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Maria Hernandez Sanz7/13/26, 5:30 PMPoster
Hadronic object reconstruction & classification is one of the most promising settings for cutting-edge machine learning and artificial intelligence algorithms at the LHC. In this contribution, highlights of ML/AI applications by ATLAS to QCD and boosted-object identification, MET reconstruction and other tasks will be presented.
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Jennifer Roloff (Brown University (US))7/13/26, 5:30 PMPoster
The suppression of collinear gluon emissions from a massive quark, or the “dead- cone effect,” is the primary manifestation of quark mass effects in parton showers. A differential measurement is presented of the emission density of bottom quarks, studied as a function of the angular separation between the emissions from the same emitter. The measurement is performed in bottom quark-initiated...
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Dr Tousik Samui (The Institute of Mathematical Sciences)7/13/26, 5:30 PMPoster
Jets are among the most central objects in high-energy collider physics. While they appear as collimated sprays of hadrons, their internal structure carries detailed information about the initiating particle -- quark, gluon, or a heavy resonance. The dynamic radius algorithm [arXiv:2301.13074] was introduced to overcome the limitations of fixed-radius clustering by allowing the jet radius to...
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Congqiao Li (Peking University (CN))7/13/26, 5:30 PMPoster
We introduce the Global Particle Transformer (GloParT), a large-scale pretrained model developed within the CMS experiment for boosted-jet tasks. Initiated in mid-2022, GloParT is designed as a “foundation model” to support a wide range of tagging and regression applications. It is pretrained on jets from over 300 categories, learning a rich and generalizable representation of jet...
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Dr Gian Michele Innocenti (Massachusetts Inst. of Technology (US))7/13/26, 5:30 PMPoster
Heavy-quark production inside jets provides a sensitive probe of parton shower evolution and flavor creation in QCD. In particular, constraining $g \to c\bar{c}$ and $g \to b\bar{b}$ splittings in pp collisions is important both for understanding heavy-flavor production in vacuum and for establishing a reference for future studies in heavy ion collisions, where long-distance gluon splitting...
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Julia Leszczynska (Polish Academy of Sciences (PL))7/13/26, 5:30 PMPoster
Charged Higgs bosons are predicted in many extensions to the Standard Model and represent a direct signature of an extended Higgs sector. This talk presents the ATLAS Run 2 results of searches for charged Higgs bosons decaying to a tau lepton and a neutrino, using 140fb-1 of proton-proton collision data recorded at √s = 13 TeV. Depending on the charged Higgs boson mass, it is produced either...
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Peter Berta (Charles University, Prague (CZ))7/13/26, 5:30 PMPoster
Hard-scatter processes in hadronic collisions are often significantly contaminated by background contributions from pileup in proton-proton collisions or underlying event in heavy-ion collisions. It is crucial to mitigate this background since it has a significant impact on hadronic jet reconstruction and on the ability to identify the substructures of hadronically decaying boosted...
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Aritra Mandal (The State University of New York SUNY (US))7/13/26, 5:30 PMPoster
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Reinhard Schwienhorst (Michigan State University (US))7/13/26, 5:30 PMPoster
The precision and reach of physics analyses at the LHC is often tied to the performance of hadronic object reconstruction & calibration, with any incremental gains in understanding & reduced uncertainties being impactful on ATLAS results. Recent refinements to the reconstruction and calibration procedures for jets & missing energy by the ATLAS collaboration has resulted in reduced...
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Yi-Ren Wu (National Taiwan University (TW))7/13/26, 5:30 PMPoster
Precise reconstruction of event kinematics in the presence of invisible particles constitutes a fundamental underconstrained inference problem in particle physics. In processes such as dileptonic $t\bar{t}$ production, multiple undetected neutrinos lead to a multimodal solution space, where several kinematically consistent configurations can explain a single observed event.
We present a...
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Christos Leonidou (University of Cyprus (CY))7/13/26, 5:30 PM1Poster
The discovery of the 125 GeV Higgs boson opened a new era in the search for heavy resonances at the LHC. Many BSM scenarios, such as 2HDM, 2HDM+S, TRSM, and NMSSM, predict extended scalar sectors with additional Higgs-like states. These models often produce final states with high-pT Higgs bosons, requiring advanced jet-tagging techniques. This talk presents the latest searches from the CMS...
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Adam Albert Kobert (Rutgers State Univ. of New Jersey (US))7/13/26, 5:30 PMPoster
A search for low-mass resonances decaying into a quark-antiquark pair in the mass range of 10 to 150 GeV is presented. This search uses data from the LHC in proton-proton collisions at √s = 13 TeV, collected by the CMS detector at the CERN LHC in 2016–2018, corresponding to an integrated luminosity of 138 fb−1. The analysis strategy makes use of an initial state photon recoiling against the...
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Haifa Rejeb Sfar (The State University of New York SUNY (US))7/13/26, 5:30 PMPoster
A search for new particles decaying to top quark-antiquark pairs is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV. The data set recorded with the CMS detector between 2016 and 2018 is used, corresponding to an integrated luminosity of 138 fb − 1 −1 . Final states with 0, 1, and 2 leptons are analyzed, covering all decay modes of the top quark-antiquark...
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Xinyue Geng (Peking University (CN))7/13/26, 5:30 PMPoster
A search for nonresonant triple Higgs boson production in the six b quark final state is performed using proton-proton collisions at √s = 13 TeV corresponding to an integrated luminosity of 138 fb−1 recorded by the CMS experiment. Each Higgs boson is reconstructed either from two small-radius jets (resolved) or a single large-radius jet (merged). No significant excess of events over the...
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Petar Maksimovic (Johns Hopkins University (US))7/13/26, 5:30 PMPoster
Vector-Like Quarks (VLQs) are a central feature of many BSM scenarios, including Composite Higgs and Extra-Dimensional models. These heavy fermions offer a natural solution to the hierarchy problem and provide a framework for understanding the Standard Model flavor structure. Unlike chiral fourth-generation quarks, VLQs are consistent with current Higgs boson measurements as their masses are...
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Amartya Rej (Technische Universitaet Dortmund (DE))7/13/26, 5:30 PMPoster
W and Z boson polarization is a direct probe of electroweak symmetry breaking, as the longitudinal states are physical remnants of the Higgs mechanism and their production fraction is uniquely sensitive to anomalous gauge couplings and new physics.
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While leptonic decay channels of W/Z provide clean polarization measurements through the lepton angular distribution, they suffer from limited...
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