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9th Edition of the Large Hadron Collider Physics Conference

→ Europe/Paris
Zoom

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Tulika Bose (University of Wisconsin Madison (US)), Dave Charlton (University of Birmingham (GB)), Giovanni Marchiori (APC, IN2P3 and Université de Paris (Paris, France)), Roberto Salerno (Centre National de la Recherche Scientifique (FR))
Description

The Ninth Annual Large Hadron Collider Physics (LHCP2021) conference is planned in Paris online from 7th to 12th June 2021

NEWS (03/11/2021): the LHCP2021 proceedings have been reviewed and are now available  at this URL: https://pos.sissa.it/397/

NEWS (18/10/2021): the LHCP2021 proceedings are currently under review and will appear at this URL: https://pos.sissa.it/397/

NEWS (12/06/2021): the winners of the poster awards and the site selected to host LHCP 2023 have been announced in the closing plenary session

NEWS (28/04/2021): the second bulletin is now available on the conference website (click here)

NEWS (23/04/2021): poster abstracts have been reviewed and acceptance notifications have been sent by e-mail. Information about the poster and poster session formats are available here. More detailed instructions will be sent to the poster presenters by e-mail.

NEWS (22/04/2021): thanks to CERN and IUPAP sponsorships, no fees are required to participate to the LHCP2021 conference. Participants attending the online conference are required to register in order to receive by e-mail the instructions for the video connections.

    The LHCP conference series started in 2013 after a successful fusion of two international conferences, "Physics at Large Hadron Collider Conference" and "Hadron Collider Physics Symposium". The conference programme will be devoted to a detailed review of the latest experimental and theoretical results on collider physics, and recent results of the LHC Run II, and discussions on further research directions within the high energy particle physics community including both theory and experiment sides. The main goal of the conference is to provide intense and lively discussions between experimentalists and theorists in research areas such as the Standard Model Physics and Beyond, the Higgs Boson, Supersymmetry, Heavy Quark Physics and Heavy Ion Physics as well as the recent progress in the high luminosity upgrades of the LHC and future colliders developments.

With great regret we have concluded that the 9th LHCP conference, to be held 7-12 June 2021, will need to be fully online, due to the Covid-19 pandemic and its uncertainties.

The conference will be maintained for the same days, with an adjusted timetable to improve remote participation from around the world, similar to that of the 2020 edition of LHCP. 

 

MAIN DEADLINES
Registration
 
  - opening 12 December 2020 
  - closing 2 June 2021
Poster abstract submission  
  - submission deadline 19 April 2021
  - acceptance notification 23 April 2021 at the latest

Start of the conference

 7 June 2021 12:00
Proceedings submission 20 September 2021
LCHP2021 posters - Presenter availability.pdf
LHCP2021_1stBulletin.pdf
LHCP2021_2ndBulletin.pdf
LHCP2021_online_poster.pdf
LHCP2021 stats.pdf
Contact email
Participants
1030 View full list
  • Mon, June 7
    • Opening Plenary: Highlights from LHC and Experiments
      Conveners: Giovanni Marchiori (APC, IN2P3 and Université de Paris (Paris, France)), Tulika Bose (University of Wisconsin Madison (US))
    • 1:25 PM
      Coffee break
    • Opening Plenary: Highlights from LHC and Experiments II
      Conveners: Bruno Mansoulie (Université Paris-Saclay (FR)), Roberto Salerno (Centre National de la Recherche Scientifique (FR))
    • 3:05 PM
      Coffee break
    • TeV-scale BSM: General BSM
      Conveners: Dr Carl Gwilliam (University of Liverpool (GB)), Seema Sharma (Indian Institute of Science Education and Research (IN)), Yael Shadmi (Technion)
    • BSM - Feebly Interacting Particles: Neutral FIPs and other current experiments
      Conveners: Emma Torro Pastor (Univ. of Valencia and CSIC (ES)), José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES)), Niki Saoulidou (National and Kapodistrian University of Athens (GR)), Dr Vasiliki Mitsou (Univ. of Valencia and CSIC (ES)), Xabier Cid Vidal (Instituto Galego de Física de Altas Enerxías)
    • Electroweak physics: VBS/VBF
      Conveners: Davide Pagani (Deutsches Elektronen-Synchrotron (DE)), Hang Yin (Central China Normal University CCNU (CN)), Joany Manjarres (Technische Universitaet Dresden (DE)), Dr Pietro Vischia (Universite Catholique de Louvain (UCL) (BE))
    • Higgs physics: Session 1
      Conveners: Giuliano Panico (University of Florence and INFN Florence), Kerstin Tackmann (Deutsches Elektronen-Synchrotron (DE)), Meng Xiao (ZJU - Zhejiang University (CN))
    • Detector performance: Session 1
      Conveners: Francesco Prino (Universita e INFN Torino (IT)), Nicole Skidmore (University of Bonn (DE)), Nora Emilia Pettersson (CERN), Phat Srimanobhas (Chulalongkorn University (TH))
    • QCD: Jet substructure and correlations in hadronic final States
      Conveners: Ben Nachman (Lawrence Berkeley National Lab. (US)), Prof. Frank Petriello (Northwestern University and Argonne National Lab), Gabor Veres (Eotvos Lorand University (HU)), Joe Osborn (Oak Ridge National Laboratory), Laura Brittany Havener (Yale University (US))
    • Top physics: Top production
      Conveners: Gauthier Durieux (CERN), Jose Enrique Palencia Cortezon (Universidad de Oviedo (ES)), Maria Moreno Llacer (Univ. of Valencia and CSIC (ES)), Stephen Farry (University of Liverpool (GB))
      Top@LHCP2021.pdf
    • 4:45 PM
      Coffee break
    • Heavy ions: Quarkonium, exotics and other bound states
      Conveners: Dr Alexander Rothkopf (University of Stavanger), Hengne Li (South China Normal University (CN)), Maximiliano Puccio (CERN), Qipeng Hu (Lawrence Livermore Nat. Laboratory (US)), Wei Li (Rice University (US))
    • Joint sessions: BSM and Higgs physics
      Conveners: Carl Gwilliam (University of Liverpool (GB)), Kerstin Tackmann (Deutsches Elektronen-Synchrotron (DE)), Xabier Cid Vidal (Instituto Galego de Física de Altas Enerxías)
      LHC_JointHiggsTop.pdf
    • QCD: Nucleon Structure and Soft QCD
      Conveners: Ben Nachman (Lawrence Berkeley National Lab. (US)), Frank Petriello (Northwestern University and Argonne National Lab), Gabor Veres (Eotvos Lorand University (HU)), Joe Osborn (Oak Ridge National Laboratory), Laura Brittany Havener (Yale University (US))
    • Tools: Theory tools
      Conveners: Andy Buckley (University of Glasgow (GB)), Loukas Gouskos (CERN), Philip Ilten (University of Cincinnati (US)), Sandro Christian Wenzel (CERN), Stefano Carrazza (CERN)
    • Top physics: Interpretations in final state states with top quark
      Conveners: Gauthier Durieux (CERN), Jose Enrique Palencia Cortezon (Universidad de Oviedo (ES)), Maria Moreno Llacer (Univ. of Valencia and CSIC (ES)), Stephen Farry (University of Liverpool (GB))
      Top@LHCP2021.pdf
    • Upgrades: Physics at HL-LHC
      Conveners: Christian Ohm (KTH Royal Institute of Technology (SE)), LianTao Wang (University of Chicago), Magnus Mager (CERN), Saptaparna Bhattacharya (Northwestern University (US)), Silvia Borghi (University of Manchester (GB))
      LHCPInstructions.pdf
      • 68
        Physics prospects ALICE in Run 5 and beyond
        Speaker: Antonio Uras (Centre National de la Recherche Scientifique (FR))
        Alice3_LCHP2021_Uras.pdf
        Recording
      • 69
        Physics with precision timing at HL-LHC with ATLAS and CMS
        Speaker: Christian Ohm (KTH Royal Institute of Technology (SE))
        Ohm_HGTD_LHCP2021.pdf
        Recording
      • 70
        Boosting the physics potential of the HL-LHC ATLAS and CMS experiments with new trigger systems
        Speaker: Swagata Mukherjee (Rheinisch Westfaelische Tech. Hoch. (DE))
        LHCP2021_SM.pdf
        Recording
      • 71
        Physics prospects for LHCb upgrade II
        Speaker: Francesca Dordei (INFN, Cagliari (IT))
        Recording
        upgrade_II.pdf
      • 72
        Testing BSM physics at the HL-LHC
        Speaker: stefania gori (UC Santa Cruz)
        Recording
        TalkLHCp.pdf
  • Tue, June 8
    • Plenary I: Top Physics
      Conveners: Benjamin Fuks (Centre National de la Recherche Scientifique (FR)), Klaus Monig (Deutsches Elektronen-Synchrotron (DE))
    • 2:00 PM
      Coffee break
    • TeV-scale BSM: SUSY
      Conveners: Carl Gwilliam (University of Liverpool (GB)), Seema Sharma (Indian Institute of Science Education and Research (IN)), Yael Shadmi (Technion)
    • BSM - Feebly Interacting Particles: Dark Photons and ALPs; Future experiments
      Conveners: Emma Torro Pastor (Univ. of Valencia and CSIC (ES)), José Francisco Zurita, Niki Saoulidou (National and Kapodistrian University of Athens (GR)), Vasiliki Mitsou (Univ. of Valencia and CSIC (ES)), Xabier Cid Vidal (Instituto Galego de Física de Altas Enerxías)
    • Electroweak physics: Diboson/multiboson
      Conveners: Davide Pagani (Deutsches Elektronen-Synchrotron (DE)), Hang Yin (Central China Normal University CCNU (CN)), Joany Manjarres (Technische Universitaet Dresden (DE)), Pietro Vischia (Universite Catholique de Louvain (UCL) (BE))
    • Flavour physics: Session 1
      Conveners: Diego Guadagnoli (LAPTh Annecy), Dmytro Kovalskyi (Massachusetts Inst. of Technology (US)), Michel De Cian (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Sarah Porteboeuf (Université Clermont Auvergne (FR)), Semen Turchikhin (Joint Institute for Nuclear Research (RU))
    • Higgs physics: Session 2
      Conveners: Giuliano Panico (University of Florence and INFN Florence), Kerstin Tackmann (Deutsches Elektronen-Synchrotron (DE)), Meng Xiao (ZJU - Zhejiang University (CN))
      • 97
        Higgs combination at ATLAS+CMS
        Speaker: Haider Abidi (Brookhaven National Laboratory (US))
        HiggsCombination.pdf
        Recording
      • 98
        Higgs EFT benchmarks -- CANCELLED
      • 99
        HH nonresonant and self-coupling at ATLAS+CMS
        Speaker: Laura Pereira Sanchez (Stockholm University (SE))
        LauraPereira_HH_LHCP.pdf
        Recording
      • 100
        HH production in a global EFT Higgs fit
        Speaker: Ramona Groeber (Università di Padova and INFN, Sezione di Padova)
        LHCP21_ramona.pdf
        Recording
    • Joint sessions: Heavy ions and QCD
      LHC_JointHiggsTop.pdf
    • Joint sessions: Upgrades and performance
      Conveners: Christian Ohm (KTH Royal Institute of Technology (SE)), Nicole Skidmore (University of Bonn (DE)), Nora Emilia Pettersson (CERN), Saptaparna Bhattacharya (Northwestern University (US))
      LHC_JointHiggsTop.pdf
      • 106
        Improvements for reconstruction of physics objects with HL-LHC detector upgrades for ATLAS and CMS
        Speaker: Adriano Di Florio (Universita e INFN, Bari (IT))
        LHCP_Reco_Adriano.pdf
        Recording
      • 107
        Use of hardware acceleration for online event reconstruction for Run 3 and later
        Speaker: Marten Ole Schmidt (Ruprecht Karls Universitaet Heidelberg (DE))
        HardwareAccelerationOnlineReco_final.pdf
        Recording
      • 108
        Status and prospects for technical solutions for real-time analysis for Run-3 and later
        Speaker: Miguel Ramos Pernas (University of Warwick (GB))
        Miguel_Ramos_Pernas_LHCP2021.pdf
        Recording
      • 109
        Particle identification and tracking with timing detectors in ALICE and LHCb in Run 5
        Speaker: Stefania Bufalino (Politecnico di Torino (IT))
        LHCP2021_Bufalino.pdf
        Recording
      • 110
        HL-LHC Computing Challenges - how can the physics performance be maintained?
        Speaker: Vincent Pascuzzi (Lawrence Berkeley National Lab. (US))
        Google Slides
        Recording
    • 3:45 PM
      Coffee break
    • Plenary II: Beyond the Standard Model - TeV scale
      Conveners: Andrea Wulzer (CERN and EPFL), Marc Besancon (cea-saclay/dapnia/spp)
  • Wed, June 9
    • Plenary III: Electroweak Physics
      Conveners: Andrew Pilkington (University Of Manchester), Radja Boughezal (Argonne National Laboratory)
    • 1:30 PM
      Coffee break
    • Joint sessions: Flavour physics and QCD
      LHC_JointHiggsTop.pdf
    • Joint sessions: Higgs and top physics
      Conveners: Maria Moreno Llacer (Univ. of Valencia and CSIC (ES)), Meng Xiao (ZJU - Zhejiang University (CN))
      LHC_JointHiggsTop.pdf
    • Joint sessions: Joint BSM session
      Conveners: Niki Saoulidou (National and Kapodistrian University of Athens (GR)), Seema Sharma (Indian Institute of Science Education and Research (IN))
      LHC_JointHiggsTop.pdf
    • Outreach and diversity: Session 1
      Conveners: Benoit Blossier (CNRS/Laboratoire de Physique Théorique d'Orsay), Federica Baldassari (CERN), Federico Leo Redi (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Federico Ronchetti (INFN e Laboratori Nazionali di Frascati (IT)), Dr Kate Shaw (University of Sussex (GB))
    • Tools: Experimental tools
      Conveners: Andy Buckley (University of Glasgow (GB)), Loukas Gouskos (CERN), Philip Ilten (University of Cincinnati (US)), Sandro Christian Wenzel (CERN), Stefano Carrazza (CERN)
    • Upgrades: Detectors at HL-LHC
      Conveners: Christian Ohm (KTH Royal Institute of Technology (SE)), LianTao Wang (University of Chicago), Magnus Mager (CERN), Saptaparna Bhattacharya (Northwestern University (US)), Silvia Borghi (University of Manchester (GB))
      LHCPInstructions.pdf
    • 3:15 PM
      Coffee break
    • BSM - Feebly Interacting Particles: Unconventional signatures
      Conveners: Emma Torro Pastor (Univ. of Valencia and CSIC (ES)), José Francisco Zurita, Niki Saoulidou (National and Kapodistrian University of Athens (GR)), Vasiliki Mitsou (Univ. of Valencia and CSIC (ES)), Xabier Cid Vidal (Instituto Galego de Física de Altas Enerxías)
    • Flavour physics: Session 2
      Conveners: Diego Guadagnoli (LAPTh Annecy), Dmytro Kovalskyi (Massachusetts Inst. of Technology (US)), Michel De Cian (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Sarah Porteboeuf (Université Clermont Auvergne (FR)), Semen Turchikhin (Joint Institute for Nuclear Research (RU))
    • Heavy ions: Collectivity of soft and heavy flavour
      Conveners: Alexander Rothkopf (University of Stavanger), Hengne Li (South China Normal University (CN)), Maximiliano Puccio (CERN), Qipeng Hu (Lawrence Livermore Nat. Laboratory (US)), Wei Li (Rice University (US))
    • Joint sessions: EFT interpretations
      LHC_JointHiggsTop.pdf
    • Outreach and diversity: Session 2
      Conveners: Benoit Blossier (CNRS/Laboratoire de Physique Théorique d'Orsay), Federica Baldassari (CERN), Federico Leo Redi (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Federico Ronchetti (INFN e Laboratori Nazionali di Frascati (IT)), Kate Shaw (University of Sussex (GB))
    • Tools: Other tools
      Conveners: Andy Buckley (University of Glasgow (GB)), Loukas Gouskos (CERN), Philip Ilten (University of Cincinnati (US)), Sandro Christian Wenzel (CERN), Stefano Carrazza (CERN)
    • Upgrades: Future colliders
      Conveners: Christian Ohm (KTH Royal Institute of Technology (SE)), LianTao Wang (University of Chicago), Magnus Mager (CERN), Saptaparna Bhattacharya (Northwestern University (US)), Silvia Borghi (University of Manchester (GB))
      LHCPInstructions.pdf
    • 5:00 PM
      Coffee break
    • Plenary IV: Beyond the Standard Model - feebly interacting particles
      Conveners: Laura Patrizii (Universita e INFN, Bologna (IT)), Wolfgang Adam (HEPHY-Vienna)
  • Thu, June 10
    • Plenary V: Flavour Physics
      Conveners: Marie-Helene Schune (Université Paris-Saclay (FR)), Sebastien Descotes-Genon (Laboratoire de Physique Théorique d'Orsay)
    • 2:00 PM
      Coffee break
    • TeV-scale BSM: Third generation and flavour
      Conveners: Carl Gwilliam (University of Liverpool (GB)), Seema Sharma (Indian Institute of Science Education and Research (IN)), Yael Shadmi (Technion)
      • 194
        ATLAS + CMS searches for third generation SUSY particles
        Speaker: Daniel Spitzbart (Boston University (US))
        LHCP_2021_3rd_gen.pdf
        Recording
      • 195
        ATLAS + CMS searches for leptoquarks
        Speaker: Edson Carquin Lopez (Federico Santa Maria Technical University (CL))
        ECarquinTalkFinal.pdf
        Recording
      • 196
        ATLAS + CMS searches for vector-like quarks
        Speaker: Timothy Robert Andeen (University of Texas at Austin (US))
        AndeenLHCP_vFinal.pdf
        Recording
      • 197
        Flavour tagging for enhancing sensitivity to new physics
        Speaker: Yotam Soreq (Technion- Israel Institute of Technology (IL))
        2021_06_LHCP_2021.pdf
        Recording
      • 198
        Discussion
    • Electroweak physics: Precision
      Conveners: Davide Pagani (Deutsches Elektronen-Synchrotron (DE)), Hang Yin (Central China Normal University CCNU (CN)), Joany Manjarres (Technische Universitaet Dresden (DE)), Pietro Vischia (Universite Catholique de Louvain (UCL) (BE))
    • Flavour physics: Session 3
      Conveners: Diego Guadagnoli (LAPTh Annecy), Dmytro Kovalskyi (Massachusetts Inst. of Technology (US)), Michel De Cian (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Sarah Porteboeuf (Université Clermont Auvergne (FR)), Semen Turchikhin (Joint Institute for Nuclear Research (RU))
      • 203
        Classical spectroscopy
        Speaker: Valentina Mariani (Universita e INFN, Perugia (IT))
        Flavours_LHCP .pdf
        Recording
      • 204
        Tetra- and pentaquark "spectroscopy"
        Speaker: Elisabetta Spadaro Norella (Università degli Studi e INFN Milano (IT))
        LHCP21_Spadaro.pdf
        Recording
      • 205
        Recent Belle2 results and projections
        Speaker: Frank Meier (Duke University)
        LHCP_FlavorPhysicsAtBelle2.pdf
        Recording
      • 206
        [CANCELLED] LQCD calculations for flavour phenomenology: highlights and prospects
        Speaker: Antoine Gérardin (U. Aix-Marseille)
      • 207
        Round Table
        Recording
    • Higgs physics: Session 3
      Conveners: Giuliano Panico (University of Florence and INFN Florence), Kerstin Tackmann (Deutsches Elektronen-Synchrotron (DE)), Meng Xiao (ZJU - Zhejiang University (CN))
    • Detector performance: Session 2
      Conveners: Francesco Prino (Universita e INFN Torino (IT)), Nicole Skidmore (University of Bonn (DE)), Nora Emilia Pettersson (CERN), Phat Srimanobhas (Chulalongkorn University (TH))
    • QCD: Precision Measurements
      Conveners: Ben Nachman (Lawrence Berkeley National Lab. (US)), Frank Petriello (Northwestern University and Argonne National Lab), Gabor Veres (Eotvos Lorand University (HU)), Joe Osborn (Oak Ridge National Laboratory), Laura Brittany Havener (Yale University (US))
    • Top physics: Top mass and properties
      Conveners: Gauthier Durieux (CERN), Jose Enrique Palencia Cortezon (Universidad de Oviedo (ES)), Maria Moreno Llacer (Univ. of Valencia and CSIC (ES)), Stephen Farry (University of Liverpool (GB))
      Top@LHCP2021.pdf
    • 3:45 PM
      Coffee break
    • Plenary VI: Higgs Physics
      Conveners: Jeonghyeon Song (Konkuk University), Rosy Nikolaidou (Université Paris-Saclay (FR))
    • Poster Session
      • 232
        $\rm \Omega_{c}^{0}$ production cross section in pp collisions at $\sqrt{s}=$ 13 TeV with ALICE

        Recent measurements of charm-baryon production at midrapidity by the ALICE collaboration in pp collisions show baryon-over-meson ratios significantly higher than those in $\rm e^+e^-$ collisions for different charm-hadron species. The charmed baryon-to-meson and charmed baryon-to-baryon ratios provide unique information on hadronisation mechanisms. In this poster, the first measurement of production cross section of $\rm \Omega_{c}^{0}$ via the hadronic decay channel $\rm \Omega_{c}^{0} \rightarrow \pi^{+} \Omega^{-}$ (and its charge conjugate) in $2

        Speaker: Jianhui Zhu (Central China Normal University CCNU (CN))
        20210610_LHCP_Jianhui_v6.pdf
        Zoom meeting room
      • 233
        $\rm{\Lambda^{+}_{c}}$ cross section in pp and p--Pb collisions down to $p_{\rm T}$ = 0 at $\sqrt{s_{\rm NN}}$ = 5.02 TeV measured with ALICE

        The production cross sections of open heavy-flavour hadrons are typically described within the factorisation approach as the convolution of the parton distribution functions of the incoming protons, the perturbative QCD partonic cross section, and the fragmentation functions. These last are typically parametrised from measurements in ${\rm e^+e^-}$ collisions. Measurements of charm-baryon production are crucial to study the charm quark hadronisation in pp and p--Pb collisions and its difference with respect to ${\rm e^+e^-}$ collisions. Furthermore, measurements of charm-baryon production in p--Pb collisions provide important information about Cold Nuclear Matter (CNM) effects quantified in the nuclear modification factor $R_{\rm pPb}$. Measurements in p--Pb collisions also help us to understand how the possible presence of collective effects could modify the production of heavy-flavour hadrons and to find similarities among pp, p--Pb and Pb--Pb systems.
        In this poster, the latest measurements of $\Lambda^+_{\rm c}$ performed with the ALICE detector at midrapidity in pp, and the new measurement performed down to $p_{\rm T}=0$ in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV are presented. This allows us to show the first ALICE measurement of $\Lambda^+_{\rm c}/{\rm D^0}$ and $\Lambda^+_{\rm c}$ $R_{\rm pPb}$ down to $p_{\rm T}$ = 0 in p--Pb collisions. The $\Lambda^+_{\rm c}/{\rm D^0}$ ratio at midrapidity in small systems is significantly higher than the one in ${\rm e^+e^-}$ collisions, suggesting that the fragmentation of charm is not universal across different collision systems. Results are compared with theoretical calculations.

        Speaker: Annalena Sophie Kalteyer (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
        LcTopKs0_lowpT_Kalteyer_LHCP2021.pdf
        Zoom meeting room
      • 234
        A High-Granularity Timing Detector for the ATLAS Phase-II upgrade

        The increase of the particle flux (pile-up) at the HL-LHC with instantaneous luminosities up to
        L ~ 7.5 × 10$^{34}$ cm$^{-2}$s$^{-1}$ 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 momentum resolution will be particularly affected. A High Granularity Timing Detector (HGTD) will be installed in front of the LAr end-cap calorimeters for pile-up mitigation and luminosity measurement.
        The HGTD is a novel detector introduced to augment the new all-silicon Inner Tracker in the pseudo-rapidity range from 2.4 to 4.0, adding the capability to measure charged-particle trajectories in time as well as space. Two silicon-sensor double-sided layers will provide precision timing information for minimum-ionising particles with a resolution as good as 30 ps per track in order to assign each particle to the correct vertex. Readout cells have a size of 1.3 mm × 1.3 mm, leading to a highly granular detector with 3.7 million channels. Low Gain Avalanche Detectors (LGAD) technology has been chosen as it provides enough gain to reach the large signal over noise ratio needed.
        The requirements and overall specifications of the HGTD will be presented as well as the technical design and the project status. The on-going R&D effort carried out to study the sensors, the readout ASIC, and the other components, supported by laboratory and test beam results, will also be presented.

        Speaker: Asmaa Aboulhorma (Universite Mohammed V (MA))
        LHCP-poster.pdf
        LHCP-Slides.pdf
        Zoom meeting room
      • 235
        A Search for Lepton-Flavour-Violating Z->etau and Z->mutau Decays with the ATLAS Experiment

        In the Standard Model (SM), lepton flavour is conserved in all interactions.
        Hence, any observation of lepton flavour violation (LFV) would be an
        unambiguous sign of physics beyond the SM (BSM), and LFV processes are
        predicted by numerous BSM models.
        One way to search for LFV is in the decay of gauge bosons.
        In the search presented here, the decay of the Z boson to an electron-tau or
        muon-tau pair is investigated using the full Run 2 pp collision data set at
        sqrt(s) of 13TeV recorded by the ATLAS experiment at the LHC.
        The analysis exploits tau decays into hadrons and - for the first time in this
        channel in ATLAS - into leptons.
        A key ingredient of the search is the usage of a neural net to differentiate
        between signal and background events in order to make optimum use of the data.
        Combined with about 8 billion Z decays recorded by ATLAS in Run 2 of the LHC,
        the strongest constraints to date are set with Br(Z->etau)<5.0e-6 and
        Br(Z->mutau)<6.5e-6 at 95% confidence level
        - finally superseding the limits set by the LEP experiments more than two
        decades ago.

        Speaker: Ann-Kathrin Perrevoort (Nikhef National institute for subatomic physics (NL))
        LHCP_Perrevoort_2021.pdf
        Poster video explanation
        Zoom meeting room
      • 236
        AFP Performance in the Low Pile-up Runs

        Since 2016 ATLAS detector is equipped with new devices - ATLAS Forward Proton (AFP) detectors. AFP aims to measure protons scattered at very small angles, which are a natural signature of so-called diffractive events. Measurement of properties of diffractive events usually require low pile-up data-taking conditions. AFP performance in such special, low pile-up runs, including evaluation of detector efficiency, will be presented.

        Speaker: Maciej Piotr Lewicki (Polish Academy of Sciences (PL))
        LHCP2021.pdf
        Zoom meeting room
      • 237
        Analysis of b-jets production in p–Pb and pp collisions at √sNN = 5.02 TeV with ALICE

        Production of beauty quarks takes place mostly in initial hard scattering processes and can be calculated using perturbative quantum chromodynamics (pQCD). Thanks to excellent particle tracking capabilities, the ALICE experiment at the LHC is able to reconstruct beauty-hadron decay vertices, displaced hundreds of micrometers from the primary interaction vertex. The poster will present inclusive pT spectra of b jets measured in p–Pb and pp collisions at √sNN = 5.02 TeV, the corresponding nuclear modification factor, and the fraction of b jets among inclusive jets. The production cross-section of b jets was measured down to 10 GeV/c which is lower than in previous measurements of b jets done at the LHC. Low pT b-jets are expected to be more sensitive to cold nuclear matter effects in p–Pb collisions. They are an important reference for future Pb–Pb measurements, where their production provides information on color and parton mass dependence of parton energy loss.

        Speaker: Artem Isakov (Czech Academy of Sciences (CZ))
        aisakov_alice_bjets.pdf
        Video
        Zoom meeting room
      • 238
        Angular correlations of heavy-flavour decay electrons and charged particles in pp and p-Pb collisions $\sqrt{s_{\rm NN}}=$ 5.02 TeV with ALICE at LHC.

        Heavy quarks (charm, beauty), due to the large masses, mainly originate via hard partonic scattering processes in high-energy hadronic collisions. They evolve as parton showers and hadronize as back-to-back jet events.

        Two particles azimuthal angular correlations triggered by electrons from heavy-flavour hadron decays can be used for heavy-flavor jet studies. Such correlation distributions contains a near-side peak around $\Delta\varphi = 0$ formed by particles associated with a high-$p_{\rm T}$ trigger particle, and an away-side peak around $\Delta\varphi = \pi$. By changing the momentum scales of the trigger and associated particles one can study the heavy-flavour jet structure. In pp collisions, heavy-flavour correlations can be used to study the production and fragmentation of heavy-quarks. In p-Pb collisions, heavy-flavour correlations can be used to test cold nuclear matter and gluon saturation effects.

        In this poster, we present the current status and results of the ALICE measurement of azimuthal angular correlations of high-$p_{\rm T}$ heavy-flavour decay electrons with charged particles in pp and p-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV from the LHC Run 2 data. The results from pp and p-Pb collisions will be compared with each other to investigate any modification due to cold nuclear matter effect.

        Speaker: Ravindra Singh (Indian Institute of Technology Indore (IN))
        Angular correlations of heavy-flavour decay electrons and charged particles in pp collision at √s = 5.02 TeV with ALICE at LHC(1).pdf
        Zoom meeting room
      • 239
        Apparent modification of the jet-like yield in high multiplicity proton-proton collisions

        In this work we present the production of charged particles associated with high-$p_{\rm T}$ trigger particles ($8<\textit{p}_{\rm T}^{\rm trig.}<15$ GeV/$c$) at midrapidity in proton-proton collisions at $\sqrt{s}=5.02$,TeV simulated with the PYTHIA 8 Monte Carlo model [1]. The study is performed as a function of the relative transverse activity classifier, $R_{\rm T}$, which is the relative charged-particle multiplicity in the transverse region ($\pi/3< \phi^{\rm trig.}-\phi^{\rm assoc.}|<2\pi/3$) of the di-hadron correlations, and it is sensitive to the Multi-Parton Interactions. The evolution of the yield of associated particles on both the towards and the away regions ($3\leq p_{\rm T}^{\rm assoc.}< 8$ GeV/$c$) as a function of $R_{\rm T}$ is investigated. We propose a strategy which allows for the modelling and subtraction of the Underlying Event (UE) contribution from the towards and the away regions in challenging environments like those characterised by large $R_{\rm T}$. We found that the signal in the away region becomes broader with increasing $R_{\rm T}$. Contrarily, the yield increases with $R_{\rm T}$ in the towards region. This effect is reminiscent of that seen in heavy-ion collisions, where an enhancement of the yield in the towards region for 0-5% central Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=2.76$,TeV was reported. To further understand the role of the UE and additional jet activity, the transverse region is divided into two one-sided sectors, "trans-max" and "trans-min" selected in each event according to which region has larger or smaller charged particle multiplicity. Based on this selection criterium, the observables are studied as a function of $R_{\rm T}^{\rm max}$ and $R_{\rm T}^{\rm min}$, respectively. Results for pp collisions simulated with PYTHIA 8.244 and Herwing 7.2 will be shown.

        [1] J.Phys.G 48 (2020) 1, 015007

        Speaker: Gyula Bencedi (Universidad Nacional Autonoma (MX))
        Bencedi_LHCP2021.pdf
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      • 240
        ATLAS LAr Calorimeter Commissioning for LHC Run-3

        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 started in 2015 and about 150 fb$^{-1}$ of data at a center-of-mass energy of 13 TeV was recorded. With the end of Run-2 in 2018 a multi-year shutdown for the Phase-I detector upgrades was begun.
        As part of the Phase-I upgrade, new trigger readout electronics of the ATLAS Liquid-Argon Calorimeter have been developed. Installation began at the start of the LHC shut down in 2019 and is expected to be completed in 2020. A commissioning campaign is underway in order to realize the capabilities of the new, higher granularity and higher precision level-1 trigger hardware in Run-3 data taking. This contribution will give an overview of the new trigger readout commissioning, as well as the preparations for Run-3 detector operation and changes in the monitoring and data quality procedures to cope with the increased pileup.

        Speaker: Marcos Vinicius Silva Oliveira (CERN)
        ATLAS LAr Calorimeter Commissioning for LHC Run-3 - LHCP2021 - Marcos Oliveira.pdf
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      • 241
        ATLAS searches extra dimensions for using the full Run 2 ee and mumu datasets

        This poster summarises the extra dimensional models being searched for using the ATLAS detector at the Large Hadron Collider, in the full Run 2 dielectron and dimuon datasets. This data was produced in proton-proton collisions at a centre-of-mass energy of 13 TeV. In particular, the limits on the ADD model are presented, from a reinterpretation of the ATLAS Run 2 dilepton non-resonant analysis. Also highlighted, is a novel search being performed for clockwork extra dimensions.

        Speaker: Tracey Berry (University of London (GB))
        LHCPPosterADDBerry.pdf
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      • 242
        Charm is better than beauty: searching for the Higgs coupling to charm quarks

        Eight years ago, the discovery of a new fundamental particle, the Higgs boson (H), was announced by the ATLAS and CMS collaborations at CERN. While elementary particles acquire their mass through their interaction with the Higgs field, the large differences in their masses as well as the origin of the three generations of fermions remain unexplained to this day and constitute the Standard Model flavour puzzle.
        Measuring the coupling of each fermion to the Higgs boson is one of the most important tasks in modern particle physics. The next most promising candidate in the quark sector is the decay to a pair of charm quark and antiquark (cc).
        This poster will focus on the analysis of the associated production of the Higgs boson with a W or Z boson performed by the ATLAS Collaboration using data collected between 2015 and 2018, and will describe the analysis strategy employed to search for the H→cc signal. More precisely, recent achievements in the charm tagging technology that enables the identification of jets containing charm hadrons will be presented. Our current understanding of the H→cc process will be outlined, and the various results of the ATLAS, CMS and LHCb collaborations will be compared. Finally, the interpretation of this new result as a probe to the Standard Model flavour puzzle and its large constraining power on new physics scenarios will be discussed.

        Speaker: Marko Stamenkovic (Nikhef National institute for subatomic physics (NL))
        LHCP_Poster_MarkoStamenkovic.pdf
        LHCP_slides_MarkoStamenkovic.pdf
        Video explanation
        Zoom meeting room
      • 243
        CMS RPC activities during LS2 and Commissioning

        The second LHC long shutdown period (LS2) was a crucial opportunity for the CMS Resistive Plate Chambers (RPC) to complete their consolidation and upgrade projects. The consolidation includes detector maintenance for gas tightness, HV (high voltage), LV (low voltage) and slow control operation. Dedicated studies were performed to understand the behaviour of RPC currents with comparison to RUN2. This paper summarises the activities performed and commissioning of CMS RPC on the surface (For RE4) and for full detector in CMS cavern in different operating conditions.

        Speaker: Mapse Barroso Ferreira Filho (Universidade do Estado do Rio de Janeiro (BR))
        Poster CMS RPC activities during LS2 and Commissioning - LHCP_2021.pdf
        Zoom room link
      • 244
        Colour and logarithmic accuracy in final-state parton showers

        Standard dipole parton showers are known to yield incorrect subleading-colour contributions to the leading (double) logarithmic terms for a variety of observables. In this work, concentrating on final-state showers, we present two simple, computationally efficient prescriptions to correct this problem, exploiting a Lund-diagram type classification of emission regions. We study the resulting effective multiple-emission matrix elements generated by the shower, and discuss their impact on subleading colour contributions to leading and next-to-leading logarithms (NLL) for a range of observables. In particular we show that the new schemes give the correct full colour NLL terms for global observables and multiplicities. Subleading colour issues remain at NLL (single logarithms) for non-global observables, though one of our two schemes reproduces the correct full-colour matrix-element for any number of energy-ordered commensurate-angle pairs of emissions. While we carry out our tests within the PanScales shower framework, the schemes are sufficiently simple that it should be straightforward to implement them also in other shower frameworks.

        Speaker: Rok Medves (University of Oxford)
        Colour Poster Medves LHCP2021
        Poster video explanation
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      • 245
        Combined Constraints on First Generation Leptoquarks

        We present a combined analysis of low energy precision constraints and LHC searches for leptoquarks which couple to first generation fermions. Considering all ten leptoquark representations, five scalar and five vector ones, we study at the precision frontier the constraints from $K\to\pi\nu\nu$, $K\to\pi e^+e^-$, $K^0-\bar K^0$ and $D^0-\bar D^0$ mixing, as well as from experiments searching for parity violation (APV and QWEAK). We include LHC searches for $s$-channel single resonant production, pair production and Drell-Yan-like signatures of leptoquarks. Particular emphasis is placed on the recent CMS analysis of lepton flavour universality violation in non-resonant di-lepton pairs. The excess in electron events could be explained by $t$-channel contributions of the leptoquark representations $\tilde{S}_1, S_2, S_3, \tilde{V}_1, V_2 (\kappa_2^{RL} \neq 0)$ and $V_3$ without violating other bounds. Regarding the so-called ``Cabibbo angle anomaly'', we observe that the present constraints are too restrictive to allow for a resolution via direct leptoquark contributions to super-allowed beta decays.

        Speaker: Luc Schnell
        Link to Zoom room
        Poster (Landscape).pdf
        Slides.pdf
        Video Explanation.mp4
      • 246
        Constraining the Dark Sector with the Mono-jet signature with the ATLAS detector at the LHC

        Several Dark Sector models predict the existence of particles with macroscopic life-times and semi-visible jets (QCD-like jets which include stable Dark Sector particles). These can lead to final states with large missing transverse momentum recoiling against at least one highly energetic jet, a signature that is often referred to as a mono-jet.
        The RECAST framework is used to re-interpret the recent ATLAS mono-jet search, based on 139 $\mathrm{fb^{-1}}$ of pp collisions collision data at $\sqrt{s} = 13$ TeV, in terms of Dark Sector models not studied in the original work. Complementary results for models involving long-lived particles are found with respect to dedicated searches. Results are also interpreted for the first time at ATLAS in terms of searches for semi-visible jets produced from a QCD-like parton shower.

        Speaker: Elena Pompa Pacchi (Sapienza Universita e INFN, Roma I (IT))
        ConstrainingTheDarkSector_LHCP2021.pdf
        Video Explanation
        Zoom room link
      • 247
        Convolutional Neural Networks for event classification

        In this study, a new technique for event classification using Convolutional Neural Networks (CNN) is presented. Results obtained using this technique are shown and compared to more traditional Machine Learning approaches for two different physics cases.
        The new technique explores the power of visual recognition, which is one of the fastest-growing areas in Artificial Intelligence, as a consequence of the “deep learning” evolution of CNNs. Since CNNs are fed with images, an original and intuitive way for encoding the event information in images has been developed, building a one-to-one correspondence that allows us to face the event classification as an image classification.
        In order to take advantage of the good performance of existing CNN architectures, transfer learning has been tested, showing to be a suitable option. VGG16 has been chosen as the benchmark, which is based on the well-known architecture named AlexNet. Additionally, an alternative approach with a simpler CNN architecture has shown to give also good results when trained from scratch. Nevertheless, a comparison with a more standard technique such as a BDT (using the XGBoost library) is provided in order to confirm that the results obtained with this unexplored technique are satisfactory.
        The two classifications studied correspond to current challenges in Particle Physics. First, a New Physics example corresponding to a Dark Matter search has been performed, considering a mono-top signal and several of its main background processes. The selected events were required to have exactly one lepton and at least one b-tagged jet, together with large missing transverse momentum. Second, with the same selection criteria, a tt+X classification is also carried out, in which exotic processes with four top quarks as final state are tried to be identified among other processes such as ttH or ttW.

        Speaker: Adrian Rubio Jimenez (Univ. of Valencia and CSIC (ES))
        Adrian_LHCP_poster_2021.pdf
        ADRIAN_LHCP_poster_video.mp4
        Adrian_LHCP_slides_format_poster.pdf
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      • 248
        Correlation between initial spatial anisotropy and final momentum anisotropies in relativistic heavy ion collisions

        The momentum anisotropy ($v_{n}$) of the produced particles in relativistic nuclear collisions is considered to be a response of the initial geometry or the spatial anisotropy ($\varepsilon_{n}$) of the system formed in these collisions. The linear correlation between $\varepsilon_{n}$ and $v_{n}$ measures the efficiency at which the initial spatial eccentricity is converted to final momentum anisotropy in heavy ion collisions. We have studied the transverse momentum, collision centrality, and beam energy dependence of this correlation for different charged particles using a hydrodynamical model framework MUSIC. The ($\varepsilon_{n}$ − $v_{n}$) correlation is found to be stronger for central collisions and also for n=2 compared to that for n=3 as expected. However, the transverse momentum ($p_{T}$) dependent correlation coefficient shows interesting behaviour which strongly depends on the mass as well as $p_{T}$ of the produced particles. The correlation strength is found to be larger for lighter particles in the lower $p_{T}$ region. We have seen that the relative fluctuation in anisotropic flow depends strongly in the value of $\eta/s$ specially in the region $p_{T}<$ 1 GeV unlike the correlation coefficient which does not show significant dependence on $\eta/s$

        Speaker: Sanchari Thakur (Department of Atomic Energy (IN))
        LHCP2021_sanchari_poster.pdf
        sanchari_poster_LHCP.mp4
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      • 249
        Cosmics muon validation and electronics performance of the New Small Wheel MicroMegas sectors for ATLAS Muon Upgrade

        The ATLAS Muon Upgrade project is a part of the Large Hadron Collider (LHC) - High Luminosity (HL) upgrade project which aims to increase its instantaneous luminosity up to 7.5X10$^{34}$ cm$^{−2}$s$^{−1}$. The present first muon station in the forward regions of ATLAS is being replace by the so-called New Small Wheels (NSWs). The NSWs consist of resistive-strip MicroMegas (MM) detectors and small-strip Thin Gap chambers (sTGC), both providing trigger and tracking capabilities, for a total active surface of more than 2500 m$^2$. After the R&D, design and prototyping phase, series production of MM and sTGC chambers are being constructed. The NSW Upgrade project, the most challenging and complex one of the ATLAS phase-I upgrade projects, is expected to be completed with the installation of NSW in the ATLAS Underground cavern during the summer of 2021. The whole NSW structure includes 128 detectors, in total to ∼2.4 million readout channels. This new generation of readout electronics are built to stand the harsh radiation hostile conditions, where the expected background rate will reach 20 kHz/cm$^2$. Eight micromegas detectors layers are integrated into a double wedge. The mechanical integration is followed by the electronic integration and its initial validation into the data acquisition system. Each fully equipped MicroMegas doublewedge is tested at a dedicated cosmic ray facility and the high voltage settings are defined. Then, a sequence of tests follows, related to efficiency maesurement , cluster size, resolution for all the individual layers of the double wedge are performed. These steps consist the qualification of the MicroMegas sector for the final integration with the sTGC wedges before mounting them on the NSW structure. The electronics performance and cosmic rays validation results of the final validation
        of Micromegas double wedges will be presented.

        Speaker: Maria Perganti (National Technical Univ. of Athens (GR))
        Perganti_LHCP_2021_poster.pdf
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      • 250
        CP-violating observables and top-pair production at LHC.

        We study new physics contributions to CP-violating anomalous couplings of top-quark in the context of top-pair production and their consequent decays into a pair of dilepton and b-jets at the Large Hadron Collider. An estimate of sensitivities to such CP-violating interactions would also be discussed for the pre-existing 13 TeV LHC data and its projections for the proposed LHC run at 14 TeV.

        Speaker: Ms Apurba Tiwari (Aligarh Muslim University)
        LHCP2021_poster.pdf
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      • 251
        Deep Neural Network resizing for real-time applications in High Energy Physics

        Next-generation collider experiments will have to cope with extremely high collision rates, making it necessary to implement real-time event processing capabilities. Among the standard pattern recognition algorithms thought to be run on Look-Up Tables, Machine Learning methods, and in particular Deep Neural Networks, are spreading very fast and there is growing interest in executing such algorithms at trigger level to improve on-line selection performance. The main issue in running these algorithms in real-time is the amount of operation that needs to be computed. Low-latency hardware solutions exist, e.g. FPGAs, but the main constraint to the implementation is often related to the size of the model, that has to be finely tuned not to exceed the available memory. We present an approach to reduce in an optimized way the size of models based on Fully Connected Neural Networks, having under control the model performances. The number of features in input to the Deep Neural Network is reduced using a CancelOut layer, optimized through an original loss function. We compare the performances of this approach with other techniques. We use as baseline study the selection of proton-proton collision events in which the boosted Higgs boson decays to two $b$-quarks and both the decay products are contained in a large and massive jet. These events have to be selected against an overwhelming QCD background. Promising results are shown and the way for future developments is outlined.

        Speaker: Mr Andrea Di Luca (Universita degli Studi di Trento and INFN (IT))
        Deep Neural Network resizing for real-time applications in High Energy Physics-lhcp2021_poster.pdf
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      • 252
        Development of a L1 tau trigger algorithm using the CMS high-granularity calorimeter information

        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 (SM) as well as searches for new physics beyond the SM. The CMS Collaboration is planning to replace entirely its trigger and data acquisition systems to match this ambitious physics program. Efficiently collecting datasets in Phase 2 will be a challenging task, given the harsh environment of 200 proton-proton interactions per LHC bunch crossing. The already challenging implementation of an efficient tau lepton trigger will become, in this conditions, an even crucial and harder task; especially interesting will be the case of hadronically decaying taus. To this end, the foreseen high-granularity endcap calorimeter (HGCAL), and the astonishing amount of information it will provide, play a key role in the design of the new online level-1 (L1) triggering system. In this talk I will present the development of a L1 trigger for hadronically decaying taus based on the sole information from the HGCAL detector. I will present some novel ideas for a L1 trigger based on machine learning that can be implemented in FPGA firmware. The expected performance of the new trigger algorithm will be presented, based on simulated collision data of the HL-LHC.

        Speaker: Mr Jona Motta (Centre National de la Recherche Scientifique (FR))
        L1TauTrg_poster.pdf
        L1TauTrg_slides.pdf
        video.mov
        video.mp4
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      • 253
        Development of DAQ to DCS communication in the ATLAS Inner Tracker

        The increase of luminosity foreseen for the High-Luminosity LHC phase requires the substitution of the ATLAS Inner Detector with a new tracking detector, called Inner Tracker. It will be an all-silicon system consisting of a pixel and a strip subdetector. The ATLAS wide FELIX system will be the off-detector interface to the Inner Tracker.
        In order to efficiently bring the Inner Tracker into operation, the intercommunication between the DAQ and the DCS is foreseen. Such communication is mediated by OPC servers that interface to the different hardware and software resources and to the Finite State Machine, which supervises all subdetectors. This framework is designed to be flexible, so that it can easily incorporate heterogeneous resources coming from different subsystems, including the FELIX setups.
        This poster describes the current status of the implementation of OPC servers for the intercommunication between the DAQ and the DCS and their integration in the FELIX setups.

        Speaker: Alessandra Palazzo (INFN Lecce e Universita del Salento (IT))
        DAQtoDCSCommunicationITk.pdf
        Poster video explanation
        Zoom room
      • 254
        Development of the ATLAS Liquid Argon Calorimeter Readout Electronics for the HL-LHC

        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 shapers to meet these requirements are ongoing in 130nm CMOS technology. In order to digitize the analogue signals on two gains after shaping, a radiation-hard, low-power 40 MHz 14-bit ADCs is developed using a pipeline+SAR architecture in 65 nm CMOS. Characterization of the prototypes of the frontend components show good promise to fulfill all the requirements. The signals will be sent at 40 MHz to the off-detector electronics, where FPGAs connected through high-speed links will perform energy and time reconstruction through the application of corrections and digital filtering. Reduced data are sent with low latency to the first level trigger, while the full data are buffered until the reception of trigger accept signals. The data-processing, control and timing functions will be realized by dedicated boards connected through ATCA crates. Results of tests of prototypes of front-end components will be presented, along with design studies on the performance of the off-detector readout system.

        Speaker: Mesut Unal (University of Texas at Austin (US))
        Unal-ATL-COM-PHYS-2021-309.2.pdf
        Video_Explanation
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      • 255
        Development of the Configuration, Calibration and Monitoring System of the New Small Wheel Electronics for the ATLAS experiment

        A series of upgrades are planned for the LHC accelerator to increase it's instantaneous luminosity to 7.5×10$^{34}$ cm$^{-2}$s$^{-1}$. The luminosity increase drastically impacts the ATLAS trigger and readout data rates. The present ATLAS Small Wheel Muon detector will be replaced with a New Small Wheel (NSW) detector which is expected to be installed in the ATLAS underground cavern by the end of the Long Shutdown 2 of the LHC. One crucial part of the integration procedure concerns the installation, testing and validation of the on-detector electronics and readout chain for a very large system with a more than 2.1 M electronic channels in total. These include 7K Front-End Boards (MMFE8, SFEB, PFEB), custom printed circuit boards each one housing eight 64-channel VMM Application Specific Integrated Circuits (ASICs) that interface with the ATLAS Trigger and Data Acquisition (TDAQ) system through 1K data-driver cards. The readout chain is based on optical link technology (GigaBit Transceiver links) connecting the backend to the front-end electronics via the Front-End LInk eXchange (FELIX), is a newly developed system that will serve as the next generation readout driver for ATLAS. For the configuration, calibration and monitoring path, the various electronics boards are supplied with the GBT-SCA ASIC (Giga-Bit Transceiver-Slow Control Adapter) which is part of the Gigabit Transceiver Link(GBT) chipset and it's purpose is to distribute control and monitoring signals to the electronics embedded in the detectors and in the ATLAS service areas. Experience and performance results from the first large-scale electronics integration tests performed at CERN on final NSW sectors will be presented.

        Speaker: Polyneikis Tzanis (National Technical Univ. of Athens (GR))
        tzanis_poster_lhcp_2021.pdf
        Zoom Room
      • 256
        Differential cross section measurements of the tW process at CMS

        Single top quark production is the subleading production process of top quarks at the LHC after the top quark pair production. The latest differential measurements of single top quark production (tW) cross sections are presented using data collected by the CMS detector at a center-of-mass energy of 13 TeV. The cross sections are measured as a function of various kinematic observables of the top quarks and the jets and leptons of the events in the final state. The results are confronted with precise theory calculations.

        Speaker: Mr Victor Rodriguez Bouza (Universidad de Oviedo - ICTEA (ES))
        2021-06_lhcp_tWdiffposter.pdf
        Zoom meeting room
      • 257
        Event-Level Anomaly Detection for Multijet BSM Searches with Probabilistic Autoencoders

        Although most of Beyond Standard Model (BSM) searches are targeting specific theory models, there has always been a keen interest in the development of model-independent methods amongst the High Energy Physics(HEP) community. Machine Learning (ML) based anomaly detection stands among the latest up-and-coming avenues for creating model-agnostic BSM searches. The focus of this research is the design of anomalous event taggers based on autoencoder models. Alongside the signal discrimination power, a high priority is placed on both signal-model and background-model independence. To this end, the autoencoder is used in conjunction with a Normalizing Flow model tasked with latent space density estimation. Both event reconstruction error and latent representation likelihood are combined in order to mitigate the bias of the resulting event anomaly score. Overall this method is showing promising anomaly detection performance without loosing much in terms of generalization power. On the multijet LHC Olympics data, it is consistently able to identify BSM signals, even in the challenging scenarios posed by the Black Box datasets, where the signal content is unknown.

        Speaker: Ioan-Mihail Dinu (Horia Hulubei National Institute of Physics and Nuclear Enginee)
        DINU_LHCP2021_landscape.pdf
        DINU_LHCP2021.pdf
        Zoom Meeting Room
      • 258
        Evidence for four-top-quark production in the multilepton final state in proton-proton collisions at sqrt(s)=13 TeV with the ATLAS detector

        A search is presented for four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider with an integrated luminosity of 139/fb. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24 +7 -6 fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.

        Speaker: Albert Kong (University of Adelaide (AU))
        lhcp2021-poster.pdf
        Zoom meeting room
      • 259
        Extension of Glauber-like model for Proton-Proton collisions using anisotropic and inhomogeneous density profile

        The formation of partonic medium in the relativistics heavy-ion collisions is always marked by the values of the ratio of certain observables assuming $p+p$ collisions as a reference. But recent studies of small systems formed in $p+p$ collisions at the LHC energies hint towards the possibility of production of medium with collective behaviour. Results from $p+p$ collisions have routinely been used as baseline to analyse and understand the production of QCD matter expected to be produced in nuclear collisions. Therefore, results from $p+p$ collisions required more careful investigation to understand whether QCD matter is produced in high multiplicity $p+p$ collisions. With this motivation, the Glauber model traditionally used to study the heavy-ion collision dynamics at high-energies is applied to understand the dynamics of $p+p$ collisions. We have used anisotropic and inhomogeneous quark/gluon based proton density profile, a realistic picture obtained from the results of deep inelastic scattering, and found that this model explains the charged-particle multiplicity distribution of $p+p$ collisions at LHC energies very well. Collision geometric properties like impact parameter and mean number of binary collisions ($\langle N_{coll} \rangle$), mean number of participants ($\langle N_{part} \rangle$) at different multiplicities are determined for $p+p$ collisions. We further used these collision geometric properties to estimate average charged-particle pseudorapidity density ($\langle dN_{ch}/d\eta \rangle$) and found it to be comparable with the experimental results. Knowing $\langle N_{coll} \rangle$, we have for the first time obtained nuclear modification-like factor ($R_{HL}$) in $p+p$ collisions. We also estimated eccentricity and elliptic flow as a function of charged-particle multiplicity using the linear response to initial geometry and found a good agreement with experimental results.

        Speaker: Suman Deb (Indian Institute of Technology Indore (IN))
        LHCP_Suman_Glauber.pdf
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      • 260
        Extraction of the multiplicity dependence of Multiparton Interactions from LHC pp data using Machine Learning techniques

        Over the last years, Machine Learning (ML) tools have been successfully applied to a wealth of problems in high-energy physics. In this talk, we will discuss the extraction of the average number of Multiparton Interactions ($〈N_{mpi}〉$) from minimum-bias pp data at LHC energies using ML methods. Using the available ALICE data on transverse momentum spectra as a function of multiplicity we report the $〈N_{mpi}〉$ for pp collisions at √s = 7 TeV, which complements our previous results for pp collisions at √s = 5.02 and 13 TeV. The comparisons indicated a modest energy dependence of $〈N_{mpi}〉$. We also report the multiplicity dependence of $N_{mpi}$ for the three center-of-mass energies. These results are fully consistent with the existing ALICE measurements sensitives to MPI, therefore they provide experimental evidence of the presence of MPI in pp collisions.

        Speaker: Erik Alfredo Zepeda Garcia (Universidad Nacional Autonoma (MX))
        LHCP2021erik.pdf
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      • 261
        Fast Beam Condition Monitor of the CMS experiment for precision luminosity measurement at HL-LHC

        To achieve the challenging target of 1% precision on luminosity determination at the high-luminosity LHC (HL-LHC) with instantaneous luminosity up to $7.5 × 10^{34} cm^{−2} s^{−1}$, the CMS experiment will employ multiple luminometers with orthogonal systematics. A key component of the proposed system is a stand-alone luminometer, the Fast Beam Condition Monitor (FBCM), which is fully independent from the central trigger and data acquisition services and able to operate during all times at 40 MHz providing bunch-by-bunch luminosity measurement with 1 s time granularity. FBCM is foreseen to be placed inside the cold volume of the Tracker as it utilizes silicon-pad sensors exploiting the zero-counting algorithm of hits for luminosity measurement. FBCM will also provide precise timing information with a few ns precision enabling the measurement of beam induced background. We report on the optimization of the design and the expected performance of FBCM.

        Speaker: Hamed Bakhshiansohi (DESY and IUT)
        FBCMPosterLHCP2021.pdf
        Zoom meeting room
      • 262
        Fast simulation of a Time-of-Flight detector for Forward Protons at the LHC

        The ATLAS Forward Proton physics program at CERN aims at studying soft and hard diffractive events from ATLAS proton collisions. Time-of-Flight (ToF) system is used to reduce the background from multiple proton-proton collisions. In this presentation, we describe technical details of the Fast Cherenkov model of photons generation and transportation through the optical part of the ToF detector. This Fast simulation uses Python programming language and Numba (high performance compiler). It is about 200 times faster than Geant4 simulation already implemented, and provides similar results concerning length and time distributions of photons. Moreover, this Fast simulation allows computing easily the time resolution of the different bars of ToF detector.

        Speaker: Olivier Rousselle (Laboratoire Kastler Brossel (FR))
        Fast simulation - Olivier Rousselle.pdf
        ZOOM poster room
      • 263
        FELIX-based Data Acquisition System Integration with the NSW Micromegas Electronics and Detector Performance Validation

        The New Small Wheel (NSW) upgrade is now in its commissioning phase. The future ATLAS detector sub-system will be one of the first to employ the Front-End Link eXchange (FELIX) as its Data Acquisition (DAQ) scheme. Currently, one of the main focus points of the community is to ensure proper acquiring of data from the detector media, besides validating the performance of the detectors themselves. This is being conducted at the BB5 area of CERN, where the Micromegas chambers are subjected to cosmic radiation. In this work, the software and FPGA-based tools that have been developed to aid in satisfying the stringent 2-week turnaround time per detector wedge will be described. These include applications that control the complex DAQ system and validate the data paths of thousands of readout channels and hundreds of high-speed optical links in an automated manner. Another aspect of the work is the description of methodologies that have been developed to validate the chamber’s performance under cosmic radiation. Finally, an FPGA system that performs scintillator coincidence trigger filtering will be described. The aforementioned part of the system is used to emulate the deterministic nature of the muons’ time-of-arrival during the actual run, in order to perform timing resolution performance profiling of the Micromegas detector.

        Speaker: Christos Bakalis (National Technical Univ. of Athens (GR))
        lhcp_poster_bakalis.pdf
        Zoom Meeting Room
      • 264
        Femtoscopic analysis of $\mathrm{K^0_S-p}$ pairs in proton–proton collisions at $\sqrt{s} = 13$ TeV with ALICE

        The precise knowledge of the strong interaction between kaons and nucleons
        is a key element to describe the interaction between hadrons in the non-perturbative regime of QCD.
        Moreover, the knowledge of this interaction plays an important role in the study of the equation
        of state of dense baryonic matter, and hence has important implications for the
        modeling of neutron stars.

        We present the first femtoscopy measurement of momentum correlations of $\mathrm{K^0_Sp}$ and $\mathrm{K^0_S\overline{p}}$ pairs in pp collisions at $\sqrt{s}=13 $ TeV measured by the ALICE experiment at the LHC.
        In this study, the strong scattering parameters of $\mathrm{K^0_Sp}$ and $\mathrm{K^0_S\overline{p}}$ pairs are extracted through the Lednicky-Lyuboshitz model. This model links the experimental momentum correlation to the strong final state interaction parameters.
        The extracted scattering parameters indicate that the strong interaction between $\mathrm{K^0_Sp}$($\mathrm{\overline{p}}$) is attractive, contrary to $\mathrm{K^+p}$ and $\mathrm{K^-p}$. This indicates that in the $\mathrm{K^0_Sp}$($\mathrm{\overline{p}}$)
        there are no resonances below threshold which are responsible of the repulsive strong interaction between $\mathrm{K^-p}$.

        Speaker: Marta Urioni (Universita di Brescia (IT))
        K0sp_femto_ALICE_LHCP2021.pdf
        Zoom Meeting Room
      • 265
        Firmware of the ATLAS Level-0 Endcap Muon Trigger for HL-LHC

        The design and the status of the development of the Level-0 endcap muon trigger firmware for the ATLAS experiment at the HL-LHC are presented. The firmware reconstructs muon candidates with an improved momentum resolution by exploiting all hit data from Thin Gap Chambers (TGCs) to be available at XCVU13P FPGA mounted on the trigger and readout boards. The track segment is reconstructed by a pattern matching algorithm, where the TGC hits are compared with predefined hit patterns. Each predefined hit pattern has associated position and angle of the track segment. The algorithm with minimal utilisation of the XCVU13P FPGA resource is a major challenge. We achieved 1 cm position and 4 mrad angular resolutions, which satisfy the requirements, with less than 40% of the UltraRAM resources for full coverage of TGCs. The performance was evaluated with the post-synthesis simulation with the hit inputs from GEANT4 full simulation. The implementation was succeeded with no timing violation by optimised latch circuit locations. The results constitute an important ingredients in the development of the Level-0 endcap muon trigger firmware for HL-LHC.

        Speaker: Yuki Mitsumori (Nagoya University (JP))
        Firmware_of_the_ATLAS_Level-0_Endcap_Muon_Trigger_for_HL-LHC.pdf
        ZOOM meeting room
      • 266
        First Commissioning Data from FASER

        FASER (ForwArd Search ExpeRiment) fills the axial blindspot of other, radially arranged LHC experiments. It is installed 480 meters from the ATLAS interaction point, along the collision axis. FASER will search for dark matter and other new, long-lived particles that may be hidden in the collimated reaction products exiting ATLAS. FASER comprises: a magnetic spectrometer built with ATLAS silicon tracker modules; four LHCb outer ECAL modules; an emulsion neutrino detector; and plastic scintillators for veto, trigger and timing. The experiment is currently in its final commissioning stages. I report on successful preliminary tests of hardware and software performance with cosmic rays on the surface, and after installation in situ. FASER will begin taking pp collision data from the start of LHC Run 3, in 2022.

        Speaker: Savannah Rose Shively (University of California Irvine (US))
        LHCP - Shively - FASER Commissioning.pdf
        Zoom meeting room
      • 267
        Hyperloop – The ALICE analysis train system for Run 3

        ALICE analysis mostly deals with large datasets using the distributed Grid infrastructure. In Run 1 and 2, ALICE developed a system of analysis trains (so-called “LEGO trains”) that allowed the user to configure analysis tasks (or wagons) that are expected to be run on the same data. The LEGO train system builds upon existing tools: the ALICE analysis framework as well as the Grid submission and monitoring infrastructure. This centralized system improved the resource utilization and provided a friendly user interface (UI), in addition to bookkeeping functionalities. Currently, 90$\%$ of ALICE analyses use the train system. The ongoing major upgrade for LHC Run 3 will enable the experiment to cope with an increase of lead-lead collision data of two orders of magnitude compared to the Run 1 and 2 data-taking periods. In order to process this unprecedented data sample, a new computing model has been implemented, the Online-Offline Computing System (O$^2$). Analysis trains will also be the main workhorse for analysis in Run 3: a new infrastructure, Hyperloop, is being developed based on the successful concept of the LEGO trains. The Hyperloop train system includes a different and improved UI using modern responsive web tools, bookkeeping, instantaneous automatic testing, and the production of derived skimmed data. So far, about 600 Hyperloop trains have been successfully submitted to the Grid and ALICE analysis facilities using converted Run 2 data. An overview of ALICE train system concept will be exposed in this poster, highlighting the improvements of the new Hyperloop framework for analysis in Run 3.

        Speaker: Raquel Quishpe Quishpe (University of Houston (US))
        Poster video explanation
        Quishpe-LHCP-Poster.pdf
        Zoom meeting room
      • 268
        Impact of Soft Photons on $B\to K\ell^+\ell^-$

        In this talk, we will be discussing $\mathcal{O}(\alpha)$ QED corrections to $B\to K\ell^+\ell^-$ modes. The structure of the contact term is fixed by requiring the gauge invariance of the real emission amplitude. The calculation is done by providing fictitious mass ($\lambda$) to the photon, which acts as IR regulator and results are shown to be independent of it. QED effects are found to be negative. Electron channels are shown to receive large correction $\mathcal{O}(20\%)$. We will also discuss its impact on lepton flavour universality (LFU) ratio ($R_{K}^{\mu e}$).

        Speaker: Dayanand Mishra
        LHCP2021 .pdf
        Poster introduction
        Zoom meeting room
      • 269
        Implementation of machine learning techniques to predict impact parameter and transverse spherocity in heavy-ion collisions at the LHC

        Machine learning techniques have been quite popular recently in the high-energy physics community and have led to numerous developments in this field. In heavy-ion collisions, one of the crucial observables, the impact parameter, plays an important role in the final-state particle production. This being extremely small (i.e. of the order of a few fermi), it is almost impossible to measure impact parameter in experiments. In this work, we implement the ML-based regression technique via Gradient Boosting Decision Trees (GBDT) to obtain a prediction of impact parameter in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV using A Multi-Phase Transport (AMPT) model. After its successful implementation in small collision systems, transverse spherocity, an event shape observable, holds an opportunity to reveal more about the particle production in heavy-ion collisions as well. In the absence of any experimental exploration in this direction at the LHC yet, we suggest an ML-based regression method to estimate centrality-wise transverse spherocity distributions in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV by training the model with minimum bias collision data. Throughout this work, we have used a few final state observables as the input to the ML-model, which could be easily made available from collision data. Our method seems to work quite well as we see a good agreement between the simulated true values and the predicted values from the ML-model.

        Speaker: Dr Aditya Nath Mishra (Wigner Research Centre for Physics Budapest, Hungary)
        Implementation of machine learning techniques to predict impact parameter and transverse spherocity in heavy-ion collisions at the LHC
        Poster-ML-Aditya.pdf
      • 270
        Inclusive top-antitop production cross section at sqrt(s) = 5.02 TeV in CMS

        The top quark pair production cross section is measured in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data collected in 2017 by the CMS experiment at the LHC corresponding to an integrated luminosity of 304 1/pb are analyzed. The measurement is performed using events with one electron and one muon of opposite sign, and at least two jets. The measured cross section is found to be 60.3 ± 5.0 (stat) ± 2.8 (syst) ± 0.9 (lumi) pb. To reduce the statistical uncertainty, a combination with the result in the l+jets channel, based on 27.4 1/pb of data collected in 2015 at the same center-of-mass energy, is then performed, obtaining a value of 62.6 ± 4.1 (stat) ± 3.0 ( syst+lumi ) pb, with a total uncertainty of 7.9%, in agreement with the standard model.

        Speaker: Alejandro Soto Rodriguez (Universidad de Oviedo (ES))
        LHCP-ttbar5TeV.pdf
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      • 271
        Insight into K∗ production in pp collisions as a function of collision energy, event-topology and multiplicity with ALICE at the LHC

        Hadronic resonances are short-lived particles whose lifetimes are comparable to the hadronic phase lifetime of the system produced in ultrarelativistic nucleon-nucleon or nuclear collisions. These resonances are sensitive to the hadronic phase effects such as rescattering and regeneration processes which might affect the resonance yields and shape of the transverse momentum spectra. In addition, event shape observables like transverse spherocity are sensitive to the hard and soft processes. They are useful tools to distinguish the isotropic and jetty-dominated events in pp collisions. Studying the dependence of the yield of resonance on transverse spherocity and multiplicity allows us to understand the resonance production mechanism with event topology and system size respectively. Furthermore, the measurements in small systems are used as a reference for heavy-ion collisions and are helpful for the tuning of Quantum chromodynamics inspired event generators. In this contribution, we present recent results on K∗(892)0 production obtained by the ALICE experiment in pp collisions at several collision energies, event multiplicities and as a function of transverse spherocity. The results include the transverse momentum spectra, yields and their ratio to the yields of long-lived particles. The measurements done using the ALICE detector will be compared with the corresponding results from models such as PYTHIA8, EPOS-LHC etc., and the measurements at lower energies.

        Speaker: Rutuparna Rath (Indian Institute of Technology Indore (IN))
        LHCP2021-Rutuparna-10June2021.pdf
        Zoom meeting link
      • 272
        LCSR application to radiative tau decay

        The non-perturbative QCD effects involved in radiative tau decay $(\tau^- \rightarrow \pi^- \nu_\tau \gamma)$ are encoded in two form factors; the vector ($F_V$) and the axial vector ($F_A$) form factors. We present the computation of these form factors using light cone sum rules. The form factors involved in this decay are same as involved in radiative pion decay with the crucial difference that the momentum transfer squared, $t$, between the pion-photon system is positive, which makes these form factors timelike and also as $t$ can now take values up to $m_\tau^2$, it can produce real hadronic resonances. We calculate the analytical form for these form factors using the method of light cone sum rules and present the decay width and the invariant mass spectrum in the $\pi-\gamma$ system. We found that the structure dependent parameter, $\gamma$, i.e. the ratio of the axial vector to vector form factor at zero momentum transfer to be in good agreement with the experimental determination.

        Speaker: Anshika Bansal (Physical Research Laboratory, Ahmedabad)
        LHCP21_Poster_anshika.pdf
        Poster video explanation
        Zoom meeting room
      • 273
        LFUV Tests at the Z Pole

        $b\to s\tau\tau$ and $b\to c\tau \nu$ measurements are highly motivated for addressing lepton-flavor-universality-violating (LFUV) puzzles, such as $R_{D^{(*)}}$, $R_{J/\psi}$ and $R_{K^{(\ast)}}$ anomalies, raised by the data of LHCb, BELLE and BarBar. The planned operation of future $e^-e^+$ colliders as a $Z$ factory provides a great opportunity to conduct such measurements, because of its relatively high production rates and reconstruction efficiency for $B$ mesons at $Z$ pole. Here we will pursue a systematic sensitivity study on these measurements at future $Z$ factories. The implications of the outcomes for LFUV new physics will be also explored.

        Speaker: LINGFENG LI (HKUST)
        LFU_Tests_at_the_Z_Pole_Full_Poster.pdf
        LFU Tests at the Z Pole.mp4
        LFU_Tests_at_the_Z_Pole_Small_Poster.pdf
        Zoom Meeting Room
      • 274
        Luminosity and beam-induced background measurement with the CMS tracker endcap pixel detector at HL-LHC

        The High Luminosity upgrade of the LHC (HL-LHC) places unprecedented requirements for background monitoring and luminosity measurements. The CMS Tracker Endcap Pixel Detector (TEPX) will be adapted to provide high-precision online measurements of bunch-by-bunch luminosity and beam-induced background. The implementation of dedicated triggering and readout systems, the real-time clustering algorithm on an FPGA and the expected performance are discussed. The innermost ring of the last layer (D4R1) will be operated independently from the rest of TEPX enabling beam monitoring during the LHC ramp and during unqualified beam conditions. The system optimisation and the dedicated timing and trigger infrastructure for D4R1 are also presented.

        Speaker: Peter Kicsiny (KIT - Karlsruhe Institute of Technology (DE))
        LHCP21_poster.pdf
        LHCP21_slides.pdf
        Zoom meeting room
      • 275
        Luminosity measurement at muon collider

        The precise determination of the luminosity in a collider is of crucial importance for any physics cross sections measurement since it directly translates to the precision of the cross section determination.
        In a muon collider dense muon beams are necessary to achieve the target luminosity, these beams generate very high fluxes of particles coming from the muons decay along the beam pipe.
        Due to the presence of ad-hoc shielding structure, designed to mitigate the effect of the beam-induced background, the forward region of the detector cannot host instrumentation for the determination of the luminosity, as in standard methods adopted by the LHC experiments.
        In this poster an alternative way to determine such a fundamental parameter is proposed, taking inspiration from flavour factories such as Belle2 and BES, where the luminosity is measured by counting $e^+$ $e^-$ $\to$ $e^+$ $e^-$ Bhabha events, whose cross-section is theoretically known with high precision.
        The reconstruction efficiency of large angle muon Bhabha ($\mu^+$ $\mu^-$ $\to$ $\mu^+$ $\mu^-$) events at 1.5 TeV center of mass energy is estimated at muon collider via full detector simulation, taking into account the beam-induced background effects.
        Kinematic requirements are defined to optimize the signal to physics background ratio and the statistical uncertainty on the muon collider luminosity measurement that can be reached with this method is estimated.

        Speakers: Carlo Giraldin (University of Padova), Laura Buonincontri (Universita e INFN, Padova (IT))
        Luminosity measurement at Muon Collider​.pdf
        Poster video explanation
        Zoom meeting room
      • 276
        LUXE: A new experiment to study non-perturbative QED in electron-LASER and photon-LASER collisions

        The LUXE experiment (LASER Und XFEL Experiment) is a new experiment in planning at DESY Hamburg using the electron beam of the European XFEL. LUXE is intended to study collisions between a high-intensity optical LASER and 16.5 GeV electrons from the XFEL electron beam, as well as collisions between the optical LASER and high-energy secondary photons. The physics objective of LUXE are processes of Quantum Electrodynamics (QED) at the strong-field frontier, where the electromagnetic field of the LASER is above the Schwinger limit. In this regime, QED is non-perturbative. This manifests itself in the creation of physical electron-positron pairs from the QED vacuum, similar to Hawking radiation from black holes. LUXE intends to measure the positron production rate in an unprecedented LASER intensity regime. An overview of the LUXE experimental setup is given, in the context within the field of high-intensity particle physics. The foreseen detector systems and their sensitivity are presented. Finally, the prospects for studying BSM physics are also discussed.

        Speaker: Federico Meloni (Deutsches Elektronen-Synchrotron (DE))
        LHCp2021_poster.pdf
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      • 277
        Mass Unspecific Supervised Tagging (MUST) for boosted jets

        Jet identification tools are crucial for new physics searches at the LHC and at future colliders. We introduce the concept of Mass Unspecific Supervised Tagging (MUST) which relies on considering both jet mass and transverse momentum varying over wide ranges as input variables - together with jet substructure observables - of a multivariate tool. This approach not only provides a single efficient tagger for arbitrary ranges of jet mass and transverse momentum, but also an optimal solution for the mass correlation problem inherent to current taggers. By training neural networks, we build MUST-inspired generic and multi-pronged jet taggers which, when tested with various new physics signals, clearly outperform the variables commonly used by experiments to discriminate signal from background. These taggers are also efficient to spot signals for which they have not been trained. Taggers can also be built to determine, with a high degree of confidence, the prongness of a jet, which would be of utmost importance in case a new physics signal is discovered.

        Speaker: João Seabra (Instituto Superior Técnico)
        MUST_LHCP2021.mp4
        Poster_LHCP2021.pdf
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      • 278
        Measurement of $\mathrm{D}$-meson production as a function of charged-particle multiplicity in proton-proton collisions at $\sqrt{s} = 13$ TeV with ALICE at the LHC

        Heavy quarks (charm and beauty) are produced at the initial stages of the relativistic hadronic collisions in hard scattering processes, and the study of their production in proton-proton (pp) collisions is an important test for calculations based on perturbative Quantum Chromodynamics (pQCD). Analysis of heavy flavor production as a function of charged-particle multiplicity provides insight into the processes occurring at the partonic level and the interplay between the hard and soft particle production mechanisms in pp collisions.

        In this poster, measurements of open heavy-flavor production as a function of multiplicity, via the study of the $\mathrm{D}$-meson self-normalized yields in pp collisions at the center-of-mass energy of $\sqrt{s} = 13$ TeV is presented. The $\mathrm{D}$-meson yields are measured in different $p_{\rm{T}}$ intervals from 1 GeV/$c$ to 24 GeV/$c$ at midrapidity via their hadronic decay channels. The $\mathrm{D}$-meson self-normalized yield is found to increase stronger than linearly with increasing charged-particle multiplicity. The measurements are compared to PYTHIA 8 calculations, and with the results at $\sqrt{s} = 7$ TeV.

        Speaker: Yoshini Bailung (Indian Institute of Technology Indore (IN))
        LHCP2021_Yoshini_v7.pdf
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      • 279
        Measurement of Bc(2S) and Bc(2S)* cross section ratios in proton-proton collisions at 13 TeV

        The ratios of the Bc(2S) to Bc, Bc(2S) to Bc, and Bc(2S) to Bc(2S) production cross sections are measured in proton-proton collisions at 13 TeV, using a data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 143 fb−1. The three measurements are made in the Bc meson phase space region defined by the transverse momentum pT > 15 GeV and absolute rapidity |y| < 2.4, with the excited Bc(2S) states reconstructed through the Bc π+π−, followed by the Bc → J/ψπ+ and J/ψ → μ+μ− decays. The Bc(2S) to Bc, Bc(2S) to Bc, and Bc(2S) to Bc(2S) cross section ratios, including the unknown Bc(2S) → Bcπ+π− branching fractions, are (3.47 ± 0.63 (stat) ± 0.33 (syst))%, (4.69 ± 0.71 (stat) ± 0.56 (syst))%, and 1.35 ± 0.32 (stat) ± 0.09 (syst), respectively. None of these ratios shows a significant dependence on the pT or |y| of the Bc meson. The normalized dipion invariant mass distributions from the decays Bc(2S) → Bc π+π− are also reported.

        Speaker: Manuel Alejandro Rodriguez Giraldo (Universidad de Antioquia (CO))
        ManuelRodriguezlhcp2021.pdf
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      • 280
        Measurement of Higgs boson production in association with a W or Z boson in the H->WW decay channel

        Recent measurements of the Higgs boson production cross section in the H->WW decay channel using proton-proton collision data with CMS experiment at 13 TeV will be presented. In particular the Higgs boson production in association with leptonically decaying vector bosons is targeted, and the H->WW decays in which at least one W boson decays to leptons are considered. Results for both the inclusive production cross section and cross sections in the STXS scheme will be presented.

        Speaker: Ms Sahithi Rudrabhatla (On behalf of the CMS Collaboration )
        lhcp 2021- page all final (1).pdf
        Zoom meeting room
      • 281
        Measurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptons in CMS

        The discovery of the Higgs boson in 2012 by the CMS and ATLAS collaborations marked the start of the exploration of the Higgs sector of particle physics. The properties of the Higgs sector under CP symmetry have been investigated mostly in its couplings to gauge bosons. With the full Run 2 data-taking period it became possible to study the CP properties of the Yukawa coupling of the Higgs to fermions, and in particular to tau leptons. This was done reconstructing the decay planes of the two tau leptons and measuring their angular correlation. The measured mixing angle between CP-even and CP-odd couplings is (4±17)° and is consistent with the Standard Model prediction of a pure CP-even coupling and allows to constrain the allowed phase space for possible BSM scenarios. A pure CP-odd hypothesis is instead excluded with 99.7% confidence level.

        Speaker: Andrea Cardini (Deutsches Elektronen-Synchrotron (DE))
        Poster-full-AndreaCardini-LHCP2021.pdf
        Poster-split-AndreaCardini-LHCP2021.pdf
        Slides-AndreaCardini-LHCP2021.pdf
        Video-PanelDescription.mp4
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      • 282
        Measurement of the four-top-quark production cross section in pp collisions at sqrt(s)=13 TeV with the ATLAS detector

        A measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider with an integrated luminosity of 139/fb is presented. A new result uses events with a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The measured four-top-quark production cross section is found to be 26 +17 -15 fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four-top-quark production cross section is measured to be 25 +7 -6 fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only predictions. The result is consistent within 2.0 standard deviations with the Standard Model expectation of 12.0 +/- 2.4 fb.

        Speaker: Martin Murin (University of Manchester (GB))
        Poster-Slides_LHCP2021_4top_Murin.pdf
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      • 283
        Measurement of tW production in the semileptonic channel in pp collisions at 13 TeV with CMS

        A measurement of the associated production of a single top quark and a W boson in the final states with an electron or muon and jets using pp collisions with $\sqrt{s} = 13$ TeV collected by the CMS detector at the CERN LHC is presented. The data used correspond to an integrated luminosity of 36 fb$^{-1}$ . This result is the first observation of the tW process in the final states containing a muon or electron and jets, with an observed significance clearly exceeding 5 standard deviations. The measured signal strength is μ = 1.24 ± 0.18, consistent with unity. The inclusive cross section is determined to be 89 ± 4 (stat) ± 12 (syst) pb.

        Speaker: Duncan Leggat (Chinese Academy of Sciences (CN))
        2021-06_lhcp_tWLjets_poster.pdf
        Poster video explanation
        Zoom meeting room
      • 284
        Measurements of differential and integrated fiducial cross sections for Higgs Boson production in the four-lepton decay channel using run 2 data with the CMS detector

        After the discovery of the Higgs boson and its characterisation, we are entering in the precision era of the Higgs physics where we need robust measurements to spot any sign of BSM physics. Among the many available tools, fiducial measurements are one of the most used in HEP due to their model independence, longevity, and easy comparison with theoretical predictions. The production cross section is measured by removing detector effects and backgrounds using an unfolding procedure.

        Integrated and differential fiducial cross sections for the production of the Higgs boson in pp collision at the LHC at a $\sqrt{s}$=13 TeV via the H$\rightarrow$ZZ$\rightarrow$4$\ell$ ($\ell$=$e$,$\mu$) channel are presented. The dataset was collected by the CMS experiment in 2016, 2017, and 2018, equivalent to a validated integrated luminosity of 137 fb$^{-1}$.

        Speaker: Alessandro Tarabini (LLR, École polytechnique (FR))
        TarabiniAlessandro_LHCP2021poster.pdf
        Video
        Zoom meeting room
      • 285
        Measurements of inclusive photons and charged particles at forward rapidities in p-Pb collisions at $\sqrt{s\rm_{NN}}$ = 5.02 TeV with ALICE

        At high energy collisions, such as those achieved at the LHC, particle production is dominated by soft-QCD processes. The soft production is described by non-perturbative QCD and challenges existing phenomenological models. Global observables such as multiplicity and rapidity dependence of particle production are some of the most fundamental measurements for improving and constraining these models.

        In this talk, we will present the multiplicity and pseudorapidity distributions of inclusive photons and charged particles at forward rapidities in p-Pb collisions at $\sqrt{s\rm_{NN}}$ = 5.02 TeV. The Photon Multiplicity Detector measures photon production within 2.3 < $\eta$ < 3.9. The Silicon Pixel Detector and the Forward Multiplicity Detector together measure charged particles over a wide range of -3.4 < $\eta$ < 5.0. Results on centrality evolution of particle production in p-Pb collisions will be presented both for photons and charged particles in comparison with phenomenological models (such as HIJING, DPMJET) based on different initial conditions and particle production mechanisms.

        Speaker: Mr Abhi Modak (Bose Institute (IN))
        2021-06-10-LHCP_poster_Abhi.pdf
        Zoom meeting room
      • 286
        Measurements of the inclusive and differential production cross sections of a top-quark–antiquark pair in association with a Z boson at sqrt(s) =13 TeV with the ATLAS detector

        An increasing center-of-mass energy of proton-proton collisions and higher luminosities at the CERN Large Hadron Collider make it possible to study rare processes of the Standard Model (SM). In this poster, the measurements of both the inclusive and differential cross sections of top-quark–antiquark production in association with a Z boson (ttZ) are presented. Collision data corresponding to a total integrated luminosity of 139/fb, recorded in years 2015-2018 with the ATLAS detector at a center-of-mass energy of 13 TeV are analysed. Both inclusive and differential measurements are performed by selecting final states with either three or four isolated leptons (electrons or muons). The inclusive cross section is measured to be 0.99 +/- 0.05 (stat.) +/- 0.08 (syst.)~pb, in agreement with the most precise theoretical predictions of the SM. In the differential measurements both absolute and normalised cross sections are measured as a function of a number of kinematic variables which probe the kinematics of the ttZ system. Differential measurements are performed at particle and parton levels for specific fiducial phase-space volumes and are compared with theoretical predictions at different levels of precision. Based on a chi^2/ndf and p-value compatibility comparison, good agreement is observed between the measured differential cross sections and the SM predictions.

        Speaker: Dominik Babal (Comenius University (SK))
        Poster video explanation
        ttZ_LHCP2021.pdf
        Zoom meeting room
      • 287
        Measurements of the weak diboson production cross sections in leptonic decays at 5.02 TeV with the CMS experiment

        We explore a new center-of-mass energy at 5 TeV, to study diboson production in proton-proton collisions using data collected with the CMS detector. The WW, WZ, and ZZ cross sections are measured analyzing events with two, three, or four charged leptons in the final state. These measurements are compared with the best available theoretical predictions and across other experiments.

        Speaker: Carlos Vico Villalba (Universidad de Oviedo (ES))
        LHCP2021_Dibosons5TeV.pdf
        Zoom session
      • 288
        Multi-charged TeV scale scalars and fermions in the framework of a radiative seesaw model

        Explaining the tiny neutrino masses and non-zero mixings have been one of the key motivations for going beyond the framework of the Standard Model (SM). We discuss a collider testable model for generating neutrino masses and mixings via radiative seesaw mechanism. That the model does not require any additional symmetry to forbid tree-level seesaws makes its collider phenomenology interesting. The model includes multi-charged fermions/scalars at the TeV scale to realize the Weinberg operator at 1-loop level. After deriving the constraints on the model parameters resulting from the neutrino oscillation data as well as from the upper bound on the absolute neutrino mass scale, we discuss the production, decay and resulting collider signatures of these TeV scale fermions/scalars at the Large Hadron Collider (LHC). We consider both Drell-Yan and photo-production. The bounds from the neutrino data indicate the possible presence of a long-lived multi-charged particle (MCP) in this model. We obtain bounds on these long-lived MCP masses from the ATLAS search for abnormally large ionization signature. When the TeV scale fermions/scalars undergo prompt decay, we focus on the 4-lepton final states and obtain bounds from different ATLAS 4-lepton searches. We also propose a 4-lepton event selection criteria designed to enhance the signal to background ratio in the context of this model.

        Speaker: Mr Avnish . (Institute of Physics)
        Model_Fermion-merged.pdf
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      • 289
        New ideas on detector technology for the ILC experiments

        Detector concepts are being developed for the foreseen electron-positron International Linear Collider (ILC) in Japan. Set to run as a Higgs Factory, ILC will address a rich scientific program from electroweak physics to BSM. The detectors are being optimized for precision physics in a range of energies between 90 GeV and 1 TeV. This poster will summarized the required performance of detectors, the proposed implementation and the readiness of different technologies needed for the deployment at ILC.

        Speaker: Mr Bohdan Dudar (DESY)
        Poster
        Poster video explanation
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      • 290
        New Small Wheel sTGC Front-End Electronics Integration and Commissioning for ATLAS Phase I Upgrade

        The ATLAS Muon Spectrometer is going through an extensive Phase I upgrade to cope up with the future LHC runs of high luminosity of up to 7.5×10$^{34}$ cm$^{-2}$s$^{-1}$. The innermost and first station of the Muon end cap system, the Small Wheel, will be replaced by the New Small Wheel, which has high trigger and precision tracking capabilities. This is achieved by a combination of two detector technologies, Small-Strip Thin Gas Chamber (sTGC) and Micro Mesh Gaseous structures (MM). MM is used for the precision tracking and sTGC is used as a primary trigger detector because of its timing resolution (drift time of most electrons shorter than one bunch crossing period (25 ns) and the front-end ASICs (Application Specific Integrated Circuit), VMMs, can make measurement with precision of 2 ns along with the amplitude measurement). We are working extensively on the integration and commissioning of the front-end electronics for the sTGC chambers. Considering the complexity of the system we are dealing with, we are working to resolve many challenges to test large number of physical channels (~354K) and ASICs (more than 11K) with three different types – pads, strips and wires. We will present our experiences with the trigger and the readout performance studies of the electronics.

        Speaker: Prachi Atmasiddha (University of Michigan, Ann Arbor)
        LHCP2021_poster_PrachiAtmasiddha.pdf
        Zoom meeting room
      • 291
        NNLO QCD study of polarised $W^+W^−$ production at the LHC

        Longitudinal polarisation of the weak bosons is a direct consequence of Electroweak symmetry breaking mechanism providing an insight into its nature, and is instrumental in searches for physics beyond the Standard Model. We perform a polarisation study of the diboson production in the $pp \to e^+ \nu_e \mu^- \bar\nu_\mu$ process at NNLO QCD in the fiducial setup inspired by experimental measurements at ATLAS. This is the first polarisation study at NNLO. We employ the double pole approximation framework for the polarised calculation, and investigate NNLO effects arising in differential distributions.

        Speaker: Andrei Popescu (University of Cambridge)
        Popescu_WW-Polarisation-Study_LHCP21.pdf
        Poster video introduction
        Zoom meeting room
      • 292
        Particle-yield modification in jet-like azimuthal V0–hadron correlations in Pb–Pb collisions at 5.02 TeV with ALICE at the LHC

        The measurement of azimuthal correlations between two particles is a powerful tool to investigate the properties of strongly-interacting nuclear matter created in ultra-relativistic heavy-ion collisions. In particular, studying the near-side and away-side hadron yields associated with trigger particles can provide important information to understand both the jet -medium interaction and hadron production mechanism. We study two-particle correlations with V0 (K0s, Λ/Λ ) and charge hadrons as trigger particles of transverse momentum 8 < pT,trig < 16 GeV/c,and associated charged particles of 1 GeV/c < pT,assoc < pT,trig at mid-rapidity in pp and Pb–Pb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. After subtracting the contributions of the flow background v2 and v3 , the per-trigger yields are extracted for two-particle azimuthal differences |∆φ| < 0.9 on the near-side and |∆φ − π| < 1.2 on the away-side.
        The ratio of the per-trigger yields in Pb–Pb collisions with respect to pp collisions , IAA, is measured in the near-side and away-side in the most central 0–10% collisions. On the near-side,a significant enhancement of IAA from 1.5 to 2 for different particles species is observed at the lowest pT,assoc. On the away-side, suppression to the level of (I AA ≈ 0.6 ) for pT,assoc>3 GeV/c is observed as expected from strong in-medium energy loss while an enhancement reaching 1.4
        at the lowest pT,assoc . The data are compared to AMPT, HIJING and EPOS models. Most calculations qualitatively describe the near-side and away-side yield modification at intermediate and high pT,assoc .

        Speaker: Mustafa Anaam (Central China Normal University CCNU (CN))
        Particle yield modification LHCP poster.pdf
      • 293
        Performance monitoring of the GE1/1 Triple-GEM detectors for the CMS Muon System

        The muon system of the CMS experiment has been instrumented with two wheels of triple-GEM detectors in order to ensure redundancy in the pseudo-rapidity region 1.55-2.2 so keeping the trigger rate at an acceptable level while not compromising the CMS physics potential in Run 3 of the LHC. The station, named GE1/1, provides two additional muon hit measurements which will improve the muon tracking and triggering performance in combination with the existing CSC detectors. As the commissioning phase of the detector is ongoing, prompt assessment of the muon detection performance is crucial for adjusting the operating parameters of the detector and its electronics. This contribution will present a set of analysis tools developed for the detector performance monitoring based on tools common to all the CMS muon subdetectors. Validation of the analysis based on simulations will be discussed, together with preliminary results obtained from cosmic-ray events.

        Speaker: Gabriele Milella (Universita e INFN, Bari (IT))
        MilellaSimone_LHCP2021_performance_monitoring_GEM_poster_v1.pdf
        Zoom meeting room
      • 294
        Performance of the Tile Calorimeter Demonstrator system for the ATLAS Phase-II Upgrade

        The High Luminosity Large Hadron Collider (HL-LHC) will deliver five times the LHC nominal instantaneous luminosity, after a series of upgrades that will take place during the shutdown of 2024 –2026. The ATLAS Hadronic Calorimeter (TileCal) will require the complete replacement of the readout electronics in order to accommodate its acquisition system to the increased radiation levels, trigger rates, and high pile-up conditions during the HL-LHC era.The upgraded readout electronics will digitize the PMT signals from every TileCal cell for every bunch crossing and will transmit them directly to the off-detector electronics. In the counting rooms, the off-detector electronics will store the calorimeter signals in pipelined buffers while transmitting reconstructed trigger objects to the first level of trigger at 40 MHz.The TileCal upgrade project has undergone an extensive R&D program and several test beam campaigns. A Demonstrator module has been assembled using the upgraded on-detector electronics and tested in the ATLAS experiment. The Demonstrator module is operated and read out using a prototype of Tile PreProcessor (TilePPr) which also permits integrating the Demonstrator module into the present ATLAS TDAQ system. This contribution presents the status and performance of the Demonstrator module in the ATLAS experiment.

        Speaker: Edward Khomotso Nkadimeng (University of the Witwatersrand (ZA))
        Performance of the TileCal Demonstator System for the ATLAS Phase-II Upgrade LHCP 2021.pdf
        Poster Explaination Tile Demonstrator system for the ATLAS Phase-II Upgrade.mp4
        Poster Landscape Performance of Tile Demonstrator system for the ATLAS Phase-II Upgrade.pdf
        ZOOM poster room
      • 295
        Physics motivations and detector upgrades for the new era of the ATLAS experiment

        With the end of RUN-II, the LHC has delivered only 4% of the collision data expected to be available during its lifetime. The next data-taking campaign - RUN-III - will double the integrated luminosity the LHC accumulated in 10 years of operation. The Run-III will be the herald of the HL-LHC era, an era when 90% of total LHC integrated luminosity (4 ab$^{-1}$) will be accumulated allowing ATLAS to perform several precision measurements to constrain the Standard Model Theory (SM) in yet unexplored phase-spaces and in particular in the Higgs sector, only accessible at LHC. Direct searches have so far provided no indication of new physics beyond the Standard Model, however, they can be complemented by indirect searches that allow extending the reach at higher scales. Indirect searches are based on the ability to perform very precise measurements, a highly complex task at a hadron collider that will require tight control of theoretical predictions, reconstruction techniques, and detector operation. Moreover, populating extreme regions of phase-space for multi-differential production cross-section analysis will require the development and validation of Monte Carlo phase-space biasing techniques and efficient integration methods to produce the billions of events needed to cope with higher luminosities.
        To answer the quest for high precision measurements in a high luminosity environment, a comprehensive upgrade of the detector and associated systems was devised and planned to be carried out in two phases. The Phase-I upgrade program foresees new features for the muon detector, for the electromagnetic calorimeter trigger system, and for all trigger and data acquisition chain and will operate to accumulate about 350 fb$^{-1}$ of integrated luminosity during the RUN-III. The RUN-III will mark the debut of a new trigger system designed to cope with more than 80 simultaneous collisions per bunch crossing. After this, ATLAS will proceed with the Phase-II upgrade to prepare for the high luminosity frontier where the ATLAS experiment will face more than 200 simultaneous collisions per bunch crossing and a high radiation level for many sub-systems. The Phase-II upgrade comprises a completely new all-silicon tracker with extended rapidity coverage that will replace the current inner tracker detector; the calorimeters and muon systems will have their trigger and data acquisition systems fully redesigned, allowing the implementation of a free-running readout system. Finally, a new subsystem called High Granularity Timing Detector will aid the track-vertex association in the forward region by incorporating timing information into the reconstructed tracks. A final ingredient, relevant to almost all measurements, is a precise determination of the delivered luminosity with systematic uncertainties below the percent level. This challenging task will be achieved by collecting the information from several detector systems using different and complementary techniques.
        The presentation will focus on physics goals within the reach of Run-III and on the status of ongoing detector upgrades. An outlook toward the HL-LHC challenges will also be presented.

        Speaker: Marisilvia Donadelli (Universidade de Sao Paulo (BR))
        ATL-COM-UPGRADE-2021-021.pdf
        Zoom meeting room
      • 296
        Physics Potential and Track Reconstruction of the FASER Experiment

        FASER (ForwArd Search ExpeRiment) is a new, small and inexpensive experiment designed to search for light, weakly interacting particles during Run 3 of the LHC. Such particles may be produced in large quantities in proton-proton collisions, travel for hundreds of meters along the beam axis, and can decay in two charged Standard Model particles. To reach its physics goals, a good hit resolution, and track reconstruction to separate the two closely-spaced, oppositely charged tracks is essential. In this poster, I review the physics discovery potential of FASER and the status of the track reconstruction, which is based on the ACTS toolkit. ACTS aims to provide an experiment-independent toolkit for track reconstruction.

        Speaker: Mr Tobias Boeckh (University of Bonn (DE))
        LHCP2021_Physics-potential-and-track-reconstruction-of-the-FASER-experiment.pdf
        poster-video-explanation.mp4
        Zoom meeting room
      • 297
        Playing cards as a tool to create public interest in physics

        A novel outreach project is presented that makes use of playing cards – one of the most ubiquitous toys around the world – to communicate physics in a fun, engaging manner. A custom deck of cards has been designed to inspire an interest in physics while being widely appealing to the general public and useful for gameplay, magic and cardistry. In the course of bringing this project to completion, many different social media platforms and channels are explored and used to facilitate communication about the project and physics in general. The project has presented opportunities for unusual collaborations. The cards will soon be in production and have excellent potential for use in outreach events and educational settings.

        Speaker: Jason Robert Veatch (Georg August Universitaet Goettingen (DE))
        LHCP2021_jveatch.pdf
        Zoom meeting room
      • 298
        Possibility of Total Ionizing Dose Effects measurements for LHC experiments elements in a medical facility: the TIFPA-INFN experience

        Total Ionizing Dose Effects tests and measurements are crucial requirements for solid state particle sensors and electronic control systems qualification in all the LHC present experiments and future upgrades.
        These measurements can be performed not only in facilities explicitly built for this mission, but with some wisdom, also in medical or biological research facilities when some minimum requirements are present. In this poster will be shown the pianification and realization of SiPM x-ray irradiations for TID measurements realized in the italian TIFPA-INFN Trento Center laboratory.
        In detail will be described the minimum flexibility required by the x-ray irradiation set-up, by the dose measurement system, the irradiation pianification and realization.
        Finally will be presented the limitations observed in these measurements, how can be minimized and the final results.

        Speaker: Dr Benedetto Di Ruzza (INFN - National Institute for Nuclear Physics (Italy))
        BenedettoDiRuzza_LHCP2021_poster.pdf
        BenedettoDiRuzza_LHCP2021_slides.pdf
        Zoom Poster Room
      • 299
        Precision from Diboson Processes at FCC-hh

        Thanks to its high luminosity and center of mass energy, the future FCC-hh collider will allow us to probe processes with clean but rare final states that are unaccessible at the LHC. The study of diboson production processes poses a promising way of indirectly constraining New Physics in the context of the Higgs Boson. Specifically, the diphoton leptonic decay channels of the Wh and Zh production processes are examples for the aforementioned clean but rare final states. I will discuss our study of these channels at the FCC-hh in the SMEFT framework and how doubly differential distributions can be used to gain even better sensitivity to certain higher dimensional EFT operators.

        Speaker: Philipp Englert (DESY Hamburg)
        LHCP2021_Englert.pdf