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Article
Report number arXiv:2312.03797 ; CERN-EP-2023-239
Title Measurement of jet substructure in boosted tt¯ events with the ATLAS detector using 140 fb1 of 13 TeV pp collisions
Author(s) ATLAS Collaboration  Mostrar todos los 2973 autores
Corporate Author(s) ATLAS Collaboration
Publication 2024-06-01
Imprint 06 Dec 2023
Number of pages 49
Note 71 pages in total, author list starting at page 54, 23 Figures, 3 tables, published as Phys. Rev. D 109 (2024) 112016. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2019-22
In: Phys. Rev. D 109 (2024) 112016
DOI 10.1103/PhysRevD.109.112016
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords QCD ; top physics ; experimental results ; substructure top quark decays
Abstract Measurements of the substructure of top-quark jets are presented, using 140 fb1 of 13 TeV pp collision data recorded with the ATLAS detector at the LHC. Top-quark jets reconstructed with the anti-kt algorithm with a radius parameter R=1.0 are selected in top-quark pair (tt¯) events where one top quark decays semileptonically and the other hadronically, or where both top quarks decay hadronically. The top-quark jets are required to have transverse momentum pT>350 GeV, yielding large samples of data events with jet pT values between 350 and 600 GeV. One- and two-dimensional differential cross-sections for eight substructure variables, defined using only the charged components of the jets, are measured in a particle-level phase space by correcting for the smearing and acceptance effects induced by the detector. The differential cross-sections are compared with the predictions of several Monte Carlo simulations in which top-quark pair-production quantum chromodynamic matrix-element calculations at next-to-leading-order precision in the strong coupling constant αS are passed to leading-order parton shower and hadronization generators. The Monte Carlo predictions for measures of the broadness, and also the two-body structure, of the top-quark jets are found to be in good agreement with the measurements, while variables sensitive to the three-body structure of the top-quark jets exhibit some tension with the measured distributions.
Related document supersedes: ATLAS-CONF-2023-027
Copyright/License Preprint: © 2023-2025 CERN (License: CC-BY-4.0)
Publication: © 2024-2025 CERN (License: CC BY 4.0), sponsored by SCOAP³



Corresponding record in: Inspire
Email contact: tatjana.lenz@cern.ch


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