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14th Edition of the Large Hadron Collider Physics Conference (LHCP 2026)

→ Europe/Zurich
Auditorium (CICSU)

Auditorium

CICSU

Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
Wolfgang Adam (HEPHY-Vienna), Guy Wilkinson (University of Oxford (GB)), Julie Malcles (IRFU-CEA, Université Paris-Saclay (FR)), Giovanni Marchiori (APC, CNRS/IN2P3 and Université Paris Cité)
Description

 

The Fourteenth Annual Large Hadron Collider Physics (LHCP2026) conference
will take place in Paris from 18 to 22 May 2026

 

Registrations start on Monday 18 May at 8 am, and the conference starts at 8:45. No registration on Sunday (university closed)

 

 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, with recent results of the LHC Run II and Run III, 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.

The conference will take place in the International Conference Centre of Sorbonne Université (CICSU).

Warning: Please beware! Some participants may receive fraudulent emails claiming to be from a company tasked with arranging accommodations for participants. These emails are scams.

POSTER ABSTRACTS

Abstract submissions with proposals for theory and experimental posters are invited. Please follow the instructions in the Call for poster abstracts. 

IMPORTANT DATES AND DEADLINES
Registration & Payment deadlines
 
  - Regular Registration & Payment Deadline
(500 euros Standard & 310 euros PhD)		 Friday 10 April 2026 
  - Start of Late Registration & Payment
(550 euros Standard & 360 euros PhD)		 Saturday 11 April 2026 
  - Final Registration Friday 01 May 2026 
Early Career Researcher / Least Developed Country Grant Application  
  - application deadline Wednesday 25 March 2026
  - grant acceptance notification Wednesday 01 April 2026
Poster abstract submission  
  - submission deadline Friday 20 March 2026
  - acceptance notification Monday 30 March 2026 at the latest

Start of the conference

 Monday 18 May 2026
Proceedings submission deadline Wednesday 30 September 2026
LHCP2026_18Monday_News.pdf
LHCP2026_19Tuesday_News.pdf
LHCP2026_20Wednesday_News.pdf
LHCP2026_21Thursday_News.pdf
LHCP2026_22Friday_News.pdf
lhcp2026-wifi.pdf
Bulletins
LHCP2026 support
  • Monday 18 May
    • 08:00
      Registration Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Plenary Session Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Convener: Guy Wilkinson (University of Oxford (GB))
    • 10:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Plenary Session Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Convener: Julie Malcles (IRFU-CEA, Université Paris-Saclay (FR))
    • 12:45
      Lunch Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Parallel : EWK Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Camilla Vittori (Universita e INFN, Bologna (IT)), Ezra Lesser (Los Alamos National Laboratory), Mario Pelliccioni (Pavia University and INFN (IT)), Mathieu Pellen (University of Freiburg (DE))
    • Parallel : Higgs Physics: Higgs properties and precision measurements Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Emanuele Di Marco (INFN, Roma 1 (IT)), Ezra Lesser (Los Alamos National Laboratory), Johannes Alf Braathen (DESY), Valentina Cairo (CERN)
      • 14
        Measurements of Higgs boson mass and width with $\sqrt{s}$ = 13 TeV data (ATLAS and CMS)

        The presentation focuses on complete LHC Run2 results, including combinations of various channels - CMS speaker (15' presentation + 3' discussion)

        Speaker: Pedro Fernandez Manteca (CERN)
        260518_LHCP2026.pdf
      • 15
        Higgs boson cross-section measurements with $\sqrt{s}=$ 13.6 TeV (ATLAS+CMS)

        LHC Run3 results focus, including updates on Run 3 physics objects reconstruction, identification & dedicated triggers - ATLAS speaker (15' presentation + 3' discussion)

        Speakers: Yanping Huang (Chinese Academy of Sciences (CN)), Yanping Huang (Chinese Academy of Sciences (CN))
        2026_LHCP_v4.pdf
      • 16
        Study of Higgs coupling CP properties and measurements of vector boson polarization in H->VV decays at the LHC (ATLAS+CMS)

        Including EFT and anomalous couplings interpretations - ATLAS speaker (15' presentation + 3' discussion)

        Speaker: Ryan Roberts (University of Chicago (US))
        Roberts_LHCP_261805.pdf
      • 17
        Building CP observables for the Higgs-Top coupling

        15' presentation + 3' discussion

        Speakers: Marco Menen, Marco Menen (Leibniz Universität Hannover)
        LHCP2026_Menen.pdf
      • 18
        Joker experimental talk (CMS results)

        15' presentation + 3' discussion - CMS speaker

        Speaker: Paul Gaigne (Université Paris-Saclay (FR))
        LHCP_Hgg_mass_Gaigne.pdf
    • Parallel : QCD Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Davide Zuliani (Universita e INFN, Padova (IT)), Jesse Liu (New York University), Rene Poncelet (IFJ PAN Krakow)
      • 19
        CMS measurements of precision jet physics and performance
        Speaker: Argyro Ziaka (University of Ioannina (GR))
        LHCP2026_CMS_jets_physics.pdf
      • 20
        Theoretical status of jet cross sections
        Speaker: MATTEO MARCOLI (University of Durham)
        Marcoli_LHCp_2026.pdf
      • 21
        ATLAS measurements of precision jet physics and performance
        Speaker: Wenhao Ma (University of Science and Technology of China (CN))
        wenhao_LHCP.pdf
      • 22
        Theoretical status of energy-energy correlators
        Speakers: Dr Jack Holguin (The University of Manchester), Jack Holguin
        LHCP.pdf
      • 23
        LHCb measurement of precision jet physics
        Speaker: Manuel Ramirez Garcia (University of Michigan (US))
        MRG_PrecisionJets_LHCb.pdf
    • Parallel : TeV Scale and prompt signatures: SUSY and Prompt DM Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Arne Christoph Reimers (CERN), Daniel Hayden (Michigan State University (US)), Giacomo Cacciapaglia
      • 24
        Recent ATLAS results on searches with prompt DM candidates/mediators
        Speaker: Mark Hodgkinson (University of Sheffield (GB))
        LHCP_2026_mhodgkin.pdf
      • 25
        Recent CMS results on searches with prompt DM candidates/mediators
        Speaker: Hugues Evard (Universite Libre de Bruxelles (BE))
        26_05_18_CMS_prompt_DM.pdf
      • 26
        Recent ATLAS results on searches for prompt SUSY
        Speaker: Yang Liu (Sun Yat-Sen University (CN))
        Prompt SUSY Search.pdf
      • 27
        Recent CMS results on searches for prompt SUSY
        Speaker: Halil Saka (University of Cyprus (CY))
        LHCP2026_HS_v5.pdf
    • Parallel : Upgrade: Physics Reach Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Isabella Sanna (CERN), Roberta Cardinale (INFN e Universita Genova (IT))
    • 15:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Plenary Session: Upgrade and CERN overview Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Convener: Giovanni Marchiori (APC, CNRS/IN2P3 and Université Paris Cité)
    • 18:30
      Welcome reception Salle des fêtes (Mairie du 5e arrondissement)

      Salle des fêtes

      Mairie du 5e arrondissement

      21 place du Panthéon, 75005 Paris

      See https://indico.cern.ch/event/1537360/page/42714-welcome-reception for more details

  • Tuesday 19 May
    • Plenary Session: BSM searches Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Convener: Fabio Cerutti (Lawrence Berkeley National Lab. (US))
    • 10:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Parallel : EWK Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Camilla Vittori (Universita e INFN, Bologna (IT)), Ezra Lesser (Los Alamos National Laboratory), Mario Pelliccioni (Pavia University and INFN (IT)), Mathieu Pellen (University of Freiburg (DE))
      • 41
        Electroweak Cross Sections at CMS
        Speaker: Marco Cipriani (Universita & INFN Pisa (IT))
        WandZ_LHCP2026_cipriani.pdf
      • 42
        Electroweak cross sections at LHCb
        Speaker: Luke Grazette (University of Warwick (GB))
        lugrazet__LHCP__xsecs.pdf
      • 43
        Recent constraints on anomalous quartic boson couplings in ATLAS
        Speaker: John Patrick Mc Gowan (University of Victoria (CA))
        LHCP_2026-6.pdf
      • 44
        Theory calculations for DY/V+jet, QCD only
        Speakers: Tobias Neumann (Southern Methodist University), Tobias Neumann (Southern Methodist University), Tobias Neumann (William & Mary)
        Neumann_Tobias.pdf
      • 45
        Overview on theory calculations for DY (mixed and electroweak corrections)
        Speaker: Simone Devoto (Universiteit Gent)
        Devoto_LHCP_parallel.pdf
    • Parallel : Flavor Physics Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Chiara Ilaria Rovelli (Sapienza Universita e INFN, Roma I (IT)), Conor Fitzpatrick (The University of Manchester (GB)), Cristina Terrevoli (Universita e INFN, Bari (IT)), Yue Xu (University of Washington (US))
    • Parallel : QCD Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Davide Zuliani (Universita e INFN, Padova (IT)), Jesse Liu (New York University), Rene Poncelet (IFJ PAN Krakow)
    • Parallel : TeV Scale and prompt signatures: New approaches Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Arne Christoph Reimers (CERN), Daniel Hayden (Michigan State University (US)), Giacomo Cacciapaglia
      • 58
        Anomaly detection for new physics
        Speaker: Aritra Bal (KIT - Karlsruhe Institute of Technology (DE))
        LHCP2026_BAL.pdf
      • 59
        New approaches to naturalness
        Speaker: Pablo Sesma (IFAE)
        New Approaches to Naturalness.pdf
      • 60
        Recent results with novel data-taking methods (ATLAS+CMS)
        Speaker: Falk Bartels (Heidelberg University (DE))
        Bartels_novel_searches.pdf
      • 61
        Recent CMS results from anomaly detection searches
        Speaker: Jannicke Pearkes (University of Colorado Boulder (US))
        2026_05_19_LHCP.pdf
      • 62
        Recent ATLAS results from anomaly detection searches
        Speaker: Nicholas Luongo (Argonne National Laboratory (US))
        LHCP_Luongo.pdf
    • Parallel : Upgrade: Lessons learned and upcoming challenges Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Isabella Sanna (CERN), Roberta Cardinale (INFN e Universita Genova (IT))
    • 12:30
      Lunch Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Parallel : EWK Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Camilla Vittori (Universita e INFN, Bologna (IT)), Ezra Lesser (Los Alamos National Laboratory), Mario Pelliccioni (Pavia University and INFN (IT)), Mathieu Pellen (University of Freiburg (DE))
      • 68
        Multiboson measurements at ATLAS
        Speaker: Zhuolin Zhang (Shandong University (CN))
        LHCP2026_Zhuolin.pdf
      • 69
        Multiboson measurements at CMS
        Speaker: Ruobing Jiang (Peking University (CN))
        LHCP-2026_final.pdf
      • 70
        Theory overview of SMEFT in the EWK sector
        Speaker: Ken Mimasu (University of Southampton)
        Mimasu_SMEFT_LHCP.pdf
      • 71
        Theory overview of di-boson and tri-boson production
        Speaker: Doreen Wackeroth
        LHCP2026.pdf
    • Parallel : Flavor Physics: Flavor Physics - "HF production and spectroscopy" Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Chiara Ilaria Rovelli (Sapienza Universita e INFN, Roma I (IT)), Conor Fitzpatrick (The University of Manchester (GB)), Cristina Terrevoli (Universita e INFN, Bari (IT)), Yue Xu (University of Washington (US))
    • Parallel : Higgs Physics: Higgs+b/c-jets Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Emanuele Di Marco (INFN, Roma 1 (IT)), Ezra Lesser (Los Alamos National Laboratory), Johannes Alf Braathen (DESY), Valentina Cairo (CERN)
      • 78
        Higgs boson + $b/c$-jets, focusing on tagging tools (ATLAS)

        Focusing on the novel techniques and performance in LHC Run3, with perspectives for HL-LHC - ATLAS speaker (15' presentation + 3' discussion)

        Speaker: Song-Ming Wang (Academia Sinica (TW))
        LHCP2026_songmingwang_v0.pdf
      • 79
        Higgs boson + $b/c$-jets, focusing on tagging tools (CMS)

        Focusing on the novel techniques and performance in LHC Run3, with perspectives for HL-LHC - CMS speaker (15' presentation + 3' discussion)

        Speaker: Giovanni Celotto (University of Zurich (CH))
        LHCP26_higgs_to_bc_jets_CMS.pdf
      • 80
        Higgs->bb/cc studies at LHCb and future prospects

        Focusing on the novel techniques and performance in LHC Run3, with perspectives for HL-LHC - LHCb speaker (15' presentation + 3' discussion)

        Speaker: Davide Zuliani (Universita e INFN, Padova (IT))
        higgsbc_LHCP.pdf
      • 81
        Higgs boson + $b/c$-jets (Theory)

        15' presentation + 3' discussion
        https://cern.zoom.us/j/66151856989?pwd=5xvDkejJYiaME8fCGXycXbe1HHZ7Yy.1

        Speaker: Rebecca von Kuk (Univerisity of Bern)
        LHCP2026_RvK.pdf
    • Parallel : QCD Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Davide Zuliani (Universita e INFN, Padova (IT)), Jesse Liu (New York University), Rene Poncelet (IFJ PAN Krakow)
      • 82
        ALICE measurements of strangeness production and hadronization
        Speaker: Francesca Ercolessi (Universita e INFN, Bologna (IT))
        FErcolessi_LHCP2026.pdf
      • 83
        Theoretical status of EPOS LHC
        Speaker: Dr Tanguy Pierog
        Pierog_EPOS_LHC-R.pdf
      • 84
        ATLAS measurements of soft and nonperturbative QCD
        Speakers: Leszek Adamczyk (AGH University of Krakow (PL)), Leszek Adamczyk (AGH University of Science and Technology (PL))
        Leszek_Adamczyk.pdf
      • 85
        Theoretical status of hadronization in Monte Carlo
        Speaker: Gregory Soyez (IPhT, CEA Saclay)
        ps-and-resummations.pdf
      • 86
        CMS measurements of soft and nonperturbative QCD
        Speaker: Javier Llorente Merino (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))
        llorenteQCD.pdf
    • Parallel Joint Session : Upgrade + Performance and ML/AI (in Upgrade) Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Isabella Sanna (CERN), Roberta Cardinale (INFN e Universita Genova (IT))
    • 15:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Poster session Patio and Auditorium Hall

      Patio and Auditorium Hall

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      • 92
        1. Multiplicity dependence of prompt and non-prompt J/$\psi$ production in pp collisions with ALICE

        Quarkonia -- bound states of heavy quark-antiquark pairs (charm or bottom) -- offer a unique probe of both perturbative and non-perturbative QCD. While the hard-scale production of the quark-antiquark pairs is calculable via perturbation theory, their hadronization into bound states requires non-perturbative models like NRQCD. In hadronic collisions, the underlying event activity, usually quantified in terms of charged-particle multiplicity density, is mainly determined by soft particle production processes. By correlating measurements of quarkonium production and event activity in small systems, we can learn more about the interplay between hard and soft particle production in initial-state and final-state effects. In addition, separating prompt and non-prompt J/$\psi$ helps to study separately the charm and beauty sectors. Finally, measuring the multiplicity in different azimuthal regions with respect to the J/$\psi$ emission direction allows to disentangle the effects of the particles emitted in the same production process as the J/$\psi$ and of the underlying event.

        In this poster, recent measurements of prompt and non-prompt J/$\psi$ production by the ALICE Collaboration at midrapidity as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}=13$ TeV will be presented.

        Speaker: Gauthier Legras (Universität Münster (DE))
        PosterLHCP2026_glegras_v3.pdf
      • 93
        2. Under-coverage in high-statistics counting experiments with finite MC samples

        We consider a common situation in High Energy Physics (HEP) analyses: performing a maximum-likelihood fit of a physics model to a binned data set with high-statistics, with the goal of setting confidence intervals on a parameter of interest in the presence of systematic uncertainties modeled as nuisance parameters. We focus on the case when the physics model is determined from Monte Carlo (MC) simulated samples. Typically for HEP analyses, the size of the MC samples is equal or a few times larger than the data sample size, as the former are computationally expensive to produce.

        We show that a surprising statistical effect can occur due to statistical fluctuations in the MC templates, even in cases that would be considered high-statistics, leading to the underestimation of the uncertainty on the parameter of interest (under-coverage). This happens despite using well established treatments to account for the finite size of MC samples, such as the Barlow-Beeston approach.

        We start by exemplifying the effect in a toy study and then look at the problem more generally to understand its cause. The explanation is the following: when a variation in the value of the parameter of interest has a similar effect on the studied distribution as a variation in a nuisance parameter (or a combination of them), fluctuations in the MC templates can affect the coverage of confidence intervals constructed in the asymptotic approximation always in the same direction, namely they lead to systematic under-coverage. Further details can be found in the article that we published: “Under-coverage in high-statistics counting experiments with finite MC samples”, C. A. Alexe et al., Nucl. Instrum. Meth. A 1086 (2026) 171360, doi:10.1016/j.nima.2026.171360.

        We suggest methods for diagnosing whether a certain analysis has this problem, and possible solutions. A notable example where the presented under-coverage effect had to be accounted for is the recent measurement of the W boson mass by the CMS Collaboration using part of the LHC Run 2 data. The effect will become relevant as analyses increase in data size and complexity, for example as unprecedented amounts of data will be analyzed from the complete LHC Run 3 and the Hi-Lumi era.

        Speaker: Cristina Alexe (Scuola Normale Superiore & INFN Pisa (IT))
        Alexe Poster LHCP26 (1).pdf
      • 94
        3. Probing the High-$p_T$ Higgs Sector: First ATLAS Measurement of Highly Boosted H→ττ events in Run 2 and partial Run 3

        The decay of the Higgs boson into a pair of tau leptons offers direct insight into the Yukawa coupling hierarchy of the Standard Model. Probing this process in the high transverse momentum regime ($p_T$ > 300 GeV) is critical for constraining new physics, yet standard resolved reconstruction algorithms struggle to resolve the increasingly collimated decay products. We presents the first ATLAS analysis with a targeted measurement of the production of a highly boosted $H \rightarrow \tau_{had}\tau_{had}$ events utilizing the Run 2 and partial Run 3 dataset. To overcome kinematic reconstruction challenges, this analysis employs a dedicated boosted di-tau algorithm coupled with a novel tagger based on a hybrid transformer and Graph Neural Network architecture that significantly suppresses fake backgrounds. We measure the inclusive cross-section of $H \rightarrow \tau_{had}\tau_{had}$. Furthermore, we present an extended Simplified Template Cross Sections (STXS) measurement to refine the granularity of high-pT gluon-gluon fusion production. This work provides the first evidence of H→ττ production in the highly boosted regime and establishes robust tools and a template for future boosted tau topology measurements.

        Speaker: Ali Garabaglu (University of Washington (US))
        LHCP_Poster.pdf
      • 95
        4. Measurement of the transverse-momentum fraction of (multi-)strange particles in mini-jets and its multiplicity dependence in pp collisions at $\sqrt{s} = 13$ TeV with ALICE

        The enhancement of the strange baryon-to-meson yield ratio at intermediate transverse momentum ($p_{\rm T}$) observed by ALICE across small to large collision systems is usually considered to be driven by collective radial flow and quark recombination effects. Nevertheless, it remains under discussion whether jet fragmentation also contributes to the observed enhancement, as strange particles in the enhanced $p_{\rm T}$ range may also come from low-energy partons. ALICE has previously measured the production rates of (multi-)strange particles in high-energy jets in pp and p--Pb collisions to probe the hadronization mechanism in small systems. Recently, ALICE investigated the momentum fraction carried by the (multi-)strange particles with respect to their originating partons using a novel angular correlation method. This method allows access to a significantly lower-$p_{\rm T}$ region and provides further insights into the hadronization process.

        In this contribution, the average transverse-momentum fractions ($\langle z \rangle$) of the strange particles in mini-jets in pp collisions at $\sqrt{s} = 13$ TeV are reported as a function of the strange particles' $p_{\rm T}$. The observed $\langle z \rangle$ values suggest that (multi-)strange particles are predominantly produced via fragmentation of low-energy partons. Furthermore, the charged-particle multiplicity dependence of $\langle z \rangle$ is presented. No significant multiplicity dependence is observed for $\Lambda(\overline{\Lambda})$ and $\Xi^{-}(\overline{\Xi}^{+})$, challenging the picture where the quark recombination is considered as a dominating production mechanism in high-multiplicity hadronic collisions.

        Speaker: Lang Xu (Institute of Particle Physics, CCNU (CN); Institute of physics of 2 infinities of Lyon, UCBL (FR))
        LHCP2026_Poster_V3.3_langxu.pdf
      • 96
        5. Exploring Higgs EFT in $t\bar{t}hh$ at the High-Luminosity LHC.

        The non-resonant production of a Higgs boson pair in association with a top–antitop quark pair ($pp \to t\bar{t}hh$) has only recently begun to be explored at the Large Hadron Collider and provides a unique and largely uncharted probe of the top–Higgs sector, offering complementary sensitivity to the Higgs self-coupling and higher-dimensional interactions beyond the Standard Model. In this work, we present a detailed study of this process within the framework of Higgs Effective Field Theory (HEFT) at the High-Luminosity LHC. A comparative analysis is performed using a traditional cut-based approach in the single-lepton channel and a multivariate parametric boosted decision tree method in both single-lepton and dilepton final states. We derive one- and two-parameter limits at 95% confidence level on the HEFT couplings $\delta\kappa_{\lambda}$, $c_2$, $c_{2g}$, and $c_{tg}$. The projected bound on $\delta\kappa_{\lambda}$ is weaker than current experimental constraints from dedicated Higgs-pair measurements; however, this coupling plays a critical role in shaping the multidimensional allowed parameter space. For the remaining HEFT couplings, where no direct experimental limits currently exist, our results provide the first sensitivity projections in the $t\bar{t}hh$ channel. Overall, this study demonstrates the strong potential of the $t\bar{t}hh$ production process to probe extended Higgs and top-quark interactions beyond the Standard Model at the HL-LHC.

        Speaker: Dr RAFIQUL RAHAMAN (Institute of Physics, University of Sao Paulo)
        lhcp-poster.pdf
      • 97
        6. Distinguishing heavy neutrino chiral couplings in W′ decays using jet substructure at the HL-LHC

        The search for heavy $W'$ bosons in their decay modes to a lepton and a heavy neutrino offers a promising avenue for probing new physics beyond the Standard Model. This work focuses on such a signature with an energetic lepton plus a fat jet, originating from the heavy neutrino and containing a lepton. We have employed the jet substructure techniques to isolate the embedded lepton as a subjet of the fat jet. The Lepton Subjet Fraction ($LSF$) and Lepton Mass Drop ($LMD$) variables constructed from the lepton subjet help in separating the signal region from the background. We further study the polarization properties of the $W'$ coupling to the lepton and heavy neutrino through the decay products of the neutrino. Instead of relying on a specific model, we employ generic couplings and explore the discrimination power. Jet substructure-based angular variables $z_\ell$, $z_\theta$, and $z_k$ are combined to form BDT scores to obtain a better separation power between the left-chiral ($V-A$) and right-chiral ($V+A$) coupling configurations. By using $CL_s$ type profile likelihood estimator, we could achieve 1.6$\sigma$ - 2.8$\sigma$ significance of excluding one coupling configuration in favour of the other.

        Speaker: Songshaptak De (Jožef Stefan Institute)
        LHCP2026_Poster_SD.pdf
      • 98
        7. Multi-boson splashes at future colliders from electroweak compositeness

        We propose a new collider signature for the composite origin of the electroweak symmetry breaking of the standard model. The Higgs sector consists of new fundamental fermions (hyper-quarks), which confine at a hadronization scale $\Lambda_{HC} \sim$ few TeV. At energies above $\Lambda_{HC}$, the Drell-Yan production of the hyper-quarks leads to the production of a few electroweak bosons, in analogy with hadron production in QCD at $e^+e^- \to q\bar{q}$ around a few GeV. We show that this regime can be probed at future colliders, namely the proposed 100 TeV hadron collider (FCC-hh) and a 10 TeV muon collider. Together with the direct discovery of electroweak resonances, the multi electroweak boson signature provides a smoking gun for Higgs compositeness.

        Speakers: Abhishek Kumar Singh, Abhishek Kumar Singh, Abhishek Kumar Singh (Indian Institute Of Technology Delhi)
        Abhishek_LHCP_poster.pdf
      • 99
        8. Continuous Calibration of ATLAS Flavour-Tagging Classifiers via Optimal Transport Maps

        Algorithms to identify jets from b-hadrons (b-jets) are widely in use in ATLAS and are crucial for measurements and searches targeting processes with top quarks or Higgs bosons in the final state, for instance, b-tagging played a central role in the observation of the Higgs boson decay into bottom quarks. These b-tagging algorithms are trained on simulation, therefore, their performance in data has to be checked and corrections for simulations have to be derived. Traditionally, operating points using intervals of fixed b-tagging efficiencies are defined such that calibrations can be performed in these intervals. However, this limits the flexibility in the application of the algorithms in analyses. This work introduces a continuous calibration of the ATLAS DL1r flavour-tagging algorithm using optimal transport maps. The simulated flavour-tagging classifier outputs (probabilities for b-, c-, and light-flavour jets) are transformed to match the observed data distributions, minimizing alterations to the simulation while achieving closure with data. The calibration is derived as a function of the jet transverse momentum using high-purity samples of b-jets from top-antitop events in ATLAS Run 2 data, employing neural solvers to approximate the optimal transport maps. This approach provides a fully continuous, three dimensional calibration of flavour probabilities, removing the need for discrete operating points and opening new possibilities for high-dimensional corrections in ATLAS analyses, therefore enhancing the precision of measurements and the sensitivity of searches for new physics.

        Speaker: Alessandro Montella (Stockholm University (SE))
        Continuous_Calibration_of_ATLAS_Flavour-Tagging_Classifiers_via_Optimal_Transport_Maps_LHCP2026_montella_alessandro.pdf
      • 100
        9. Development of the ATLAS Liquid Argon Calorimeter Readout Electronics for the HL-LHC

        The High-Luminosity LHC is set to begin operations for physics around 2030, enabling the collection of ten times more data than will have been accumulated by the LHC. The resulting increase in pile-up, radiation exposure, and data volume requires a comprehensive upgrade of both the on‑detector and off‑detector electronics of the ATLAS Liquid Argon (LAr) Calorimeter to maintain excellent energy and timing performance within the new trigger and data acquisition architecture.

        On-detector, the complete replacement of the Front-End Boards (FEBs) and Calibration Boards is in progress. The redesigned FEBs amplify, shape, and digitize calorimeter ionization signals at 40 MHz using two gain scales, achieving an effective 16‑bit dynamic range with 11‑bit precision. This is enabled by custom radiation‑hard Preamplifier/Shaper and ADC ASICs. The new Calibration Board injects precision pulses with <0.1% non-linearity, 0.25% inter‑channel variation, and rise times below 1 ns, using two dedicated ASICs (LADOC and CLADOC). Prototype boards and ASIC test procedures are in advanced validation ahead of large‑scale production of approximately 1,500 units, scheduled to be installed starting 2027.

        Off‑detector, the upgraded digital processing chain is built around the ATCA‑compliant Liquid Argon Signal Processor (LASP). Each of the 278 LASP modules receives 40 MHz digitized samples over 33,000 optical links, totalling 345 Tbps. Two high‑performance Agilex FPGAs per module execute real‑time energy and time reconstruction, forwarding low‑latency energy sums to the hardware trigger while buffering the full data stream pending trigger acceptance. To address the significantly increased pile‑up, advanced neural‑network‑based reconstruction algorithms are being implemented in firmware to separate overlapping pulses. Data transmission to the acquisition system is handled by the Smart Rear Transition Module, while system timing and control of up to 72 on‑detector boards is provided by the compact LATOURNETT board.

        This contribution presents the integrated architecture, performance validation, and latest hardware and firmware developments across the full LAr calorimeter electronics upgrade for HL‑LHC operation.

        Speaker: Olivier Salin (Université Paris-Saclay)
        LAr_Phase2_Upgrade_LHCP2026_Olivier_Salin.pdf
      • 101
        10. The ATLAS Inner Tracker Upgrade

        The ATLAS experiment is currently preparing for an upgrade of the Inner Tracking for High-Luminosity LHC operation, scheduled to start in 2030. The radiation damage at the maximum integrated luminosity of 4000/fb implies integrated hadron fluencies over 2x1016neq/cm2 and tracking in a very dense environment call for a replacement of the existing Inner Detector. An all-silicon Inner Tracker (ITk) is proposed with a pixel detector surrounded by a strip detector. After an extensive prototyping phase, all the institutes involved in the ITk are currently in pre-production phase, moving toward production mode. In this contribution we present the design of the ITk Detector and its expected performance. An overview of the current status of the various detector components, both pixel, strip and the other common items, focusing on the preparation for production, with its more challenging aspects, will be summarized.

        Speaker: Shubham Gupta (Brandeis University (US))
        LHCP_2026.pdf
      • 102
        11. Reconstruction of overlapping electromagnetic showers in calorimeters using transformers

        Accurate clustering of electromagnetic energy deposits is essential for reconstructing photons and electrons in modern hadron collider experiments, where boosted topologies and pileup often cause overlapping showers and ambiguous energy assignment. We present deep learning-based clustering approaches that reconstruct particle energy and impact position directly from calorimeter readout. The study includes a two-step strategy in which candidate seed windows are identified and then jointly processed via distance-weighted message passing or attention mechanism, and a single-step graph transformer, ClusTEX, which performs candidate selection and reconstruction in one inference stage. ClusTEX uses a novel positional encoding scheme that separates local coordinates within the graph from global detector coordinates, enabling efficient, geometry-aware inference. Models are trained on Geant4 simulations of a simplified (toy) calorimeter and real ECAL-inspired topology with an explicit $(\eta, \phi)$ dependence. In the toy calorimeter, attention-based interactions improve the reconstruction of overlapping showers relative to both the standard algorithm and distance-driven message passing, while maintaining performance on isolated photons. In the ECAL-inspired topology, ClusTEX provides the best overall performance compared to two-step approaches and the standard algorithm and it also remains robust under localized detector failures, showing improved stability and partial recovery of energy in non-responsive channels. Overall, in boosted $\pi^0 \to \gamma\gamma$ events, the two-step attention-based model and, as an extension, the single-step transformer model retains di-photon mass reconstruction capability, where the standard algorithm becomes inefficient.

        Speaker: Yuliia Maidannyk (Université Paris-Saclay (FR))
        poster-clustex.pdf
      • 103
        12. Strangeness Production in Small Collision Systems with the ALICE Experiment

        (For ALICE Collaboration)

        Understanding the origin of strangeness enhancement in high-energy hadronic collisions remains one of the central open questions in particle production at the Large Hadron Collider (LHC). Measurements in small collision systems, such as proton–proton (pp) and proton–lead (p–Pb), have revealed striking features traditionally associated with heavy-ion collisions, including collective-like behaviour and enhanced production of strange and multi-strange hadrons. Remarkably, these effects appear to scale with event multiplicity rather than with the size of the colliding system, challenging the conventional interpretation of strangeness enhancement as a unique signature of quark–gluon plasma formation.

        The upgraded ALICE detector in Run 3 opens a new precision era for such studies, enabling high-statistics measurements of light-flavour and (multi-)strange hadron production across an extended range of collision energies and event multiplicities. In this contribution, we present new results from pp collisions at √s = 0.9 TeV and √s = 13.6 TeV, providing the first systematic exploration of strangeness production spanning the lowest to the highest LHC energies within a unified experimental framework. The measured (multi-)strange-to-non-strange particle yield ratios, extending to multiplicities comparable to those observed in peripheral Pb–Pb collisions, offer stringent new constraints on particle production mechanisms and the scaling properties of strangeness enhancement in small systems. These measurements represent a significant step toward disentangling the roles of collision energy, multiplicity, and system size in the emergence of collective-like phenomena in high-energy hadronic interactions.

        Speaker: Prof. Anju Bhasin (University of Liverpool)
        Poster-LHCP-AnjuBhasin-version2.pdf
      • 104
        13. Light-by-light scattering at low invariant masses in UPC Pb+Pb collisions at the LHC

        Light-by-light scattering is a pure quantum electrodynamic process that proceeds via virtual charged-particle loops, where two photons interact with each other producing another pair of photons. The process was measured for the first time directly in ultra-peripheral Pb+Pb collisions at the LHC by the ATLAS and CMS experiments using Run 2 data. Since then, heavy-ion experiments at the LHC have collected new data during Run 3 at a centre-of-mass energy of 5.36 TeV per nucleon pair. This work focuses on studies of light-by-light scattering under Run 3 ATLAS conditions in an extended kinematic region defined by photon transverse momentum > 2 GeV and diphoton invariant mass > 4 GeV. In the low diphoton invariant mass region below 5 GeV, additional processes may appear and constitute potentially significant backgrounds. A first detailed assessment of this regime can be performed using dedicated MC generators such as SuperChic and UPCgen. In addition, owing to its detector capabilities, the ALICE experiment provides access to even lower invariant masses, offering sensitivity to the light-by-light scattering process in a previously unexplored regime, potentially relevant for future precision studies and searches for beyond-the-Standard-Model effects during LHC Run 4. In this contribution, we will focus on prospects for measurements of light-by-light scattering in the low-mass region within the ALICE phase space and discuss complementary studies in relation to the phase space accessible to ATLAS, using MC-based investigations of all relevant production topologies.

        Speaker: Kacper Zajac (AGH University of Krakow)
        Kacper_Zajac_LHCP_2026_Poster.pdf
      • 105
        14. Upgrade of ATLAS Hadronic Tile Calorimeter for the High Luminosity LHC

        he Tile Calorimeter (TileCal) is a sampling hadronic calorimeter covering the central region of the ATLAS experiment, using steel absorbers and plastic scintillators as the active medium. The High-Luminosity phase of the Large Hadron Collider (HL-LHC), expected to start operation around 2030, will deliver five times the nominal instantaneous luminosity of the LHC. To meet the resulting challenges—including a 1 MHz trigger rate, increased radiation levels, and high pile-up conditions—TileCal requires a complete upgrade of its readout electronics. During the long shutdown of 2026–2030, both the on-detector and off-detector TileCal electronics will be fully replaced. PMT signals from every TileCal cell will be digitized and sent directly to the back-end electronics, where the signals are reconstructed, stored, and sent to the first level of trigger at a rate of 40 MHz. This will provide better precision of the calorimeter signals used by the trigger system and will allow the development of more complex trigger algorithms. The new modular front-end electronics are based on radiation-tolerant commercial off-the-shelf components and incorporate redundant design features to minimize single points of failure. Timing, control, and data communication with the off-detector electronics are implemented using modern Field-Programmable Gate Arrays and high-speed optical links operating at up to 9.6 Gb/s. The TileCal upgrade program includes extensive R&D and test-beam campaigns. A Demonstrator module, designed with backward compatibility to the current system, was installed in ATLAS in July 2019 to validate the new architecture under real detector conditions. The status of the ongoing developments for both on- and off-detector systems, together with the expected performance and results from test-beam studies of the electronics prototypes, will be presented.

        Speaker: Pavle Tsotskolauri (Ivane Javakhishvili Tbilisi State University (GE))
        LHCP 2026 - Poster.pdf
      • 106
        16. Jet-like dihadron correlations in pO, OO, and Ne–Ne collisions with ALICE

        Heavy-ion collisions are primarily studied to investigate the properties of hot and dense primordial nuclear matter, known as the quark–gluon plasma (QGP). However, recent observations of hydrodynamic flow–like behavior in pp and p–Pb collisions at the LHC suggest the possible formation of QGP droplets even in small collision systems. To bridge the multiplicity gap between small and large systems and to examine the applicability of hydrodynamic descriptions, light-ion collisions have been studied for the first time at the LHC.

        This work presents dihadron correlation measurements in pO, OO, and Ne–Ne collisions by ALICE to explore possible medium effects. The width of the near-side correlation peak is studied as a function of collision centrality and charged-particle multiplicity measured at midrapidity. At low transverse momentum (pT), a broadening of the near-side peak is observed in OO and Ne–Ne collisions relative to pp and pO collisions, approaching what is observed in Pb–Pb collisions for central events. At higher pT, a modest narrowing of the near-side peak is observed with increasing multiplicity. Further, the per-trigger normalized relative yields of near-side and away-side correlations, IAA, are measured in OO and Ne–Ne collisions for the first time.

        The observed modification of the near-side correlation peak and the relative yields with system size may reflect the interplay between medium-induced effects and other contributions in these collision systems. The results are compared with predictions from several model calculations, including PYTHIA, AMPT, and JETSCAPE.

        Speaker: Dr Suraj Prasad (HUN-REN Wigner Research Centre for Physics (HU))
        LHCP2026Poster_DihadronCorrelation_pO9_62TeV-v3.pdf
      • 107
        17. Measurement of the J/$\psi$ Fragmentation Function in pp Collisions at $\sqrt{s} = 13.6$ TeV with ALICE

        This study identifies jets containing a J/$\psi$ meson among their constituents and defines the fragmentation function as the longitudinal momentum fraction of the jet carried by the J/$\psi$. Measuring this observable provides insights into quarkonium production mechanisms, parton-shower dynamics, and their interplay. The substantial upgrades of the ALICE detector in Run 3, most notably the implementation of a continuous readout mode, provide a major increase of statistics for J/$\psi$ analyses at midrapidity. This enhancement reduces uncertainties and enables measurements of the fragmentation function with improved granularity and an extended kinematic range, thereby providing valuable input for theoretical advancements. The fragmentation function, obtained from proton-proton (pp) collisions, is presented separately for prompt and non-prompt J/$\psi$ mesons decaying into electron-positron pairs. Jets are reconstructed using the anti-$k_{\mathrm{T}}$ algorithm over a wide range of jet transverse momentum. The findings will be compared to predictions by PYTHIA, as well as other state-of-the-art theoretical models. In addition, the results establish a baseline for interpreting future studies in heavy-ion collisions, where phenomena such as J/$\psi$ suppression and charm-quark recombination can be further investigated.

        Speaker: Lucas Ferrandi (University of Münster & University of São Paulo)
        LHCP26_Poster_v4.pdf
      • 108
        18. Event-by-event mean pT fluctuations in Pb–Pb collisions at LHC Run 3 with ALICE

        Event-by-event mean transverse momentum fluctuations of relativistic charged particles produced in Pb--Pb collisions at $\sqrt s_{NN} = $ 5.36 TeV are studied in terms of normalized two-particle correlator $\sqrt{C_{m}}/\langle \langle p_{T} \rangle \rangle$. Data collected using the ALICE detector during Run 3 are analyzed for this purpose and the results are compared with those reported earlier for large collision systems. The findings reveal the presence of dynamical fluctuations. It is also observed that the correlation strength decreases monotonically with increasing charged-particle density. The observed trend of $\sqrt{C_{m}}/\langle \langle p_{T} \rangle \rangle$ with $\langle dN_{ch}/d\eta \rangle$ is found to be in qualitative agreement with the previous measurements in Pb--Pb collisions at $\sqrt{s_{NN}} = $ 2.76 and 5.02 TeV. The multiplicity dependence of the correlator is compared with predictions from PYTHIA Angantyr and EPOS4. In contrast, both the Pb–Pb data and the EPOS4 predictions show significant deviations from a simple power-law scaling, indicating the presence of collective effects. Cumulative values of $\sqrt{C_{m}}/\langle \langle p_{T} \rangle \rangle$ for the 0-5 % central collisions are also obtained and compared with those reported for Pb--Pb, Au--Au and Pb--Au collisions by the ALICE, STAR, and CERES Collaborations.

        Speaker: Sweta Singh (Aligarh Muslim University (IN))
        sweta_EbyE_MeanpT_Fluctuations.pdf
      • 109
        19. Event-by-event net-charge fluctuations in pp, OO, Ne--Ne, and Pb--Pb collisions with ALICE at the LHC

        Investigations involving the event-by-event fluctuations of conserved quantities, like net charge, net baryon number, and strangeness in heavy-ion collisions, provide insights into the properties of QGP and the phase diagram of strongly interacting matter. Event-by-event fluctuations of net electric charge in pp collisions at $\sqrt{s} = 13$ and $13.6$ TeV and for OO, Ne--Ne, and Pb--Pb collisions at $\sqrt{s_{\text{NN}}} = 5.36$ TeV are studied by analysing the data collected by the ALICE detector at CERN Large Hadron Collider.

        The analysis is carried out in terms of the variable $\nu_{\text{dyn}}[+,-]$, chosen for its robustness against the detector efficiency losses. The observed dependence of $\nu_{\text{dyn}}[+,-]$ on the charged-particle density exhibits an energy-independent smooth increase of net-charge fluctuations from smaller to larger collision systems. \

        The negative values of $\nu_{\text{dyn}}[+,-]$ indicate a dominance of correlations between oppositely charged particle pairs compared with those arising from like-sign charge pairs. Since $\nu_{\text{dyn}}[+,-]$ is known to have an intrinsic dependence on multiplicity, an appropriate scaling is applied. The variable is therefore scaled with the mean multiplicities,$\frac{1}{\frac{1}{\langle N_+ \rangle} + \frac{1}{\langle N_- \rangle}}$. The dependence of the scaled values of $\nu_{\text{dyn}}[+,-]$ on charged particle density is also looked into. The results are compared with model calculations from PYTHIA, EPOS4, AMPT and HIJING.

        Speaker: Nida Malik (Aligarh Muslim University (IN))
        LHCP_poster_netcharge_flucutations.pdf
      • 110
        21. Probing Chiral Symmetry Restoration via Parity-Partner Resonances $\rm K^{*}(892)^{0}$ and K$_{1}(1270)$ with ALICE at the LHC

        In relativistic heavy-ion collisions at the LHC, extreme conditions are created where the temperature exceeds the QCD phase transition threshold ($T_{\mathrm{ch}} \sim 156$ MeV), leading to the formation of the quark--gluon plasma (QGP). In this phase, lattice QCD predicts a partial restoration of chiral symmetry, which can be investigated through parity-partner resonances with identical quantum numbers except for parity, such as the K$^{*}(892)^{0}$ and K$_{1}(1270)$. In vacuum, these particles exhibit different masses, widths, and production yields. However, near chiral symmetry restoration, these differences are expected to diminish, potentially leading to mass degeneracy and an enhanced K$_{1}$/K$^{*}$ yield ratio beyond statistical hadronization model predictions.

        Equipped with high-precision tracking and particle identification, the ALICE detector is particularly well suited for these measurements. Using the large data sample from LHC Run 3, this contribution presents the first results on K$^{*}(892)^{0}$ production in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.36$ TeV. Furthermore, plans for studying the K$_{1}(1270)$ resonance with ALICE as a probe of chiral symmetry restoration in the early stages of the collision will be discussed. The measurement will be performed via its dominant decay channel, K$_{1}(1270) \to \mathrm{K}^{*}(892)^{0} \pi$, with the K$^{*}$ reconstructed through K$\pi$ pairs.

        Speaker: Sonali Padhan (Universita di Brescia (IT))
        LHCP_2026_SonaliPadhan_v2.pdf
      • 111
        22. Making gold from lead: emission of protons in ultraperipheral Pb–Pb collisions at the LHC

        The first experimental results from the ALICE Collaboration on the emission of forward protons accompanied by neutrons in ultraperipheral $^{208}$Pb–$^{208}$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV are presented. While electromagnetic dissociation (EMD) events with low neutron multiplicities are predominant at the LHC energies, the cross sections for the emission of one, two, and three protons are comparable to or exceed the total hadronic cross section. These cross sections were measured using the ALICE Zero Degree Calorimeters (ZDCs). According to the Relativistic ELectromagnetic DISsociation (RELDIS) model, these proton emission cross sections serve as upper limits for the production of the respective secondary nuclei, Tl, Hg, and Au, in the EMD of $^{208}$Pb. The cross sections of the emission of a single proton along with one, two, or three neutrons were also measured, which correspond to the production of specific thallium isotopes,$^{206,205,204}$Tl. These results provide novel information for tuning and validating various EMD models. Ultimately, a comprehensive understanding of the production of secondary nuclei delivers crucial insights into beam intensity decay and beam losses at the LHC and future ion colliders.

        Speaker: Dr Uliana Dmitrieva (Universita e INFN Torino (IT))
        Dmitrieva_Proton_emission_LHCP2026_poster_final.pdf
      • 112
        23. Search for charginos and neutralinos with B-L R-parity violating decays in sqrt(s)=13 TeV and 13.6 TeV pp collisions with the ATLAS detector

        A search is performed for the electroweak pair production of charginos and associated production of a chargino and neutralino, each of which decays through an R-parity-violating coupling into a lepton and a W, Z, or Higgs boson. This search targets the Higgs boson decay channel, using events with three or more b-tagged jets and one or two electons or muons. The analyzed dataset corresponds to an integrated luminosity of 140 fb-1 and 56 fb-1 of proton–proton collision data produced by the Large Hadron Collider at center-of-mass energies of sqrt(s)=13 TeV and 13.6 TeV respectively, collected by the ATLAS experiment between 2015 and 2023. The data are found to be consistent with predictions from the Standard Model. The results are interpreted as limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model. Limits are also set on the production of charginos and neutralinos for a Minimal Supersymmetric Standard Model with an additional B-L symmetry which is spontaneously broken. Simultaneous exclusion limits on chargino and neutralino masses and their decay branching ratio to Higgs bosons are made.

        Speaker: Bobby McGovern (University of Victoria (CA))
        HMBS-2024-09
      • 113
        24. ARTEMIS: exploring anomaly detection in the ATLAS Level-1 Trigger

        The ATLAS Level-1 trigger is a hardware-based system that selects meaningful events from the LHC, reducing the initial event rate of 40 MHz down to 100 kHz. Traditionally, Level-1 Trigger algorithms have been designed to target a set of predefined, interesting Physics signatures. However, in recent years, anomaly detection (AD) triggers have also been explored, aiming to increase the sensitivity to rare or unforeseen phenomena. ARTEMIS is the latest AD trigger implemented in the ATLAS Level-1 Topo subsystem, and it will be enabled during the 2026 data-taking period. This project explores possible modifications to the existing AD triggers at Level-1. Starting from a similar framework, a different architecture and loss function are investigated, with the goal of enhancing potential signal events that do not pass the existing Level-1 triggers. This poster discusses the development of ARTEMIS, as well as the various challenges faced during its design.

        Speaker: Paula Martinez Suarez (CERN)
        PMS_FDF_2026.pdf
      • 114
        25. Search for dijet resonances using Trigger-Level Analysis with the ATLAS detector

        Trigger bandwidth limitations constrain physics analyses that target low-mass resonances, where high-rate data collection is essential. To circumvent this limitation Trigger-Level Analysis (TLA) can be applied. A recent publication by the ATLAS experiment demonstrated this approach during LHC Run 2 by processing a massive dataset of over 60 billion events, more than twice the number of fully reconstructed ATLAS events from Runs 1 and 2 combined. In the TLA workflow only fragments of complete collision events are stored, consisting of high-level objects (e.g. jets and photons) and limited additional information needed for calibration. This leads to a significant reduction in the event size and permits data acquisition at more than 20-fold rate compared to the standard approach. The TLA technique has been applied during Run 2 of the LHC to search for electroweak scale dijet resonances, extending the coverage of dark matter models to difficult to access phase space. This contribution reports the results of the Run 2 dijet TLA search . The operational performance of TLA trigger chains is emphasised along with an overview of the analysis strategies and computational constraints.

        Speaker: Sukanya Sinha (The University of Manchester (GB))
        SSinha_LHCP2026poster.pdf
      • 115
        26. Upgrade of the ATLAS detector Trigger system for the High-Luminosity phase of the Large Hadron Collider

        The High-Luminosity LHC is the Large Hadron Collider long term program targeting to operate the accelerating machine at the instantaneous luminosity of 7.5 x 10^34 cm^-2 s^-1, corresponding to approximately 200 pp interactions per bunch-crossing. The ATLAS Trigger System will be upgraded to cope with such a high rate of incoming particles. The ATLAS collaboration has endorsed a upgraded trigger architecture design based on a single Level-0 hardware trigger using calorimeter and muon spectrometer information with an output readout rate of 1 MHz and a maximum latency of 10 μs, followed by an Event Filter software system, delivering an output rate of 10 kHz to the permanent storage. The status of the design and test of the upgraded system will be presented, with a focus on the upgrade of the Muon Trigger subsystem.

        Speaker: Giovanni Padovano (Sapienza Universita e INFN, Roma I (IT))
        ATL-COM-DAQ-2026-053.pdf
      • 116
        27. Run-3 Performance of the ATLAS Muon Spectrometer and Upgrades for the High-Luminosity LHC

        Precise and efficient muon detection is essential for a wide range of physics analyses at the LHC. The excellent performance of the ATLAS Muon Spectrometer (MS) during Run-1 and Run-2 enabled many key physics results, including electroweak measurements, Higgs boson studies, and searches for physics beyond the Standard Model. With the start of Run-3, the ATLAS muon system has been significantly enhanced by the installation of the New Small Wheel (NSW), which replaced the innermost endcap stations and has been fully operational since 2022. The ATLAS Muon Spectrometer, the largest muon detection system ever built for high-energy physics, now combines long-standing gaseous detectors—Monitored Drift Tubes (MDT), Thin Gap Chambers (TGC), and Resistive Plate Chambers (RPC)—with newer technologies such as Micromegas and small-strip TGCs installed in the NSW. Using Run-3 data, the performance of the muon detectors and reconstruction algorithms is evaluated, with particular emphasis on the NSW system. Measurements of muon identification and reconstruction efficiency over a wide transverse momentum range are presented, together with studies of the muon trigger performance, which is particularly important for analyses involving low-momentum muons, such as those from J/ψ, B-meson, and W/Z decays. Looking ahead to the High-Luminosity LHC (HL-LHC), the ATLAS Muon Spectrometer will undergo a major upgrade during the Long Shutdown 3 (LS3), starting in 2026. The front-end and readout electronics of the MDT, RPC, and TGC systems will be replaced to accommodate the higher trigger rates and extended latencies of the new level-0 trigger. Additional detector improvements are also foreseen, including new RPC chambers with 1 mm gas gaps in the inner barrel, the integration of MDT chambers in the level-0 trigger, the installation of small-diameter MDTs in high-occupancy regions, and the replacement of TGC doublets with triplet chambers in the barrel–endcap transition region. This contribution presents both the current performance of the ATLAS Muon Spectrometer with Run-3 data and an overview of the HL-LHC upgrade program and its expected impact on trigger and reconstruction performance.

        Speakers: Somanko Saha, Somanko Saha (Université Paris-Saclay (FR))
        ATL-COM-MUON-2026-014-V5.pdf
      • 117
        28. AI-Native Pedagogical Engine for Quantum-Ready HL-LHC Workforce Development Infrastructure Using CERN Open Data

        The High-Luminosity Large Hadron Collider (HL-LHC) faces a two-pronged challenge: first, data management and analysis has become more complex and needs to be prioritized. For this purpose, the ever-evolving nature of AI warrants a shift from conventional apprenticeship-based training methods to more scalable workforce development infrastructure. At the same time, quantum-based methods, which are rapidly advancing, have increasingly started to intersect with classical machine learning workflows. This requires researchers to acquire a wider range of skillset.
        To address this problem, we demonstrate an AI-native pedagogical engine. Leveraging large language models (LLMs), students use hands-on learning based on CERN Open Data, such as the ATLAS (2012, 8 TeV) and CMS datasets (CERN Open Data Portal, 2024). Furthermore, learners interact with a system that integrates a RAG framework grounded in the CERN Document Server (Lewis et al., 2020). The unique feature of the server is that it has a sandboxed execution environment (SWAN/ROOT). Not only this setup allows iterative code generation, execution, and validation on real collision data, but it preserves physics consistency.
        The range of learning tasks varies from understanding detector-level data to performing classification, which includes applications to Higgs boson decay channels (H → γγ). Modules based on advanced topics underscore the applications of graph neural networks (GNNs). Lastly, learners explore hybrid approaches and leverage variational quantum classifiers (VQC) and quantum support vector machines (QSVM) on LHC datasets (Biamonte et al., 2017).
        Our pilot, conducted through a hackathon with early researchers, indicates that there was an improvement in the understanding of concepts. Furthermore, the learners showed a better grasp of code correction and achieved better efficiency in completing their task using an AI-based curriculum and learning system. Based on our findings, this work underscores the effectiveness of AI-based training as an engine to enable scalable HL-LHC readiness and quantum-savvy workforce development.

        Speaker: Waqas Halim
        CERN_Poster_A0_Portrait.pdf
      • 118
        29. Charged-particle multiplicity distributions in p-O collisions: a comparative study of initial-state geometry and particle production approaches.

        The recent injection of oxygen beams into Run 3 of the Large Hadron Collider (LHC) opens the way for the study of particle production in an unexplored energy regime. Particularly, a proton-oxygem (p-O) collision provides a favorable environment for investigating the asymmetric production of higher-density particles. This asymmetry can increase the sensitivity to the internal structure of the nucleus involved in the interaction, and models that separate purely geometric effects from initial states are essential to understanding how the nucleus geometry organization impacts the final state produced. We studied the multiplicity of charged particles produced in p-O collisions using Pythia (Angantyr) and $k_T$-factorization. Oxygen nucleus configurations were sampled using the $\alpha$-cluster model to avaluate both frameworks. These results were systematically compared to those derived from the Woods-Saxon nuclear distribution at different ranges of pseudorapidity and center-of-mass energies. Our results indicate that the initial geometry plays a significant role in determining multiplicity of charged particles. Different geometric descriptions of the oxygen nucleus produce markedly different multiplicities, particularly at high multiplicities and higher pseudorapidity. Furthemore, we observed subtantial differences between the Pythia predictions and those of the $k_T$-factorization approach, highlighting the sensitivity of these observables to the underlying modeling framework.

        Speaker: Yuri do Nascimento Lima (Universidade de Sao Paulo (USP) (BR))
        chmultiplicity.pdf
      • 119
        30. Phenomenology study of coherent and incoherent vector meson photoproduction in ultra-peripheral ion collisions at LHCb

        In ultra-pheripheral photonuclear interactions, the colliding ions are separated by more than the sum of their radii and the reaction proceeds via photon emission from one nucleus followed by interaction with the target nucleus. A vector meson can be produced if the photon interacts with gluons in the target. Such processes are sensitive to the nuclear structure, including modifications to the nuclear parton distribution functions and the geometrical shape of the nuclei. Coherent and incoherent photoproduction (where either the whole nucleus or a single nucleon acts as a target) in fixed target mode allow us to probe the nuclear structure at low energy and high values of Bjorken-x. Additionally, we study vector meson photoproduction in light ions collisions, probing different kinematics; the higher collision energy provides sensitivity to low Bjorken-x, where saturation and shadowing effects are expected to become important. We perform a phenomenological study with the STARLIGHT Monte Carlo generator both in fixed target and collider mode at LHCb, assessing the expected experimental precision on the coherent and incoherent vector meson photoproduction cross sections. The discriminating power between the contributions is investigated, in order to learn whether such measurements will be able to differentiate between various models for nuclear structure.

        Speakers: Olga Bessidskaia Bylund, Olga Bessidskaia Bylund (Université Paris-Saclay (FR))
        Bylund_VectorMesonPoster.pdf
      • 120
        31. An insight into the rare $Z\rightarrow b \bar{b}\gamma$ at the HL-LHC

        Studies at the $Z$-pole have played an important role in developing our understanding of the Standard Model (SM). Continuing the explorations in this regime, we consider the possibility of the production of two $b$-quarks and a photon in proton-proton collisions at the HL-LHC. While such a final state is possible in the SM by means of the process $Z\rightarrow b\bar b$ decay with a radiated photon, the focus is on extracting its possible origins due to beyond Standard Model (BSM) physics. The signal topology can be broadly identified as $Z\rightarrow \Phi\gamma\rightarrow b\bar b\gamma$, where $\Phi$ can either be a Spin-0 or Spin-2 state with a mass less than that of the $Z$ boson. The analysis is characterized by two relatively low $p_T$ $b$-tagged jets in association with an isolated photon. While considering an appropriate cross-trigger for the HLT, we study the reach of this signal for different masses of $\Phi$. The eventual mass-dependent sensitivity also underscores the importance of improving soft object reconstruction that may result from light new physics states.

        Speakers: Tejaswini Thallapalli, Ms Tejaswini Thallapalli, Tejaswini Thallapally
        Tejaswini_LHCP_poster.pdf
      • 121
        32. In-medium QCD splittings beyond the soft, large-Nc and harmonic-oscillator approximations all at once

        The building block of jet quenching calculations is the differential matrix-element to radiate a gluon off a highly-energetic parton in a dense QCD medium. Analytical expressions were presented more than 30 years ago in the pioneering work of BDMPS-Z. However, exact solutions have remained elusive, thus hampering the precision of jet quenching phenomenology.

        We present the first calculation of QCD in-medium splitting kernels which accounts for arbitrary energy fractions $z$ of the emitted gluon, finite-$N_c$ corrections and a realistic medium potential, providing solutions across the entire phenomenologically relevant phase space. Building on [1], we formulate the problem as a set of tractable evolution equations and solve them using an efficient and stable numerical method based on the Faber expansion of the time-evolution propagator [2]. We analyse the applicability of the large-$N_c$ limit and demonstrate the breakdown of the commonly employed straight-line approximation. As a phenomenological application, we compute in-medium energy–energy correlators (EECs) at LHC kinematics, quantifying the impact of the complete finite-$z$
        solution and improved medium potential on jet substructure observables.

        [1] JHEP 09 (2023) 049
        [2] Comput. Phys. 216 (2006) 391-402

        Speaker: Marco Leitão (IPhT-Saclay & LIP-Lisbon)
        Poster_LHCP.pdf
      • 122
        33. Colour sextet baryons in composite Higgs models

        Composite Higgs models provide a well-motivated solution to the naturalness problem. The top quark appears as a partially composite state, generating its large mass by mixing with top partners. Besides the common vector-like quarks, also more exotic baryons can appear, including sextets of $SU(3)_c$. We present the phenomenology of such states, focusing on the expected signatures at the LHC. We show that pair production yields signatures with as much as eight top quarks, and present current mass bounds from recasts of LHC searches.

        Speaker: Manuel Kunkel
        poster-lhcp26.pdf
      • 123
        34. Leptoquarks at the LHC: From Exclusion Bounds to Novel Signatures

        Leptoquarks (LQs), colour-triplet bosons that couple quarks and leptons, arise naturally in several Beyond the Standard Model (BSM) frameworks and constitute well-motivated targets for searches at the Large Hadron Collider (LHC). This work presents a comprehensive study of LQ phenomenology through refined reinterpretations of LHC Run II data and investigations of new production channels involving heavy neutral fermions and vectorlike leptons (VLLs). We perform a consistent recast of existing searches for scalar and vector LQs, including QCD pair production, Yukawa-driven single production, t-channel exchange, and interference with Standard Model backgrounds, while incorporating photon-initiated and mixed QED–QCD processes. We also explore LQ-mediated production of right-handed neutrinos and VLLs, highlighting distinctive mono- and di-lepton signatures relevant for the High-Luminosity LHC. In addition, the study identifies several new LQ states arising from interactions with VLLs in different gauge representations and outlines their collider implications. These results strengthen current constraints on LQ parameter space and identify promising discovery channels for future collider experiments.

        Speaker: Rachit Sharma (Indian Institute of Science Education and Research Thiruvananthapuram, India)
        Poster_PMRF.pdf
      • 124
        35. Angular correlations and polarization in Z+jet production at the LHC

        Precision studies of electroweak processes at the LHC increasingly require theoretical predictions that incorporate both higher-order QCD corrections and resummation effects in the high-energy regime. In this work we present the first high-energy-resummed predictions for Drell-Yan plus jet production, providing differential spectra in rapidity and transverse momentum for $Z/\gamma^*$ bosons. Our calculation combines fixed-order NLO QCD with next-to-leading high-energy logarithmic accuracy (NLL/NLO). The framework is implemented within the JETHAD-DYnamis approach and matched to the event generator POWHEG through a new strategy that consistently incorporates polarization effects, angular correlations, and realistic lepton-level kinematics. To our knowledge, this represents the first implementation of high-energy resummation for rapidity-separated Z-boson final states. The resulting predictions improve the theoretical description of key observables relevant to current LHC measurements and to the High-Luminosity LHC program, where percent-level control of Drell-Yan distributions is essential.

        Speaker: Dr Francesco Giovanni Celiberto (UAH Madrid)
        LHCp_2026_Z-jet_QCD_Celiberto.pdf
      • 125
        36. MUFFIN: A machine-learning method for the estimation of the background from jets misidentified as hadronic tau lepton decays

        Backgrounds from quark- and gluon-initiated jets misidentified as hadronically decaying tau leptons ($\tau_\mathrm{h}$) are a major challenge in analyses involving tau leptons at CMS. Traditional methods estimate this contribution using low-dimensional parametrisations that can struggle to model complex regions of phase space. We present MUFFIN (MUltivariate Fake-Factor INference), a machine-learning-based, data-driven method for estimating the $\mathrm{jet}\rightarrow\tau_\mathrm{h}$ background. The approach uses boosted decision tree reweighting to learn multidimensional transfer factors directly from data, enabling the misidentification probability to be modelled across the full phase space. The method is validated using proton-proton collision data collected by the CMS experiment at $\sqrt{s}=13.6~\mathrm{TeV}$ in both fully-hadronic ($\tau_\mathrm{h}\tau_\mathrm{h}$) and semi-leptonic ($\tau_\ell\tau_\mathrm{h}$) final states. Compared to the traditional method, MUFFIN improves the modelling of key kinematic observables and reduces the associated systematic uncertainty on the $\mathrm{jet}\rightarrow\tau_\mathrm{h}$ background by up to 50%.

        Speaker: Irene Andreou (Imperial College (GB))
        MUFFIN_Poster_LHCP_IreneAndreou.pdf
      • 126
        37. Fragmentation-function predictability from first principles with a quantum computer

        We deploy Quantum Chromodynamics (QCD) in Light-front Quantization (and Gauge), discretized and truncated in both Fock -- and momentum -- spaces with a particle-register encoding suited for quantum simulation; we show for the first time how to calculate fragmentation functions, a problem heretofore untractable in general from \emph{ab-initio} approaches. We provide a classical-simulator based proof-of-concept by computing the charm-to-charmonium fragmentation, c→J/ψ, in a simplified setup, an interesting case where we can (reasonably) compare with the known 1993 perturbative evaluation within Nonrelativistic QCD.

        Speaker: Felipe J. Llanes-Estrada
        Fragmentation_from_QuantumComputer.pdf
      • 127
        38. Observation of the decay $B^0_{s}\to K^0 p \bar{p}$ and measurement of the $B^0_{(s)} \to K^0 p \bar{p}$ branching fractions

        A study of the charmless baryonic decays $B^0_{(s)} \to K^0 p \bar{p}$ is presented, where $B^0_{(s)}$ denotes either a $B^0$ or a $B^0_s$ meson. The analysis is based on proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and $13~\mathrm{Tev}$, corresponding to an integrated luminosity of $9~\mathrm{fb}^{-1}$. The decay $B^0_s \to K^0 p \bar{p}$ is observed for the first time, with a measured branching fraction of $(9.14 \pm 1.69 \pm 0.90 \pm 0.33 \pm 0.20) \times 10^{-7}$ and a significance of $5.6\sigma$. The uncertainties respectively account for statistical and systematic contributions, the precision of the branching fraction of the normalisation channel $B^0 \to K^0 \pi^{+} \pi^{-}$ and the fragmentation fraction ratio ${f_s}/{f_d}$. The branching fraction determined for $B^0 \to K^0 p \bar{p}$ is $(2.82 \pm 0.08 \pm 0.12 \pm 0.10) \times 10^{-6}$, which is the most precise measurement to date.

        Speaker: Dr Duanqing Liu (Central China Normal University CCNU (CN))
        BdsKSppbar_Poster.pdf
      • 128
        39. Integration of CODEX-β into the LHCb Trigger: Data Flow and Online Processing

        The COmpact DEtector for EXotics at LHCb (CODEX-b) is a particle physics detector dedicated to displaced decays of exotic long-lived particles (LLPs), compelling signatures of dark sectors Beyond the Standard Model, which arise in theories containing a hierarchy of scales and small parameters. The CODEX-b detector is a cube of high-performance RPC triplet chambers with 10 m per side, with two internal sections, planned to be installed near the LHCb interaction point. Its design provides a way to integrate with the LHCb readout, allowing candidate LLP events in CODEX-b to be tagged with corresponding LHCb detector information. A demonstrator detector, CODEX-β, has been installed to take data in 2026.

        The contribution presents the integration of the CODEX-β demonstrator into the LHCb High-Level Trigger system. CODEX-β data are acquired from RPC-based triplet modules and transmitted through a dedicated data acquisition chain into the LHCb DAQ, where they are injected as an additional raw data bank into HLT1 processing. A dedicated software chain processes the incoming data through the full trigger sequence, including HLT1 and HLT2, enabling the reconstruction of detector activity and the definition of trigger selections for commissioning and physics event selection. Following online processing, the data are stored in separate streams for LHCb and CODEX-b, allowing independent access and analysis by the CODEX-b collaboration. This work demonstrates that external detector information can be fully integrated into the real-time LHCb trigger, establishing a scalable pathway for incorporating CODEX-β, and future CODEX-b, data into the experiment’s online selection and analysis framework.

        Speaker: Valerii Kholoimov (EPFL - Ecole Polytechnique Federale Lausanne (CH))
        CODEX_poster.pdf
      • 129
        40. Charmonia production with SMOG2 at LHCb

        Charmonium mesons are among the most important probes of deconfined QCD matter. A complete understanding of their production and interaction with the medium created in the collision is necessary to disentangle genuine hot-matter effects from cold nuclear matter effects. To achieve this, charmonium production must be measured in different collision systems over a wide energy range. Fixed-target collisions at LHCb, enabled by the SMOG2 system, complement studies performed in collider mode and provide access to kinematic regions not explored by other fixed-target experiments. In Run 2, the LHCb collaboration provided results on $J/\psi$-to-$D_0$ and $\psi(2S)$ -to-$J/ \psi$ ratios in $p$ Ne and PbNe collisions at $\sqrt{s_NN} = 68.5$ GeV. In Run 3 the SMOG2 system has so far enabled an expanded set of targets, including He, Ne, Ar, $\mathrm{O}_2$, $\mathrm{D}_2$ and $\mathrm{H}_2$, the latter serving as a proxy for $pp$ collisions at $\sqrt{s_{NN}} = 113$ GeV. Here we present the first LHCb fixed-target heavy-flavor results from Run 3, with a focus on charmonia, and discuss the prospects for upcoming analyses aimed at improving the precision of and extending the Run 2 results. In addition, we present the first results on the determination of centrality classes in lead-target datasets from Run 3, as this variable is crucial for most heavy-ion physics analyses. Taken together, these results highlight the unique opportunities offered by the LHCb fixed-target programme for studying quarkonium production and nuclear matter effects, and advancing our understanding of QCD matter under extreme conditions.

        Speaker: Aleksandra Petkovic (Laboratoire Leprince-Ringuet, Ecole Polytechnique)
        LHCP_Charmonia_Aleksandra_v3.pdf
      • 130
        41. Status and prospects for Vub measurements at LHCb

        Precise determinations of the CKM matrix element ∣Vub∣ are essential for testing the consistency of the Standard Model and for probing possible sources of flavour-changing new physics. LHCb offers a unique environment to study ∣Vub​∣ using semileptonic decays of various species of beauty hadrons, exploiting excellent vertexing, particle identification, and kinematic reconstruction. This contribution summarises the current status of ∣Vub∣ measurements at LHCb and discusses prospects for improved precision with larger data sets, refined analysis techniques, and improved theoretical inputs.

        Speaker: Alois Caillet (Centre National de la Recherche Scientifique (FR))
        Poster_Vub_Prospects.pdf
      • 131
        42. Improved branching-fraction measurements of $B^0_{(s)} \to K_S^0 h^+ h^{'-}$ decays and first observation of $B^0_s \to K_S^0 K^+ K^-$

        We present a study of the charmless three-body decays $B^0_{(s)} \to K_S^0 h^+ h^{'-}$, where $h$ is either a $\pi$ or a $K$, corresponding to 6 final states whose branching fractions are measured simultaneously. These decays are suppressed and, in certain cases, are dominated by penguin topologies. The data sample collected at LHCb between 2011 and 2018 is used for these measurements, corresponding to an integrated luminosity of $9 \, \text{fb}^{-1}$. In a previous paper, using just Run1 data, no conclusive evidence was found for the existence of $B_{s}^{0} \to K_{S} K^{+} K^{-}$. With this larger dataset, $B_{s}^{0} \to K_{S} K^{+} K^{-}$ is observed for the first time with a statistical significance corresponding to 8.6 standard deviations. The poster will present the essential steps of the analysis. First, the selection procedure is outlined: a trigger, a cut-based preselection, and two boosted decision trees based on particle identification and on topological variables. Second, the fit strategy is described: separate fit components are included for the $B^{0}$ and $B^{0}_{s}$ signal peaks, partially reconstructed signal decays, crossfeed structures due to hadron misidentification, and combinatorial background. Third, the efficiency correction procedure is presented. This includes a description of the variation of efficiency across the Dalitz plane, uses a data-driven estimate of the signal distribution in the Dalitz plane to obtain the weighted-average efficiency. Finally, the new branching fractions results are presented. Compared to the previous LHCb measurement, the uncertainties on the ratios of branching fractions are reduced by a factor of 2 to 3, due both to the larger data sample and to improvements in the analysis procedure. The tools developed for this branching fraction analysis are being reused in ongoing amplitude analyses of $B^0_{(s)} \to K_S^0 h^+ h^{'-}$ decays.

        Speaker: Edoardo Mariani (Centre National de la Recherche Scientifique (FR), LPNHE, Sorbonne Université)
        Poster_LHCP_18_05_2026_EMariani_v2.pdf
      • 132
        43. The anatomy of an electron shower in the High Granularity Calorimeter

        The High Luminosity LHC (HL-LHC) will introduce unprecedented levels of pileup, posing major challenges for particle reconstruction in dense environments. To maintain excellent physics performance, the CMS experiment will install the High Granularity Calorimeter (HGCAL), a novel endcap calorimeter system providing fine three-dimensional spatial resolution and precision timing for energy deposits. This high level of detail enables a fundamentally new approach to event reconstruction, centered on the identification and clustering of energy deposits into coherent particle showers, thanks to the 6 million readout channels provided.

        This poster focuses on the reconstruction of electron-induced electromagnetic showers through advanced clustering techniques within the HGCAL. We highlight how the high granularity of the detector allows for the detailed imaging of shower development, and how this information is exploited by the Iterative CLustering (TICL) framework to group individual hits into physically meaningful structures. Particular emphasis is placed on the challenges of clustering in high-occupancy environments, where overlapping showers and complex topologies require robust pattern recognition strategies, while keeping the computing requirements to a manageable level thanks to parallelizable algorithms.

        Through innovative event displays, this poster provides insight into the anatomy of electromagnetic showers in HGCAL and demonstrates how advanced clustering and pattern recognition techniques enable precise reconstruction of electromagnetic signatures in the challenging conditions of the HL-LHC.

        Speaker: Theo Cuisset (LLR / École Polytechnique (FR))
        Poster_TheoCuisset_HGCALElectron_LHCP26_.pdf
      • 133
        44. Search for a Right-Handed W Boson and Heavy Neutrino in the Tau_h Tau_l + Jets Final State with CMS

        This poster presents a search for a right-handed W boson (W_R) and a heavy neutrino (N) in the Left-Right Symmetric Model, using the full CMS Run 2 dataset at 13 TeV. The analysis targets the final state with a hadronic tau, a leptonic tau, and jets from the decay chain W_R to tau N, N to tau_l jj.

        A novel strategy is employed to enhance sensitivity in both resolved and boosted regimes. For the boosted topology where m_W_R is much larger than m_N, the lepton is identified inside a large-radius jet using the Lepton Subjet Fraction (LSF_3) algorithm. Two signal regions are defined to probe the m_W_R versus m_N mass plane, and a data-driven fake factor method is used to estimate the dominant background from jets misidentified as taus. The results set new exclusion limits on the W_R and N masses, significantly extending the reach of previous searches.

        Speaker: Youngwan Kim (Seoul National University (KR))
        Poster_YoungwanKim_LHCP2026.pdf
      • 134
        45. Probing Multifractality in Heavy-Ion Collisions at FAIR Energies using UrQMD

        One of the primary objectives of the Compressed Baryonic Matter (CBM) experiment at Facility for Antiproton and Ion Research (FAIR) is to explore the nature of QCD-phase transition at relatively high baryon density and moderate temperature, in contrast to the heavy-ion collisions at RHIC and LHC energies. In this exploration, the multifractal analysis approach can play an important role in understanding the properties of dense QCD matter produced in heavy-ion collisions at CBM-FAIR energies. We perform a multifractal study using UrQMD (hadronic transport for non-critical baseline) Monte Carlo event generator for Au-Au collisions at FAIR energies (10A, 20A, 30A, and 40A GeV) in two-dimensional (η − φ) phase space by varying the size of the bins. The generalized dimension Dq for different orders q at different centralities and beam energies has been calculated using the methodology proposed by Takagi. The analysis suggests the multifractal behaviour of charged particle spectra at the considered FAIR energies. The linear dependence of the Dq values as a function of ln(q)/(q-1) favours the multifractal Bernoulli representation, and the values of multifractal specific heat, ‘c’, have been extracted from the Dq values. Further, we perform a comparative analysis of the results with the available experimental data and other model results. A slowly decreasing trend of the ‘c’ values with increasing beam energy is observed for nuclear collisions at the considered FAIR energies. Furthermore, the value of the critical exponent ‘ν’ is estimated and compared with those available for other experimental measurements. The ‘ν’ values calculated seem to acquire nearly a constant value, less than the value predicted by Ginzburg-Landau theory. The ‘ν’ values, however, show a good agreement with the one predicted by the 2D Ising model.
        The findings are also compared with the results based on similar studies at RHIC and LHC [1].

        References:
        [1] Anuj Chandra, Ashwini Kumar, Sweta Singh, Shakeel Ahmad, and B.K. Singh, “Multifractal analysis of heavy-ion collisions at RHIC and LHC energies”,
        Physics Letters B 871 (2025) 140027.

        Speaker: Dr Anuj Chandra (Aligarh Muslim University (IN))
        LHCP2026_Poster.pdf
      • 135
        47. Search for Pair-Produced Vector-Like Quarks in the All-Hadronic Final State using the Boosted Event Shape Tagger with Full Run 2 CMS Data

        We present a search for vector-like quarks (VLQ) which decay to third-generation quarks and vector bosons in all hadronic final states. This doublet model search analyzes data from 138 fb^(−1) integrated luminosity at 13 TeV center of mass energy proton-proton collisions collected by the CMS detector. Highly Boosted jets are classified as W, Z, Higgs, top, bottom, and QCD by training a neural network from 262 high level observables that describe the jet substructure and event topology. Events are categorized based upon the leading signal region jets, resulting in 126 possible orthogonal 4-jet signal regions. We estimate the mistagging rates of our jet multi-classifier using an orthogonal QCD-rich control region. We place limits on the existence of VLQs in our data through a fit to HT, the total transverse energy of the event, across all signal regions is performed simultaneously using the Higgs Combine toolbox.

        Speaker: Caleb Walker Fairchild (University of California Davis (US))
        LHCP Poster - Caleb Fairchild.pdf
      • 136
        48. Search for heavy top quark partners with electric charge 5/3 in the single-lepton final state

        A search for the pair production of a vector-like quark with electric charge 5/3 (X_{5/3}), a heavy fermionic partner of the top quark, is presented. The search is performed in the single-lepton final state using proton–proton collision data collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV during the 2016–2018 period, corresponding to an integrated luminosity of 138 fb^-1. A boosted decision tree is employed to enhance the separation between signal and background, yielding the most sensitive results in this final state. In the benchmark scenario, the X_{5/3} is assumed to decay exclusively to a top quark and a W boson. No significant excess above the standard model expectation is observed, and expected (observed) upper limits are set at 95% confidence level on the X_{5/3} pair production cross section, excluding X_{5/3} masses up to 1610 (1681) GeV. Motivated by the 331 model, an exotic decay mode in which the X_{5/3} decays to a top quark and a charged Higgs boson is also probed. These results represent the first search for this BSM decay channel, excluding X_{5/3} masses up to 1715 (1723) GeV depending on the charged Higgs boson mass.

        Speaker: Farrah Simpson (Princeton University)
        FarrahSimpson-LHCP-Poster-Session-FINAL_v2.pdf
      • 137
        49. Measurements of nuclear suppression in light ion collisions with system-size comparison in CMS

        Previous measurements of heavy ion collisions exhibit a suppression of high-transverse-momentum particle yield, often associated with the formation of a deconfined medium. The phenomenon has not been observed in asymmetric proton-lead collisions, motivating the study of systems of intermediate size. We present the measurement of the nuclear modification factor of charged particles in minimum-bias oxygen-oxygen and neon-neon collisions at a center-of-mass energy of 5.36 TeV, with corresponding integrated luminosity 6.1 nb-1 and 0.76 nb-1 collected by CMS in 2025. The system size dependence of nuclear suppression is investigated through comparison with existing measurements of xenon-xenon and lead-lead collisions.

        Speakers: Ms Dorottya Cynolter, Dorottya Judit Cynolter (Eotvos Lorand University (HU))
        posterRAA_LHCP26_DC_final.pdf
      • 138
        51. Toward BTL Installation in CMS: TIF Progress on BTST Integration, Tray Qualification, and System Readiness

        The Barrel Timing Layer (BTL) of the CMS MIP Timing Detector is entering a key integration phase at the Tracker Integration Facility (TIF). Current activities focus on the practical readiness for installation into the BTST, including rails and insertion tooling, support and roller-block elements, service integration, cabling, and tray pre-commissioning. Reception and commissioning tests on delivered trays validate the readout chain, SiPM biasing, TEC performance, and operational stability, while larger-scale TIF preparations address handling, support structures, and system integration. This poster presents the status of these TIF-based BTL activities and their role in the transition from production to full integration.

        Speaker: Licheng ZHANG (University of Maryland (US))
        cms-btl-tif-status-poster-v2.pdf
      • 139
        52. CMS MTD Barrel Timing Layer: Tray Building and Testing

        For the High Luminosity-LHC, the CMS detector is undergoing a major upgrade that includes the addition of a MIP Timing Detector (MTD). The central part of the MTD, the Barrel Timing Layer (BTL), is designed to measure the arrival time of charged particles with a precision of 30 ps. The detector units of BTL are mounted on the cooling plate to form a tray. Tray building and testing is the last step of assembly and QA/QC work at assembly centers (ACs), which plays a key role in the following pre-commissioning and integration at CERN. This poster presents the tray assembly procedure and QA/QC results.

        Speaker: Mingxuan Zhang (Peking University (CN))
        poster.pdf
      • 140
        53. CMS MTD Barrel Timing Layer: Sensor Modules and Detector Modules

        As part of the High Luminosity-LHC upgrade, a MIP Timing Detector (MTD) is being added to the CMS detector. Its central component, the Barrel Timing Layer (BTL), is designed to measure the arrival time of charged particles with a precision of 30 ps. The basic unit of the BTL is a Sensor module, created by sandwiching LYSO scintillating crystals between Silicon Photomultipliers (SiPMs). Integrating two sensor modules into a copper housing forms a Detector module. The process of assembling sensor modules, integrating them into detector modules, and finally installing them into full trays requires careful precision and craftsmanship. In this poster, I present the assembly, testing, and quality control procedures for sensor modules and detector modules.

        Speaker: Maria Jose (University of Virginia (US))
        LHCP2026.pdf
      • 141
        54. ML-Based Event Reconstruction in the CMS High Granularity Calorimeter

        The High Luminosity LHC (HL-LHC) will significantly increase event rates and pileup, requiring reconstruction algorithms that remain efficient and robust in heavily populated environments. CMS will address this challenge by replacing its endcap calorimeters with the High Granularity Calorimeter (HGCAL), providing fine three dimensional position of the energy deposits and precision timing. To exploit this information, CMS is developing the The Iterative CLustering (TICL) reconstruction framework in the CMS software, where machine learning is already a key ingredient. This poster summarizes the use of machine learning throughout the HGCAL event reconstruction chain, from clustering and pattern recognition to object identification and linking into particle candidates. We highlight recent studies on ML driven electromagnetic reconstruction, including a learning based approach to associate and merge reconstructed components in ambiguous multi candidate configurations by the first time implementation of the timing information. The method is validated across detector regions and overlap topologies and improves robustness in challenging regimes where traditional rule-based methods degrade. We also outline future directions, including deeper integration of precision timing and more unified learning based strategies, to sustain reconstruction performance under HL-LHC conditions.

        Speaker: Gamze Sokmen (Centre National de la Recherche Scientifique (FR))
        LHCP26_Sokmen.pdf
      • 143
        56. Search for ZZ vector boson scattering in the llvv final state at 13 TeV

        We present a search for the electroweak production of two Z bosons in association with two jets at a center-of-mass energy of 13 TeV. The analysis focuses on the decay channel with two charged leptons (electrons or muons) and two neutrinos, which features a relatively large branching fraction but also suffers from sizable backgrounds and incomplete event reconstruction due to the presence of neutrinos.To enhance the separation between the electroweak signal and the dominant backgrounds, a machine-learning based graph neural network discriminator is employed, together with multiple dedicated control regions to constrain background contributions. In particular, a fully data-driven estimation of the Drell–Yan background plays a crucial role in the analysis. The expected (observed) significance in the 2ℓ2ν channel is 2.8 (3.0) standard deviations. When combined with the VBS ZZ 4ℓ channel, the expected (observed) significance becomes 4.5 (5.0) standard deviations, thereby we claim observation of the last electroweak production of vector diboson processes in CMS experiment. In addition, we measure the fiducial cross section and set limits on dimension-8 EFT operators.

        Speaker: Hong Gao (Beihang University (CN))
        poster_v3.pdf
      • 144
        58. The CMS TEPX detector for the Phase-2 Inner Tracker Upgrade: Thermal Performance and Simulation Results

        During Long Shutdown 3, the Large Hadron Collider (LHC) at CERN will undergo an upgrade program, marking the beginning of the High-Luminosity era. The High-Luminosity Large Hadron Collider (HL-LHC) is expected to collide protons at a centre-of-mass energy of 14 TeV and to reach the unprecedented peak instantaneous luminosity of 7 x 10^34 cm^-2 s^-1 with the average number of pileup events between 140 and 200. This will allow the ATLAS and CMS experiments to collect integrated luminosities up to 3000 fb^-1 over 10 years of data taking. To cope with this extreme scenario, the CMS detector will be substantially upgraded before the start of the HL-LHC, as part of the CMS Phase-2 Upgrade. The entire CMS tracking system will be replaced, in particular the Inner Tracker (IT). The new detector will feature increased radiation hardness, higher granularity, larger acceptance and capability to handle higher data rate and longer trigger latency. The upgraded IT will consist of a barrel part (TBPX) plus eight small disks (TFPX) and four large disks (TEPX) per side. The TEPX disks will host pixel modules arranged in five concentric rings and will extend the coverage up to |eta|=4.0. In this contribution the new TEPX detector is presented, with particular focus on its mechanical structure and thermal performance. Along with the other Inner Tracker sub-sections, TEPX features an effective CO2 cooling system integrated within a very light support mechanics, where power and data lines are also embedded. The cooling design implements titanium pipes to keep a low material budget while ensuring that the modules temperature remains well below the critical value to avoid thermal runaway. A pre-production prototype of the TEPX disk that will be installed in the final detector has been tested under operational conditions to assess its thermal behavior and several measurements have been carried out in different regions of the disk. A comparison between experimental results and thermal simulations performed using finite element analysis is presented, including studies of how improving the thermal conductivity of certain interfaces would affect performance. Finally, the extrapolation to end-of-life thermal behavior is discussed, accounting for the expected increase in power density and sensor leakage current over time.

        Speaker: Giovanni Celotto (University of Zurich (CH))
        LHCP26_TEPX_poster.pdf
      • 145
        59. Search for four top and VLL production in channels with taus

        The first study of four top quark production in final states with hadronically decaying tau leptons (th) is presented using proton-proton collision data collected by the CMS experiment at a center-of-mass energy of 13 TeV during the 2016–2018 period at the CERN LHC. This dataset corresponds to an integrated luminosity of 138 fb−1. The tau channel is divided into subchannels with zero, one, and two additional light leptons (electrons or muons) to optimize sensitivity. The combined analysis yields an observed (expected) significance of 1.0 (1.0) standard deviations. The production cross section of four top quarks is measured to be 16.1 +13.5−12.3 (stat) +11.9−8.3 (syst) fb. Additionally, a search is performed for vector-like leptons within the framework of the 4321 model in the same tau phase space. No significant excess is observed, and a lower limit of 834 GeV at 95% confidence level is set on the vector-like lepton mass, providing the first constraints from final states containing light leptons.

        Speaker: Huiling Hua (Chinese Academy of Sciences (CN))
        poster_Huiling_v2.pdf
      • 146
        60. Measurement of the Z->mu mu angular polarization coefficients at \sqrt(s) = 13 TeV

        A measurement of the eight angular polarization coefficients, A0 to A7, in the Drell– Yan process cross section is presented using the dimuon final state. The analysis is based on proton–proton collision data recorded with the CMS detector at the LHC at a center-of-mass energy of \sqrt(s) = 13 TeV, corresponding to an integrated luminosity of 138fb^(-1). The coefficients are determined double differentially in eight intervals of transverse momentum and two intervals of rapidity of the muon pair \mu+\mu-. The results are presented for the \mu+\mu- invariant mass range 81–101 GeV and are compared to theoretical predictions incorporating next-to-next-to-leading order perturbative quantum chromodynamics. The measurement provides relevant information about the underlying partonic dynamics and the Z boson production mechanisms.

        Speaker: Vladislav Shalaev (Joint Institute for Nuclear Research (RU))
        Poster_LHCP_v12052026.pdf
      • 147
        61. Measurement of the W boson mass at CMS

        This poster presents the measurement of the W boson mass (mW) at the CMS experiment, published in 2024 and representing the most precise determination at the LHC, with an uncertainty of 9.9 MeV. The poster covers some of the most important aspects of the analysis, with a particular focus on the detailed measurement of the muon efficiency scale factors, which play a fundamental role in ensuring good agreement between data and simulation before performing the final fit to mW.

        Speaker: Ruben Forti (Universita & INFN Pisa (IT))
        Wmass_poster_LHCP_RF.pdf
      • 148
        62. Physics for all ages: ATLAS educational printables for informal learning

        The ATLAS Collaboration at CERN has developed a wide array of resources to support informal education for all ages. From colouring books and activity sheets for children, to fact sheets and cheat sheets for more advanced learners, ATLAS Outreach provides a collection of printable resources that can be used to learn more about particle physics and the ATLAS detector. In particular, ATLAS recently released an updated version of one of its colouring books, with brand-new illustrations and a focus on detector upgrades for HL-LHC. All these resources can be used in diverse contexts: at home, in classrooms, at science festivals and outreach events, and more. To ensure global accessibility, the resources are translated into multiple languages. This contribution highlights the most recent content additions, and the collaborative workflow behind these resources, from topic identification and design, to review and translation.

        Speaker: Elise Maria Le Boulicaut Ennis (Yale University (US))
        PhysicsForAllAges_poster_LHCP_05.19.2026.pdf
      • 149
        63. ATLAS On the Air! - Measuring the Success of the ATLAS Virtual Visit Programme

        Since 2010, ATLAS Virtual Visits have revolutionised HEP outreach by connecting its collaboration members with audiences worldwide. The Virtual Visit model brings inspiring scientific outreach events to visitors who would otherwise not have such an opportunity. Over the years, by offering the visits in a variety of languages and using a variety of online platforms, we have expanded their scope, engaging a broad and diverse audience, including parliaments, businesses, festivals, retirement homes, experiments, and even prisons. The visits, presented in front of the detector or the control room, stimulate audience engagement and offer excellent communication training to members of the collaboration. The programme, including its history, highlights and newly compiled statistics, has been summarised to be submitted for publication in the first peer-reviewed LHC collaboration-endorsed outreach paper. We present it here.

        Speaker: Dilia Maria Portillo Quintero (TRIUMF (CA))
        ATLASVisits_LHCP2026_260519_153344.pdf
      • 150
        64. Search for Higgs boson pair production in association with top-quark pairs using LHC Run 2 and partial Run 3 data with the ATLAS detector

        The first ATLAS search for non-resonant Higgs boson pair production in association with a top-quark pair ($ttHH$) is presented. The search targets three distinct final states expected from the $ttHH$ decay: (i) one lepton (electron or muon) with at least four b-quarks, (ii) at least two b-quarks accompanied by a same-sign dilepton pair or multiple leptons, and (iii) at least three b-quarks with two photons. The proton-proton collision dataset used corresponds to an integrated luminosity of 196 $\textrm{fb}^{-1}$, consisting of 140 $\textrm{fb}^{-1}$ at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV and 56 $\textrm{fb}^{-1}$ at $\sqrt{s}$ = 13.6 TeV. The $ttHH$ production cross section relative to its Standard Model prediction is found to be $\mu_{ttHH}=−3^{+11}_{-12}$ with its predicted value of $\mu_{ttHH}=1_{-10}^{+10}$. It corresponds to a 95% confidence-level upper limit on the ttHH production cross section of 19.7 times the Standard Model prediction, with an expected limit of 21.2.

        Speaker: Giovanni Rupnik Boero (CERN / Universite de Geneve (CH))
        LHCP2026_RupniKBoero.pdf
      • 151
        65. Latest HL-LHC b-tagging developments and expected impact on di-Higgs sensitivity

        The High-Luminosity Large Hadron Collider (HL-LHC) will open new opportunities for the study of rare processes, including Higgs boson pair (di-Higgs) production. Flavour tagging will play a central role in enabling these measurements. This poster presents the expected challenges for flavour tagging in the HL-LHC environment, characterized by unprecedented instantaneous luminosity, high pile-up conditions, and the upgraded ATLAS detector. Particular emphasis is placed on the projected performance of the current flavour-tagging neural network, GN2, when trained and evaluated on simulated Run 4 datasets. The implications for future di-Higgs analyses are discussed, highlighting the critical importance of flavour-tagging performance for achieving sensitivity to this key measurement in the Higgs sector.

        Speaker: Vincenzo Triglione (CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR))
        Triglione_LHCP2026.pdf
      • 152
        66. Tau Identification performance using a transformer-based neural network algorithm

        GNTau is a hybrid graph transformer-based neural network algorithm for the identification of the visible decay products of hadronic taus, used by the ATLAS experiment in Run 3 of the LHC. The algorithm is inspired by [Nature Commun. 17 (2026) 541] and supersedes the previous recurrent neural network (RNN) based approach [ATL-PHYS-PUB-2022-044]. Information from reconstructed charged-particle tracks, energy clusters in the calorimeter associated to candidates, and high-level discriminating variables are combined to discriminate hadronic taus from standard jets, originating from heavy-flavour jets (b/c), light quarks (u/d/s) and gluon-initiated jets. This poster presents the performance of the new GNTau algorithm using simulated events, and compares with the previous RNN-based approach. The new algorithm offers substantial gains in background rejection for the same signal selection efficiency, for several classes of analysis including measurements of Higgs boson (pair) production and couplings, and BSM searches involving 3rd generation fermions.

        Speaker: Chamathka Nirmani Thotamuna Wijewardhana (Stony Brook University (US))
        LHCP2026 Poster 7.pdf
      • 153
        67. Measurement of the $|V_{cb}|$ element of the CKM matrix in $t\bar{t}$ decays with the ATLAS detector.

        We present an analysis developed to measure the CKM matrix element $|V_{cb}|$ using on-shell hadronic W boson decays in single lepton $t\bar{t}$ events collected by the ATLAS experiment at the LHC. The analysis targets Run~2 (pp) collision data at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 140 fb$^{-1}$. Existing determinations of $|V_{cb}|$ rely on inclusive and exclusive B-hadron decays, between which a tension of about 3 sigma is observed. In contrast, this measurement exploits the proportionality of the $W \rightarrow cb$ branching ratio to $|V_{cb}|^{2}$, providing a direct determination at the electroweak scale. Although the precision is not yet competitive with the current world average from low-energy measurements, this result constitutes the first determination of $|V_{cb}|$ from on-shell W boson decays and provides a crucial, orthogonal test of existing results. This work establishes a foundation for more precise measurements at the LHC in the future.

        Speaker: Adam Warnerbring (Universitaet Siegen (DE))
        AW_LHCP_poster_Vcb.pdf
      • 154
        68. Recent results on the search for the Non-Resonant Production of Higgs Boson Pairs in the bbtautau Final State with the ATLAS Detector

        The HH → bbττ channel is among the most sensitive final states for probing Higgs boson pair production at the LHC, benefiting from the large H → bb branching fraction and the clean signatures of τ decays. The analysis is nevertheless challenged by significant backgrounds from $t\bar{t}$, Z+heavy flavour, single-Higgs production, and multijet processes. This poster presents the inclusive analysis strategy, detailing the background modelling and the multivariate techniques used to define signal and control regions and to enhance signal discrimination. The latest results are presented and discussed, with emphasis on the upper limit set on the Higgs boson pair production signal strength (μ_{HH}) and constraints on Higgs self-coupling parameters ($κ_λ$ and $κ_{2V}$).

        Speaker: Cen Mo (Shanghai Jiao Tong University (CN))
        LHCP Poster 2026 - v4.pdf
      • 155
        69. Anisotropic transport coefficients and observables in a hot QCD medium at finite baryon asymmetry

        We have studied how weak momentum anisotropy, generated by the asymptotic expansion of baryon asymmetric matter in the initial stages of ultrarelativistic heavy ion collisions, modifies the charge and the heat transport coefficients and their associated observables. The electrical and the thermal conductivities are computed by solving the relativistic Boltzmann transport equation in the relaxation time approximation within the kinetic theory framework. Partonic interactions are incorporated through the quasiparticle distribution functions at finite temperature, anisotropy and baryon asymmetry. Additionally, we analyze the local equilibrium property of the medium through the Knudsen number and examine the interplay between the heat flow and the charge flow through the Lorenz number in the Wiedemann-Franz law for an anisotropic hot QCD medium at finite baryon asymmetry. Our results show that the expansion-induced anisotropy suppresses both electrical and thermal conductivities in baryonless as well as in baryon asymmetric matter. Conversely, in both isotropic and anisotropic scenarios, the electrical and the thermal conductivities remain higher in baryon asymmetric matter than in baryonless matter. The above results are broadly attributed to the anisotropy-driven deformation of partonic distribution functions and modified partonic dispersion relations, leading to measurable consequences for equilibrium characteristics and the relative behavior of the heat and charge flow in the anisotropic hot QCD medium at finite baryon asymmetry.

        Speaker: Dr Shubhalaxmi Rath (Universidad Mayor)
        PosterLHCP2026_Shubhalaxmi.pdf
      • 156
        70. Centrality dependence of Tsallis parameters and freeze-out proxies from identified-hadron spectra in Pb–Pb collisions at √sNN = 2.76 TeV

        Soft hadron production in heavy-ion collisions is sensitive to the degree of equilibration and to the strength of collective expansion, both of which vary strongly with collision centrality. We study identified-hadron transverse-momentum (pT) spectra in Pb–Pb collisions at √sNN = 2.76 TeV over centralities from 0–5% to 80–90% using a Tsallis-type parameterization to extract the effective temperature T, the non-extensivity parameter q, and the mean transverse momentum ⟨pT⟩ for each species (π±, K±, p, p̄; and, where available, K0S and Λ). Clear and systematic centrality trends are observed. For π+ the extracted q increases from 1.1180 ± 0.0047 (0–5%) to 1.1607 ± 0.0027 (80–90%), while T decreases from 0.1173 ± 0.0044 GeV to 0.0723 ± 0.0019 GeV, indicating larger deviations from an exponential-like shape and a cooler effective slope toward peripheral events. For protons, q is near unity in the most central bin (1.0003 ± 0.0044) and rises to 1.0909 ± 0.0041 in 80–90%, with T decreasing from 0.4185 ± 0.0088 GeV to 0.1452 ± 0.0066 GeV. Using linear mass-scaling systematics, we define a kinetic freeze-out proxy ⟨T0⟩ that decreases from 0.0617 ± 0.0031 GeV (0–5%) to 0.0352 ± 0.0071 GeV (80–90%), and a transverse-flow proxy ⟨βT⟩ that increases from 0.0865 ± 0.0063 c (80–90%) to 0.3771 ± 0.0087 c (central). Overall, the mass ordering and the strong centrality evolution of ⟨βT⟩ are consistent with substantially stronger collective expansion in central Pb–Pb collisions, while peripheral events show weaker flow and larger non-extensive features.

        Speaker: Prof. Haifa I Alrebdi (Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia))
        pbpb_freezeout_A0_poster.pdf
    • Plenary Session: BSM searches and EW physics Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Convener: Shahram Rahatlou (Sapienza Universita e INFN, Roma I (IT))
      • 157
        Search for Dark Sector signatures and dark matter
        Speaker: Sezen Sekmen (Kyungpook National University (KR))
        SekmenDSDMLHCP26.pdf
      • 158
        Higgs boson and EW precision predictions
        Speaker: Simone Devoto (Universiteit Gent)
        Devoto_LHCP26_plenary.pdf
      • 159
        Precision and rare EW processes
        Speaker: Ankita Mehta (CERN)
        LHCP2026_anmehta.pdf
  • Wednesday 20 May
    • Plenary Session: QCD physics and AI/ML Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Convener: Roberto Salerno (CNRS/IN2P3 - LLR, École polytechnique)
    • 10:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Parallel : EWK Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Camilla Vittori (Universita e INFN, Bologna (IT)), Ezra Lesser (Los Alamos National Laboratory), Mario Pelliccioni (Pavia University and INFN (IT)), Mathieu Pellen (University of Freiburg (DE))
    • Parallel : Flavor Physics Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Chiara Ilaria Rovelli (Sapienza Universita e INFN, Roma I (IT)), Conor Fitzpatrick (The University of Manchester (GB)), Cristina Terrevoli (Universita e INFN, Bari (IT)), Yue Xu (University of Washington (US))
    • Parallel : Heavy Ions: Light ion session Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Aleksas Mazeliauskas, Fiorella Fionda (Universita e INFN, Cagliari (IT)), Jing Wang (Massachusetts Inst. of Technology (US)), Qipeng Hu (University of Science and Technology of China (CN)), Thomas Boettcher (Indiana University (US))
    • Parallel : Performance and ML/AI Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Anna Benecke (Universite Catholique de Louvain (UCL) (BE)), Bingxuan Liu (Sun Yat-Sen University (CN)), Flo Reiss (University of Freiburg (DE)), Mesut Arslandok (Yale University (US)), Tilman Plehn
      • 180
        Model agnostic data reinterpretation at LHCb
        Speaker: Marco Colonna (Technische Universitaet Dortmund (DE))
        MColonna_LHCP_2026_v2.pdf
      • 181
        Run 3 object performance ATLAS
        Speaker: Christos Anastopoulos (University of Sheffield (GB))
        ATLAS_CP.pdf
      • 182
        Variance reduction with Normalizing Flows
        Speaker: Rene Poncelet (IFJ PAN Krakow)
        2026.05.20-Paris-LHCP-poncelet.pdf
      • 183
        Run 3 object performance ALICE
        Speaker: Christian Sonnabend (CERN, Heidelberg University (DE))
        LHCP2026.pdf
      • 184
        Run 3 object performance LHCb
        Speaker: Pol Vidrier Villalba (University of Barcelona (ES))
        LHCP_LHCbRun3ObjectPerformance.pdf
    • Parallel : Top Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Ezra Lesser (Los Alamos National Laboratory), Nedaa Alexandra Asbah (CERN), Sergio Sanchez Cruz (Universidad de Oviedo (ES))
    • 12:30
      Lunch Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • IAC meeting

      https://indico.cern.ch/event/1673664/

    • Parallel : Feebly interacting particles Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Aoife Bharucha, Arantza De Oyanguren Campos (Univ. of Valencia and CSIC (ES)), Benedikt Maier (Imperial College (GB)), Sukanya Sinha (The University of Manchester (GB))
    • Parallel : Flavor Physics Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Chiara Ilaria Rovelli (Sapienza Universita e INFN, Roma I (IT)), Conor Fitzpatrick (The University of Manchester (GB)), Cristina Terrevoli (Universita e INFN, Bari (IT)), Yue Xu (University of Washington (US))
    • Parallel : Performance and ML/AI Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Anna Benecke (Universite Catholique de Louvain (UCL) (BE)), Bingxuan Liu (Sun Yat-Sen University (CN)), Flo Reiss (University of Freiburg (DE)), Mesut Arslandok (Yale University (US)), Tilman Plehn
    • Parallel Joint Session : Higgs + Top (in Higgs) Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Emanuele Di Marco (INFN, Roma 1 (IT)), Ezra Lesser (Los Alamos National Laboratory), Johannes Alf Braathen (DESY), Nedaa Alexandra Asbah (CERN), Sergio Sanchez Cruz (Universidad de Oviedo (ES)), Valentina Cairo (CERN)
      • 206
        Precision calculations for di-Higgs and ZH at LHC

        15' presentation + 3' discussion

        Speaker: Daniel Stremmer (KIT)
        stremmer_lhcp26.pdf
      • 207
        State of the art calculations for $t\bar{t}H$ cross section

        15' presentation + 3' discussion

        Speaker: Alessandro Broggio
        Broggio_LHCP26.pdf
      • 208
        Top+Higgs (t+H, ttH, ttHH) with focus on background modeling (ATLAS)

        15' presentation + 3' discussion - ATLAS speaker

        Speaker: Jelena Jovicevic (Institute of Physics, University of Belgrade (RS))
        Jelena_LHCP_2026.pdf
      • 209
        Top+Higgs (t+H, ttH, ttHH) with focus on background modeling (CMS)

        15' presentation + 3' discussion - CMS speaker

        Speaker: Jindrich Lidrych (Universite Catholique de Louvain (UCL) (BE))
        Top+Higgs-LHCP26-JLidrych-final.pdf
    • Parallel Joint Session : QCD + EWK (in QCD) Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Camilla Vittori (Universita e INFN, Bologna (IT)), Davide Zuliani (Universita e INFN, Padova (IT)), Ezra Lesser (Los Alamos National Laboratory), Jesse Liu (New York University), Mario Pelliccioni (Pavia University and INFN (IT)), Mathieu Pellen (University of Freiburg (DE)), Rene Poncelet (IFJ PAN Krakow)
      • 210
        Strong coupling determinations from jet cross sections
        Speaker: Joao Pires (LIP - Laboratorio de Instrumentação e Física Experimental de Partículas (PT))
        JPires_LHCP_PDF.pdf
      • 211
        Theory uncertainties for strong coupling determinations from pT(V)
        Speaker: Giulia Marinelli
        lhcp26_marinelli.pdf
      • 212
        V+jets measurements (CMS)
        Speaker: Andrea Bulla (Universita e INFN, Padova (IT))
        LHCP 2026.pdf
      • 213
        ATLAS measurements of the strong coupling constant
        Speaker: Alexis Vallier (L2I Toulouse, CNRS/IN2P3, UT3)
        avallier_LHCP2026_alphaS_ATLAS.pdf
    • 15:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Plenary Session: Flavor physics Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Francesco Polci (Centre National de la Recherche Scientifique (FR)), Sneha Sirirshkumar Malde (University of Oxford (GB))
    • 20:30
      Outreach event Amphitheatre Binet (Université Paris Cité, Campus Saint-Germain-des-Prés)

      Amphitheatre Binet

      Université Paris Cité, Campus Saint-Germain-des-Prés

      45 rue des Saints-Pères 75006 Paris

      See https://indico.cern.ch/event/1677556/ for more details and to register

  • Thursday 21 May
    • Plenary Session: Heavy Ions physics Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Boris Hippolyte (IPHC / Université de Strasbourg (FR)), David Dobrigkeit Chinellato (Austrian Academy of Sciences (AT))
      • 219
        Particle production and collectivity from small to large collision systems
        Speaker: Qipeng Hu (University of Science and Technology of China (CN))
        LHCP2026-ProductionCollectivity-QipengHu-v3.pdf
      • 220
        Recent theory developments in Heavy Ion Physics
        Speaker: Liliana Apolinario (LIP (PT))
        HI_TH_LApolinario.pdf
      • 221
        Investigating interactions in the quark-gluon plasma with high pT and heavy flavour
        Speaker: Preeti Dhankher Lesser (Nikhef National institute for subatomic physics (NL))
        LHCP2026_PDhankher.pdf
    • 10:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Parallel : Future Colliders/Detectors Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Francesca Carnesecchi (Universita e INFN, Bologna (IT)), Jan Eysermans (Massachusetts Inst. of Technology (US)), Philipp Roloff (CERN), Samuel Homiller (University of Pittsburgh), Simone Pagan Griso (Lawrence Berkeley National Lab. (US))
    • Parallel : Heavy Ions Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Aleksas Mazeliauskas, Fiorella Fionda (Universita e INFN, Cagliari (IT)), Jing Wang (Massachusetts Inst. of Technology (US)), Qipeng Hu (University of Science and Technology of China (CN)), Thomas Boettcher (Indiana University (US))
      • 227
        Experimental overview of bulk properties probed by light flavor hadrons
        Speaker: Zhiyong Lu (China Institute of Atomic Energy (CN))
        Zhiyong_LHCP2026.pdf
      • 228
        Flow in ultracentral heavy-ion collisions
        Speaker: Jean-Yves OLLITRAULT
        Ollitrault_LHCP.pdf
      • 229
        Experimental overview of jet and medium response in heavy ion collisions
        Speaker: Martin Spousta (Charles University)
        Spousta_LHCP2026_20260518_v2.pdf
      • 230
        Jet and heavy quark quenching in heavy-ion collisions
        Speaker: Magdalena Djordjevic
        MagdalenaDjordjevic_LHCP2026.pdf
      • 231
        Experimental overview of heavy flavor and quarkonia in heavy ion collisions
        Speaker: Biao Zhang (Heidelberg university(DE))
        LHCP2026_Paris_Biao_v7.pdf
    • Parallel : Performance and ML/AI Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Anna Benecke (Universite Catholique de Louvain (UCL) (BE)), Bingxuan Liu (Sun Yat-Sen University (CN)), Flo Reiss (University of Freiburg (DE)), Mesut Arslandok (Yale University (US)), Tilman Plehn
      • 232
        ML and MadGraph
        Speaker: Theo Heimel (UCLouvain)
        theo_heimel_madgraph7.pdf
      • 233
        ML and Detector Simulation
        Speaker: Lorenzo Valente (University of Hamburg)
        LHCP2026_final.pdf
      • 234
        ML and Hadronization
        Speaker: Ayodele Ore
        ml_hadronization_lhcp.pdf
      • 235
        ML and Unfolding
        Speaker: Dr Sascha Diefenbacher (Institut für Theoretische Physik, Universität Heidelberg)
        LHCP_Unfold.pdf
      • 236
        Usage of GPUs for ALICE Reconstruction in the ALICE Online Compute farm and in the Grid
        Speaker: David Rohr (CERN)
        2026-05-21 LHCP.pdf
    • Parallel : TeV Scale and prompt signatures: Massive Resonances Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Arne Christoph Reimers (CERN), Daniel Hayden (Michigan State University (US)), Giacomo Cacciapaglia
      • 237
        New massive resonances at the LHC
        Speaker: Rosy Caliri
        Rosy_Caliri.pdf
      • 238
        Recent ATLAS results on searches for heavy gauge bosons from extended gauge symmetries
        Speaker: Yanjun Tu (University of Hong Kong (HK))
        LHCP05212026.pdf
      • 239
        Recent CMS results on searches for heavy gauge bosons from extended gauge symmetries
        Speaker: Ilia Kalaitzidou (Universite Libre de Bruxelles (BE))
        LHCP26_Kalaitzidou.pdf
      • 240
        Recent ATLAS results on searches for strongly coupled and exotic massive resonances
        Speaker: Carlos Moreno Martinez (Universite de Geneve (CH))
        CMoreno_LCHP2026.pdf
      • 241
        Recent CMS results on searches for strongly coupled and exotic massive resonances
        Speaker: Dawei Fu (Peking University (CN))
        revised_dawei_lhcp2026.pdf
    • Parallel : Top Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Ezra Lesser (Los Alamos National Laboratory), Nedaa Alexandra Asbah (CERN), Sergio Sanchez Cruz (Universidad de Oviedo (ES))
      • 242
        Top mass measurements and properties by ATLAS
        Speaker: Prof. Juan Terron Cuadrado (Universidad Autonoma de Madrid (ES))
        toplhcp2026jtv4.pdf
      • 243
        NNLO predictions for ttj production
        Speaker: Heribertus Bayu Hartanto (Asia Pacific Center for Theoretical Physics (APCTP), Pohang, South Korea)
        Bayu_LHCP_2026.pdf
      • 244
        Recent results on ttbar and single top production cross section from CMS
        Speaker: Jose Enrique Palencia Cortezon (Universidad de Oviedo (ES))
        LHCP2026_palencia.pdf
      • 245
        Recent results on ttbar and single top production cross section from ATLAS
        Speaker: Enzo Canonero (Royal Holloway, University of London (GB))
        TopCrossSections_atlas.pdf
      • 246
        Measurements of top quark production cross sections and its charge asymmetry by the LHCb collaboration
        Speaker: Jiuzhao Li (Central China Normal University CCNU (CN))
        Top_LHCb.pdf
    • 12:30
      Lunch Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Parallel : Feebly interacting particles Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Aoife Bharucha, Arantza De Oyanguren Campos (Univ. of Valencia and CSIC (ES)), Benedikt Maier (Imperial College (GB)), Sukanya Sinha (The University of Manchester (GB))
      • 247
        Theory overview of dark sectors at colliders
        Speaker: Christiane Scherb
        darksectors_scherb.pdf
      • 248
        Recent CMS results on Extended dark sectors
        Speaker: Noemi Palmeri (Sapienza Universita e INFN, Roma I (IT))
        210526_lhcp.pdf
      • 249
        Recent ATLAS results on Extended dark sectors
        Speaker: John Stupak (University of Oklahoma (US))
        Stupak_LHCP2026_darkSectors_260518v3.pdf
      • 250
        Recent results from ATLAS, CMS & LHCb on searches for new bosons with DM candidates
        Speaker: Francisco Sili (University of Science and Technology of China (CN))
        26-05-21-SILI-LHCP.pdf
      • 251
        LHCb - New strategies for LLP searches
        Speaker: Jiahui Zhuo (Univ. of Valencia and CSIC (ES))
        LHCP 2026 BUSCA (4).pdf
    • Parallel : Heavy Ions Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Aleksas Mazeliauskas, Fiorella Fionda (Universita e INFN, Cagliari (IT)), Qipeng Hu (University of Science and Technology of China (CN)), Thomas Boettcher (Indiana University (US))
      • 252
        Experimental overview of parton structure probed in ion collisions
        Speaker: Iwona Grabowska-Bold (AGH University of Krakow (PL))
        LHCP2026-nPDF-052026.pdf
      • 253
        Nuclear PDFs
        Speaker: Katrin Greve
        lhcp26_nuclearPDFs.pdf
      • 254
        Experimental overview of "medium effects" in small systems
        Speaker: Qiuchan Lu (LLR, Centre National de la Recherche Scientifique (FR))
        LHCP26_MediumEffects_QL.pdf
      • 255
        Initial state and pre-equilibrium physics
        Speaker: Oscar Garcia-Montero (Universität Bielefeld)
        LHCP2026_OGM.pdf
      • 256
        Hadronization of light and heavy flavors from small to large system
        Speaker: Dukhishyam Mallick (Universita e INFN, Cagliari (IT))
        Hadronization_HF_LF_LHCP2026_Experiment_DM.pdf
    • Parallel : Higgs Physics: Higgs self-coupling Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Emanuele Di Marco (INFN, Roma 1 (IT)), Ezra Lesser (Los Alamos National Laboratory), Johannes Alf Braathen (DESY), Valentina Cairo (CERN)
      • 257
        Theory calculations for SM $HH$: ggF, VBF productions

        15' presentation + 3' discussion

        Speaker: Dr Arunima Bhattacharya (Instituto de Física Corpuscular (University of Valencia), Spain)
        PPT_____EW_corrections_to_di_Higgs.pdf
      • 258
        Theory calculations for BSM Higgs, baryogenesis, stability of the universe

        15' presentation + 3' discussion

        Speaker: Simone Tentori (UCLouvain)
        LHCP26_DiHiggs_Tentori.pdf
      • 259
        Experimental results on HH and Multi-Higgs (ATLAS)

        15' presentation + 3' discussion - ATLAS speaker

        Speaker: Danijela Bogavac (IFAE)
        DBogavac_LHCP2026.pdf
      • 260
        Experimental results on HH and Multi-Higgs (CMS)

        15' presentation + 3' discussion - CMS speaker

        Speaker: Mathis Frahm (Hamburg University (DE))
        hh_multihiggs_lhcp.pdf
      • 261
        H+HH combinations, HH ATLAS+CMS Combination

        Focus on full Run 2 data, with HL-LHC projections - CMS speaker (15' presentation + 3' discussion)

        Speaker: Ana Sculac (University of Split. Fac.of Elect. Eng., Mech. Eng. and Nav.Architect. (HR))
        H_HH_combination_LHCP2026.pdf
    • Parallel : Performance and ML/AI Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Anna Benecke (Universite Catholique de Louvain (UCL) (BE)), Bingxuan Liu (Sun Yat-Sen University (CN)), Flo Reiss (University of Freiburg (DE)), Mesut Arslandok (Yale University (US)), Tilman Plehn
    • Parallel : Top Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Ezra Lesser (Los Alamos National Laboratory), Nedaa Alexandra Asbah (CERN), Sergio Sanchez Cruz (Universidad de Oviedo (ES))
      • 267
        Recent results on predictions for bb4l production
        Speaker: Luca Buonocore (CERN)
        LHCP26_LB.pdf
      • 268
        Differential bb4l by ATLAS
        Speaker: Mr Stefan Kluth (Max Planck Society (DE))
        LHCP2026_ATLAS_SKluth.pdf
      • 269
        Resummation for 4top production
        Speaker: Tommaso Saracco (Nikhef)
        4top-LHCP2026-Saracco.pdf
      • 270
        Decay modeling in 4top production

        In this talk I present NLO QCD predictions for the $$pp\to t\bar{t}t\bar{t}+X$$ process in the 4 lepton decay channel at the integrated and differential level for the LHC centre-of-mass energy of $$\sqrt{s}=13.6$$ TeV. Specifically I compare the fixed order NLO QCD calculations to the parton-shower matched results obtained with MC@NLO and POWHEG matching. In the former, NLO QCD corrections are consistently included in the production and decay of the four top quarks, preserving all spin correlations. In the latter, higher order effects in top-quark decays with approximate spin correlations are simulated in the parton showers, using Pythia. Additionally I analyse the impact of including matrix element corrections in the top quark decays in the parton-shower matched predictions.

        Speaker: Manal Alsairafi
        Alsairafi_LHCP2026.pdf
      • 271
        Measurement of rare production and decay modes CMS
        Speaker: Huiling Hua (Chinese Academy of Sciences (CN))
        lhcp2026_Huiling_v2.pdf
    • 15:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Plenary Session: Higgs boson SM and beyond Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Lucia Di Ciaccio (Centre National de la Recherche Scientifique (FR)), Sarah Marie Demers (Yale University (US))
      • 272
        EFT interpretation of measurement: advantages and disadvantages
        Speaker: Eleni Vryonidou (University of Cyprus (CY))
        Vryonidou_LHCP2026.pdf
      • 273
        DiHiggs non-resonant production and rare Higgs decays at LHC
        Speaker: Marina Kolosova (University of Florida (US))
        MKolosova-LHCP2026.pdf
      • 274
        Measurement of Higgs boson production and properties
        Speaker: Alessandro Tarabini (ETH Zurich (CH))
        LHCP2026_tarabini.pdf
      • 275
        BSM scenarios with the Higgs boson
        Speakers: Kei Yagyu (Tokyo University of Science), Dr Kei Yagyu (Osaka University)
        2026-5-LHCP-Yagyu.pdf
      • 276
        Search for new scalars (resonant HH production) and BSM Higgs decays
        Speaker: Diallo Boye (Brookhaven National Laboratory)
        LHCP2026_diallo_bis.pdf
    • 19:15
      Gala dinner Hôtel de Poulpry, Maison des polytechniciens

      Hôtel de Poulpry, Maison des polytechniciens

      12 Rue de Poitiers, 75007 Paris

      See https://indico.cern.ch/event/1537360/page/42715-gala-dinner for more details

  • Friday 22 May
    • Plenary Session: Heavy Ions and Top quark physics Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Convener: Federico Antinori (Universita e INFN, Padova (IT))
    • 10:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Parallel : Feebly interacting particles Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Aoife Bharucha, Arantza De Oyanguren Campos (Univ. of Valencia and CSIC (ES)), Benedikt Maier (Imperial College (GB)), Sukanya Sinha (The University of Manchester (GB))
      • 280
        Search for the Hidden Sector at SHIP
        Speaker: Mark Smith (Imperial College (GB))
        MarkSmith_LHCp.pdf
      • 281
        FIPs and other BSM phenomena in proposed small LHC experiements (CODEX-b, MATHUSLA, ANUBIS)
        Speaker: Valerii Kholoimov (EPFL - Ecole Polytechnique Federale Lausanne (CH))
        transverse_lhcp_talk_kholoimov_upd.pdf
      • 282
        Recent ATLAS results on long-lived particles
        Speaker: Yvonne Ng (Univ. Illinois at Urbana Champaign (US))
        Recent Long lived particle Searches.pdf
      • 283
        Recent CMS results on long-lived particles
        Speaker: Gael Coulon (Centre National de la Recherche Scientifique (FR))
        CMS_LHCP2026_GaelCOULON_f.pdf
      • 284
        Recent ATLAS+CMS results on long-lived particles (featuring similar detector region for LLP appearance)
        Speaker: Malgorzata Kazana (NCBJ Warsaw (PL))
        LLP_AtlasCMS_20260522.pdf
    • Parallel : Higgs Physics: Higgs rare production and decays Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Emanuele Di Marco (INFN, Roma 1 (IT)), Ezra Lesser (Los Alamos National Laboratory), Johannes Alf Braathen (DESY), Valentina Cairo (CERN)
      • 285
        Rare Higgs boson productions (bbH, c+H, etc) ATLAS+CMS

        15' presentation + 3' discussion - CMS speaker

        Speaker: Nicolo Lai (Universita e INFN, Padova (IT))
        LaiNicolo_HRareProd_LHCP2026_v2.pdf
      • 286
        Searches for rare and exotic decays of Higgs bosons at the LHC (ATLAS+CMS)

        Including BSM decays, invisible BR constraint, exclusive decays - ATLAS speaker (15' presentation + 3' discussion)

        Speaker: Egor Antipov (Stony Brook University (US))
        Searche_for_rare_and_exotic_decays_of_Higgs_bosons_at_the_LHC_ATLAS_CMS.pdf
      • 287
        State-of-the-art SM predictions + BSM (Theory)

        15' presentation + 3' discussion

        Speaker: Lisa Biermann
        lbiermann_lhcp26.pdf
      • 288
        Joker experimental talk (ATLAS results)

        15' presentation + 3' discussion - ATLAS speaker

        Speaker: Luc Tomas Le Pottier (University of California Berkeley (US))
        2026.05.22_ATLAS_tH_measurements_v7.pdf
      • 289
        Precise Higgs boson production

        15' presentation + 3' discussion

        Speaker: Matthias Steinhauser (KIT)
        steinhauser_lhcp.pdf
    • Parallel : TeV Scale and prompt signatures: Flavourful New Physics Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Arne Christoph Reimers (CERN), Daniel Hayden (Michigan State University (US)), Giacomo Cacciapaglia
    • Parallel Joint Session : QCD + Heavy Ions (in HION) Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Aleksas Mazeliauskas, Davide Zuliani (Universita e INFN, Padova (IT)), Fiorella Fionda (Universita e INFN, Cagliari (IT)), Jesse Liu (New York University), Jing Wang (Massachusetts Inst. of Technology (US)), Qipeng Hu (University of Science and Technology of China (CN)), Rene Poncelet (IFJ PAN Krakow), Thomas Boettcher (Indiana University (US))
      • 295
        Energy-energy correlators and Lund plane in ion collisions
        Speaker: Christopher Mc Ginn (Massachusetts Inst. of Technology (US))
        LHCP2026_HIEECAndLund_CMcGinn_20260522_vFinal.pdf
      • 296
        Theoretical overview of jet substructure in heavy ions
        Speaker: Carlota Andres (CPHT, Ecole polytechnique)
        LHCP2026.pdf
      • 297
        BSM searches in heavy-ion collisions at ATLAS
        Speaker: Weronika Stanek-Maslouska (Deutsches Elektronen-Synchrotron (DE))
        LHCP_BSM_in_UPC.pdf
      • 298
        Heavy-flavour fragmentation function at LHCb
        Speakers: Carlos Javier Barbero Pretel (Universidade de Santiago de Compostela (ES)), Carlos Javier Barbero Pretel (Universidade de Santiago de Compostela (ES))
        LHCP_HF_FFs.pdf
      • 299
        New results from LEP archived data in e+e- collisions
        Speaker: Jingyu Zhang (Vanderbilt University (US))
        260522-LHCP.pdf
    • Parallel Joint Session EFT Top+Higgs+EW+Flavor (in Top) Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Camilla Vittori (Universita e INFN, Bologna (IT)), Chiara Ilaria Rovelli (Sapienza Universita e INFN, Roma I (IT)), Conor Fitzpatrick (The University of Manchester (GB)), Emanuele Di Marco (INFN, Roma 1 (IT)), Ezra Lesser (Los Alamos National Laboratory), Johannes Alf Braathen (DESY), Mario Pelliccioni (Pavia University and INFN (IT)), Mathieu Pellen (University of Freiburg (DE)), Nedaa Alexandra Asbah (CERN), Sergio Sanchez Cruz (Universidad de Oviedo (ES)), Valentina Cairo (CERN), Yue Xu (University of Washington (US))
      • 300
        Theory developments in SMEFT

        15' presentation + 3' discussion

        Speaker: Konstantin Schmid (University and INFN Padova)
        LHCP_2026_Schmid.pdf
      • 301
        Global EFT Fits with focus on Higgs and di-Higgs results from ATLAS experiment

        15' presentation + 3' discussion

        Speaker: Betsy Cunnett (University of Sussex (GB))
        ATLASGlobalEFT_LHCP.pdf
      • 302
        Landscape talk THEO (U2 symmetry onto EFT)

        15' presentation + 3' discussion

        Speaker: Ajdin Palavric (IFIC Valencia)
        [LHCP2026] Ajdin Palavric.pdf
      • 303
        Global fits of the experimental data

        15' presentation + 3' discussion

        Speaker: Alfredo Glioti (INFN - Roma)
        GliotiLHCP.pdf
      • 304
        Global EFT Fits with focus on Higgs and di-Higgs results from CMS experiment

        15' presentation + 3' discussion

        Speaker: Giacomo Boldrini (CERN)
        LHCP_2026_PARIS_Boldrini (1).pdf
    • 12:30
      Lunch Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Outreach and diversity discussion Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris

      In same room as Outreach parallel session at 2pm

      Conveners: Dilia Maria Portillo Quintero (TRIUMF (CA)), Mary Richardson-Slipper (University of Cambridge (GB)), Tapan Nayak (CERN, Geneva and University of Houston)
    • Parallel : Feebly interacting particles Room 109

      Room 109

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Aoife Bharucha, Arantza De Oyanguren Campos (Univ. of Valencia and CSIC (ES)), Benedikt Maier (Imperial College (GB)), Sukanya Sinha (The University of Manchester (GB))
      • 305
        Theory overview on LLP searches at the LHC
        Speaker: Rebeca Beltrán (University of Cyprus)
        LLPtheory_Beltran_LHCP26.pdf
      • 306
        New Results on BSM Long-Lived Particle Searches with the FASER Experiment
        Speaker: Andrea Pizarro Medina
        LHCP_FASER_BSM_2026-05-22.pdf
      • 307
        Recent updates from SND
        Speaker: Ivaylo Dionisov (Sofia University St. Kliment Ohridski (BG))
        lhcp2026_recent_results_snd.pdf
      • 308
        Recent CMS results on heavy neutral leptons (including displaced signatures)
        Speakers: Jihun Kim (Seoul National University), Jihun Kim (Seoul National University), Jihun Kim (Seoul National University (KR))
        260522_Jihun_LHCP2026.pdf
      • 309
        Recent ATLAS results on heavy neutral leptons (including displaced signatures)
        Speaker: Margaret Lutz (University of Toronto (CA))
        ATLAS_HNLs.pdf
    • Parallel : Future Colliders/Detectors Room 108

      Room 108

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Francesca Carnesecchi (Universita e INFN, Bologna (IT)), Jan Eysermans (Massachusetts Inst. of Technology (US)), Philipp Roloff (CERN), Samuel Homiller (University of Pittsburgh), Simone Pagan Griso (Lawrence Berkeley National Lab. (US))
    • Parallel : Outreach Room 107

      Room 107

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Dilia Maria Portillo Quintero (TRIUMF (CA)), Mary Richardson-Slipper (University of Cambridge (GB)), Tapan Nayak (CERN, Geneva and University of Houston)
    • Parallel Joint Session: TeV scale and prompt signatures + Higgs (in BSM1): Extended scalar sector Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Arne Christoph Reimers (CERN), Daniel Hayden (Michigan State University (US)), Emanuele Di Marco (INFN, Roma 1 (IT)), Ezra Lesser (Los Alamos National Laboratory), Giacomo Cacciapaglia, Johannes Alf Braathen (DESY), Valentina Cairo (CERN)
      • 320
        Extended scalar sectors and Higgs pair production at the LHC
        Speaker: Kateryna Radchenko Serdula (DESY)
        LHCP_Radchenko.pdf
      • 321
        Recent CMS results on searches for resonant H+scalar production
        Speaker: Meng Lu (Northeastern University (US))
        LHCP_2026-1.pdf
      • 322
        Recent ATLAS results on searches for resonant H+scalar production
        Speaker: Tong Qiu (The University of Edinburgh (GB))
        LHCP2026lowmassresonance2.pdf
      • 323
        Recent CMS results on searches for additional scalars
        Speaker: Pallabi Das (CERN)
        LHCP_additional_scalar_searches_v3.pdf
      • 324
        Recent ATLAS results on searches for additional scalars
        Speaker: Luis Pascual Dominguez (Universidad Autonoma de Madrid (ES))
        LHCP2026_scalars_pascual.pdf
    • Parallel Session: Top Room 106

      Room 106

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Conveners: Ezra Lesser (Los Alamos National Laboratory), Nedaa Alexandra Asbah (CERN), Sergio Sanchez Cruz (Universidad de Oviedo (ES))
      • 325
        Searching for top-philic heavy resonances in boosted four-top final states
        Speaker: Luc DARME
        LHCP_DARME_pdf.pdf
      • 326
        Indirect searches for new physics in the top quark sector by CMS
        Speaker: Pruthvi Suryadevara (Tata Institute of Fundamental Research (IN))
        LHCP_Pruthvi_v2-3.pdf
      • 327
        Indirect searches for new physics in the top quark sector by ATLAS
        Speaker: Carlos Escobar Ibañez (Instituto de Física Corpuscular (IFIC), CSIC‐UV, Spain)
        Indirect searches - Carlos Escobar - LHCP2026.pdf
      • 328
        Searches for the violation of the flavor symmetries in the top quark sector by CMS
        Speaker: Giacomo Da Molin (Laboratory of Instrumentation and Experimental Particle Physics (PT))
        Flavour_in_top_GiacomoDaMolin-2.pdf
    • 15:30
      Coffee break Auditorium

      Auditorium

      CICSU

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
    • Plenary Session: Summaries and closing remarks Auditorium

      Auditorium

      Centre de conférences internationales - Sorbonne Université 4 Place Jussieu, 75005 Paris
      Convener: Wolfgang Adam (MBI-Vienna)