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Article
Report number arXiv:2211.11470 ; CERN-EP-2022-182
Title Measurement of substructure-dependent jet suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  Mostra tots els 2955 autors
Corporate Author(s) ATLAS Collaboration
Publication 2023-05-12
Imprint 21 Nov 2022
Number of pages 32
Note All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2021-09/
In: Phys. Rev. C 107 (2023) 054909
DOI 10.1103/PhysRevC.107.054909 (publication)
Subject category Nuclear Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords QCD ; relativistic heavy ion physics ; quark gluon plasma ; experimental results ; jet substructure
Abstract The ATLAS detector at the Large Hadron Collider has been used to measure jet substructure modification and suppression in Pb+Pb collisions at a nucleon-nucleon center-of-mass energy sNN=5.02TeV in comparison with pp collisions at s=5.02TeV. The Pb+Pb data, collected in 2018, have an integrated luminosity of 1.72nb1, while the pp data, collected in 2017, have an integrated luminosity of 260pb1. Jets used in this analysis are clustered using the anti-kt algorithm with a radius parameter R=0.4. The jet constituents, defined by both tracking and calorimeter information, are used to determine the angular scale rg of the first hard splitting inside the jet by reclustering them using the Cambridge-Aachen algorithm and employing the soft-drop grooming technique. The nuclear modification factor, RAA, used to characterize jet suppression in Pb+Pb collisions, is presented differentially in rg, jet transverse momentum, and in intervals of collision centrality. The RAA value is observed to depend significantly on jet rg. Jets produced with the largest measured rg are found to be twice as suppressed as those with the smallest rg in central Pb+Pb collisions. The RAA values do not exhibit a strong variation with jet pT in any of the rg intervals. The rg and pT dependence of jet RAA is qualitatively consistent with a picture of jet quenching arising from coherence and provides the most direct evidence in support of this approach.
Related document supersedes: ATLAS-CONF-2022-026
Copyright/License Publication: © 2023-2025 CERN (License: CC-BY-4.0)
Preprint: © 2022-2025 CERN (License: CC-BY-4.0)



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


 Registre creat el 2022-11-21, darrera modificació el 2025-01-31


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