizes new physics deviations. We discuss some experimental resonant diboson searches and four-fermion operators analyses that seem to push the new physics scale well over the TeV. On the...
Following the observation of a Higgs boson by the ATLAS and CMS collaborations, a comprehensive programme of measurements of its properties is underway looking for deviations from the Standard Model (SM) predictions.
It is crucial to determine whether the scalar sector consists of only one weak doublet or whether it has a richer structure including additional states, thus deviating from the...
Inflation as the intersection of cosmology and high energy physics will be studied in this manuscript. Among many inflationary models we consider the one with a logarithmic scale factor, called logamediate inflation. On the other hand, the idea of extra dimensions in cosmology is closely related to high energy physics and here, we are interested in studying the logamediate inflationary...
The recently deployed DeepTau algorithm for the discrimination of taus from light flavor quark or gluon induced jets, electrons, or muons is an ideal example for the exploitation of modern deep learning neural network techniques. With the current algorithm a suppression of miss-identification rates by factors of two and more have been achieved for the same identification efficiency for taus as...
The TORCH time-of-flight detector is designed to provide a 15 ps timing resolution for charged particles, resulting in K/pi (p/K) particle identification up to 10 (15) GeV/c momentum over a 10 m flight path. Cherenkov photons, produced in a quartz plate of 10 mm thickness, are focused onto an array of micro-channel plate photomultipliers (MCP-PMTs) which measure the photon arrival times and...
The ATLAS Forward Proton detectors consists of four horizontal precision trackers, two stations located at 210 m on each side of the ATLAS interaction region. We describe the relative alignment of the four tracker planes in each station and the relative alignment of the stations in each arm. The absolute alignment is done with exclusive di-lepton events and cross-checked with data from survey...
The Time-of-Flight (ToF) detectors of the ATLAS Forward Proton (AFP) system are designed to measure the primary vertex z-position of the pp -> pXp processes by comparing the arrival times measured in the ToF of the two intact protons in the final state.
We present the results obtained from a performance study of the AFP ToF detector operation in 2017. A time resolutions of individual...
The Inner Detector (ID) trigger plays an essential role in the ATLAS trigger system, enabling the high purity reconstruction of physics objects - electron, tau, muon, bjet candidates etc..., providing access to regions of the phase space populated by these objects which span a wide range of kinematic regimes. These are essential for the core physics programme at ATLAS: Standard Model...
Muon triggers are essential for studying a variety of physics processes in the ATLAS experiment, including both standard model measurements and searches for new physics. The ATLAS muon trigger consists of a hardware based system (Level 1), as well as a software based reconstruction (High Level Trigger). The muon triggers have been optimised during Run 2 to provide a high efficiency while...
In view of the ongoing series of LHC luminosity upgrades, the New Small Wheels (NSW) will replace the present innermost stations of the ATLAS endcap Muon spectrometer with new detector assemblies. The aim of the NSW is to maintain the same level of efficiency and momentum resolution of the present detector in the expected higher background level and to keep an acceptable muon trigger rate...
The ATLAS experiment aims to record about 1 kHz of physics collisions. This is achieved by using a two-level trigger system to select interesting physics events while reducing the data rate from the 40 MHz LHC crossing frequency. Events are selected based on physics signatures such as the presence of energetic leptons, photons, jets or large missing energy. The wide physics programme carried...
To answer many questions still open in the field of Ultra-High-Energy Cosmic Rays, the Pierre Auger Collaboration started a significant upgrade of the Observatory, called AugerPrime.
The main goal of the upgrade is to improve the mass composition sensitivity of the surface detector on a shower-to-shower basis, in order to explore the cosmic ray composition at energies above 10$^{19}$eV. At...
The SuperKEKB electron-positron collider at the KEK laboratory in Japan aims to achieve a maximum luminosity 50x higher than its predecessors KEKB and PEPII, positioning the Belle II experiment at the forefront of searches for non-standard-model physics in the next decade. High collision intensity implies high beam-induced radiation, which can damage essential Belle II sub-detectors and...
The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure...
In spring 2019 the fully equipped Belle II experiment started data taking at the energy of the Y(4S) resonance. The new vertex detector (VXD) consists of two inner layers of DEPFET pixels (PXD) and four layers of double-sided silicon strip detectors (SVD). It plays a crucial role in recording high-quality data in the new high-luminosity environment of the SuperKEKB collider, characterized by...
Creating pathways to accelerate gender parity, and inviting more women and girls to science, technology, engineering and mathematics (STEM) continues to be a challenge in today’s world. Large international collaborations are an obvious place where diverse groups work together, embracing differences and celebrating their richness. Therefore, it’s critical that they take steps to combat...
In the CMS endcap region, muon reconstruction in the Level-1 (L1) trigger is not straightforward because of the non-uniform magnetic field, high pile-up and punch-through interactions. However, the new muon detectors and the upgraded trigger processing capabilities proposed for the Phase-2 upgrade will allow the implementation of novel techniques that successfully address these challenges. For...
The luminosity delivered to the experiments by the High Luminosity Large Hadron Collider (HL-LHC) is expected to be at least five times the original design, exceeding the value of 5 × 10^34 cm^−2 s^−1. The detectors will therefore undergo critical upgrades to sustain the higher particle fluxes and improve the tracking and triggering performance. In the current CMS muon system, different...
The CMS high-granularity endcap calorimeter (HGCAL) is a challenging detector that brings together tracking and calorimetry, silicon and scintillators, as well as linear collider detector concepts, to meet the harsh radiation and pileup environment of the High Luminosity LHC Phase (Phase 2) in the forward region and exploit challenging signatures such as VBF/VBS production. The HGCAL features...
The LHC machine is planning an upgrade program which will smoothly bring the luminosity to about $5-7.5\times10^{34}$cm$^{-2}$s$^{-1}$, to possibly reach an integrated luminosity of $3000-4000\;$fb$^{-1}$ over about a decade. This High Luminosity LHC scenario, HL-LHC, starting in 2027, will require an upgrade program of the LHC detectors known as Phase-2 upgrade. The current CMS Outer Tracker,...
The CMS experiment has been designed with a two-level trigger system: the Level 1 Trigger, implemented on custom-designed electronics, and the High Level Trigger, a streamlined version of the CMS oeconstruction software running on a computer farm. During its “Phase 2” the LHC will reach a luminosity of 7X10^34 cm-2 sec-1 with a pileup of 200 collisions, integrating more than 3000 fb-1 over the...
The Data Quality Monitoring (DQM) service is critical in several key aspects of the data analysis for the CMS detector. From the Online world, for real-time detector monitoring, to the detailed checks and fine-grained data analysis in Offline, in order to provide the best possible data quality for Physics analyses. Besides, the DQM software is extensively used to validate reconstruction...
LHCb is a collaboration of over 1300 members from 83 institutions based in 19 countries, and representing many more nationalities. We aim to work together on experimental high energy physics, and to do so in the best and most collaborative conditions. The Early Career, Gender & Diversity (ECGD) office exists to support this goal, and in particular has a mandate to support early-career...
ALICE (A Large Ion Collider Experiment) is one of the four main detectors at CERN LHC. In order to exploit the increased luminosity and interaction rate during the upcoming LHC Run 3 and 4, ALICE is now implementing a significant upgrade of its detectors and systems.
The minimum latency interaction trigger, luminosity monitoring, precision collision time, and determination of centrality and...
Despite numerous recent efforts at colliders and multi-ton scale experiments, there has not been an unambiguous detection of particle dark matter. While progress has been made excluding large regions of parameter space, there remain many viable candidates, some of which can evade collider and direct detection sensitivities. Sub-GeV (50-250 MeV/$n$) cosmic ray antideuterons...
The International Particle Physics Outreach Group (IPPOG) is a network of scientists, science educators and communication specialists working across the globe in informal science education and outreach for particle physics. The primary methodology adopted by IPPOG requires the direct involvement of scientists active in current research with education and communication specialists, in order to...
Since 1984 the Italian groups of the Istituto Nazionale di Fisica Nucleare (INFN), collaborating with the DOE laboratory of Fermilab (US) have been running a two-month summer training program for Italian university students. While in the first year the program involved only four physics students of the University of Pisa, in the following years it was extended to engineering students. This...
The LHCb experiment at the LHC is designed to capture decays of b- and c-hadrons for the study of CP violation and rare decays. It has already had a transformative impact in the field of flavour physics as well as making many general purpose physics measurements in the forward region. At the end of Run-II, many of the LHCb measurements will remain statistically dominated. For this reason the...
The LHCb experiment is a detector at the LHC designed to capture decays of b- and c-hadrons for the study of CP violation and rare decays. At the end of Run-II, many of the LHCb measurements remain statistically dominated. For this reason the experiment is currently being transformed, in the Upgrade I programme, to run at higher luminosity from Run III onwards. The trigger scheme will be...
The detector currently under construction is designed to run throughout Run 3 and 4, after which a further major Upgrade will be implemented to enable the LHCb Upgrade II physics goals. The Upgrade II detector is designed to run at instantaneous luminosities of 2 × $10^{34}cm^{-2}s^{-1}$, an order of magnitude above Upgrade I, and accumulate a sample of more than 300 fb-1. At this intensity,...
Observation Run 3 (O3) is the longest period of data taking for the two Advanced LIGO detectors and the Advanced Virgo detector to date. From April 1st, 2019 to April 30th, 2020, the instruments accumulated 12 months of data, with a 1-month commissioning break in October 2019. In this talk, I will review the performance of the three detectors both separately and within the global network of...
The large scalar neutrino detectors (JUNO, HyperK), need the 20 inch area PMTs as the photo-detection device for their large photocathode coverage and less electronic channels. In 2009, the researchers at IHEP have conceived a new concept of large area PMTs, of which the small MCP units replace the bulky Dynode chain. After several years R&D, the 20 inch MCP-PMT was successfully produced. This...
MicroBooNE is a 100-ton scale liquid-argon time projection chamber (LArTPC) neutrino experiment located on the Booster neutrino beamline at Fermilab. The experiment first started collecting neutrino data in October 2015. The detector, the first in the short-baseline neutrino program at Fermilab, is the longest operating LArTPC to date and plays an important role in a phased program towards the...
The “muon-to-electron conversion” (Mu2e) experiment at Fermilab will search for the Charged Lepton Flavour Violating neutrino-less coherent conversion /mu^-N(A,Z) -> e-N(A,Z) of a negative muon into an electron in the field of an aluminum nucleus. The observation of such physics process would be the unambiguous evidence of the existence of physics beyond the Standard Model. The Mu2e detector...
The CMS experiment has greatly benefited from the utilization of the particle-flow (PF) algorithm for the offline reconstruction of the data. The Phase II upgrade of the CMS detector for the High Luminosity upgrade of the LHC (HL-LHC) includes the introduction of tracking in the Level-1 trigger, thus offering the possibility of developing a simplified PF algorithm in the Level-1 trigger. We...
The ATLAS level-1 calorimeter trigger (L1Calo) is a hardware-based system that identifies events containing calorimeter-based physics objects, including electrons, photons, taus, jets, and missing transverse energy. In preparation for Run 3, when the LHC is expected to run at higher energy and instantaneous luminosity, L1Calo is currently implementing a significant programme of planned...
The vertex detector at Belle II has four outer layers of silicon strip detectors (SVD) and two inner pixel layers (PXD) at a distance of 14 and 22 mm to the interaction point. The PXD is based on DEPFET technology, which combines signal generation and first amplification in a single device and allows for the construction of a very light-weight device. The material budget of a single layer...
Humanitarian and social challenges from the United Nations, Red Cross and Non Governmental Organisations meet HEP expertise at CERN for impactful innovation. THE Port association at CERN combines physicists and engineers working on HEP topics in their day job with researchers, refugees, entrepreneurs, artists, designers, humanitarian workers and other creative minds. In 60-hour hackathons they...
The Micro-Channel Plate (MCP) is a specially crafted microporous plate with millions of independent channels, which have secondary electron emission capability. The MCP could be used as the electronic multiplier amplifier in the PMTs. There are two types of MCP Photomultiplier tube (MCP-PMT), large-area electrostatic focusing PMTs (LPMT) and small size proximity focusing PMTs (FPMT)...
Ultra-high-energy cosmic rays (UHECR), of energy >10 EeV, arrive at the Earth regularly, but their sources, acceleration mechanisms, propagation through the universe, and particle composition remain mysteries. In addition, their interactions with the atmosphere show an unexpectedly high muon flux compared to simulations.
To address these issues, the Pierre Auger Observatory, a hybrid 3000...
We discuss the main features of the scalar sector of a class of BSM models with enlarged gauge symmetry, the so called 331 Models. The theoretical constraints on the scalar potential such as unitarity, perturbativity and boundedness-from-below, are presented, together with the analytical exact digitalization of the scalar sector. The phenomenology of exotic scenarios predicted by the 331...
In the LHCb Upgrade there will be four layers of tracking provided using silicon strips located after the Vertex Locator and in the fringe field in front of the analysis magnet, allowing for a fast determination of track momentum, essential for the software only trigger. We will discuss the design, including novel features such as embedded pitch adaptors and top-side HV bias, as well as...
The sPHENIX experiment is the successor the PHENIX experiment at RHIC and is optimized to study heavy flavor and jets arising from heavy ion collisions. The detector utilizes advanced technologies such as a monolithic active pixel vertex detector while also repurposing technologies originally from other high energy experiments such as BaBar, ATLAS and ALICE. In this talk we will show the...
We present an overview of the phenomenological implications of the theory of resummed quantum gravity. We discuss its prediction for the cosmological constant in the context of the Planck scale cosmology of Bonanno and Reuter, its relationship to Weinberg's asymptotic safety idea, and its relationship to Weinberg's soft graviton resummation theorem. We also discuss constraints and consistency...
LHCb is one of the four main experiments operating at the LHC and it is dedicated to measurements of CP violation and to the search for new physics beyond Standard Model in the rare decays of hadrons containing heavy quarks. Particle identifcation information (PID) at LHCb is provided by two Ring Imaging Cherenkov systems, RICH1 and RICH2.The two LHCb RICH detectors operated at the luminosity...
In a seminal work, Don Page studied the black hole information loss paradox by looking at the entanglement entropy of the black hole-radiation system. That analysis is very general and applicable to every bipartite system. Here, we study that entanglement entropy with the language of Thermo Field dynamics, successfully introduced in black hole physics by W.Israel. We show that entanglement...
Timepix3 detectors are the latest member of the Medipix/Timepix family of hybrid pixel detectors developed at CERN. These detectors feature a segmented detector (256 x 256 pixels, pixel-pitch of 55 µm) flip-chip bump-bonded to the readout ASIC. In each pixel, Time-over-Threshold and Time-of-Arrival are measured simultaneously, while keeping a counting mode capability. The per-pixel dead time...
In the context of the Equivalence Teorem we compute the one-loop contribution of
top and bottom quarks to the would-be Nambu-Goldstone bosons elastic scattering.
We pay attention to the renormalization and unitariry of the amplitude and provide
examples of the applications to the LHC physics.
After a brief review of how to describe the π electrons of Dirac materials and topóligical defects, such as disclinations and dislocations, we propose a scenario where the effects of dislocations, in bidimensional Dirac materials, can be described, at low energies, by a vertex proportional to the totally antisymmetric component of the torsion generated by such dislocations. It is suggested...
Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy (TAIGA) is a complex of cosmic- and gamma-ray detectors covering four orders of magnitude in the TeV-EeV energy range. The cosmic-ray detectors are represented by particle, radio and and non-imaging air-Cherenkov setups covering the area of 3 sq.km., while the gamma-ray facility comprises of non-imaging wide-field...
We present the measurement of the Belle II track reconstruction efficiency and Monte
Carlo efficiency correction factors using τ-pair events, in which one τ lepton decays
leptonically ( τ → lνν , l = e, μ) while the other decays hadronically into three charged
pions ( τ → 3πν + nπ0). These measurements are performed using the e+e-
collision data recorded during the early Phase III of data taking.
The alignment of the CMS muon detector is critical to maintaining accurate position determination of muon hits, thereby affecting momentum resolution and the sensitivity of physics analyses involving muons in the final state. Muon track data from both the muon system and the inner tracker is used to perform a multidimensional fit on the misalignment degrees of freedom. Several new capabilities...
The positions of the nearly twenty-thousands silicon sensors of the CMS central tracking system must be determined with a precision better than their intrinsic resolution in order to provide an optimal reconstruction of charged particle trajectories. The procedure, referred as the alignment, includes also the adjustment of the orientations and the determination of the deviation from flatness...
The identification of jets originating from heavy-flavour quarks (b, c) is central to the LHC physics program. High-performance flavour tagging is necessary both in precise Standard Model measurements and in searches for new physics. To achieve this, distinct characteristics of heavy-flavour decays are exploited, such as the presence of secondary vertices and displaced particles. This requires...
During the High-Luminosity Phase 2 of LHC, scheduled to start in 2026, the ATLAS detector is expected to collect more than 3 $\mathrm{ab}^{-1}$ of data at an instantaneous luminosity reaching up to 7.5×$10^{34}$ $\mathrm{cm}^{−2}.\mathrm{s}^{−1}$, corresponding to about 200 inelastic proton-proton collisions per bunch crossing. In order to cope with the large radiation doses and to maintain...
The Belle II detector was completed with the installation of a silicon vertex detector
that covers most of the solid angle around the interaction region. In 2019 Physics Run
before summer shutdown, 5.15 /fb of data were collected at a center of mass energy
corresponding to the mass of the Y(4S).
We present the measurement of the L1 and high-level trigger efficiencies at Belle II
using the...
The ATLAS experiment at the LHC can record about 1 kHz of physics collisions, out of an LHC design bunch crossing rate of 40 MHz. To achieve a high selection efficiency for rare physics events (such as beyond the Standard Model physics) while reducing the significant background rate, a two-level trigger system is used. The event selection is based on physics signatures, such as the presence of...
The High-Luminosity LHC will open an unprecedented window on the weak-scale nature of the universe, providing high-precision measurements of the Standard Model as well as searches for new physics beyond the standard model. The Compact Muon Solenoid (CMS) experiment is planning to replace entirely its trigger and data acquisition system to achieve this ambitious physics program. Efficiently...
At the Large Hadron Collider, many important searches for new particles and Standard Model measurements probe final states with hadronic jets and missing transverse momentum. Such events are also fundamental for precision calibration. Trigger selection of hadronic events is a extremely challenging due to immense backgrounds. This presentation summarises the implementation of hadronic triggers...
The Higgs trilinear coupling provides a unique opportunity to study the structure of the Higgs sector and probe indirect signs of BSM Physics – even if new states are somehow hidden. In models with extended Higgs sectors, large deviations in the Higgs trilinear coupling can appear at one loop because of non-decoupling effects in the radiative corrections from the additional scalar states. It...
The Tile Calorimeter (TileCal) is a sampling hadronic calorimeter covering the central region of the ATLAS experiment, with steel as absorber and plastic scintillators as active medium. The High-Luminosity phase of LHC, delivering five times the LHC nominal instantaneous luminosity, is expected to begin in 2026. TileCal will require new electronics to meet the requirements of a 1 MHz trigger,...
The ATLAS monitored drift tube (MDT) chambers are the main component of the precision tracking system in the ATLAS muon spectrometer. The MDT system is capable of measuring the sagitta of muon tracks to an accuracy of 60 μm, which corresponds to a momentum accuracy of about 10% at pT=1 TeV. To cope with large amount of data and high event rate expected from the High-Luminosity LHC (HL-LHC)...
The present Level-1 Muon Trigger System of the ATLAS experiment will be upgraded for the HL-LHC to the Level-0 (L0) Muon Trigger with increased trigger latency of 10 ms and output rate of 1 MHz. The longer buffers in the front-end allow for more complex processing of the data, maintaining a high trigger efficiency even at highest event rates. For this purpose, the Sector Logic (SL) boards...
The Large Hadron Collider (LHC) will be upgraded in several phases to significantly expand its physics program, and these upgrades present major challenges to the operations of the CMS cathode-strip-chamber muon system. After the current long shutdown from 2018-2020 (LS2) the accelerator luminosity will be increased to 2 − 3 10^34cm{−2}s{−1}, exceeding the design value of 10^{34}cm^{−2}s^{−1},...
