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Article
Report number arXiv:2407.18796 ; CERN-EP-2024-196
Title Jet radius dependence of dijet momentum balance and suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  ყველა 2979 ავტორის ჩვენება
Corporate Author(s) ATLAS Collaboration
Publication 2024-11-25
Imprint 26 Jul 2024
Number of pages 59
Note 59 pages in total, author list starting page 42, 21 figures, 1 table, published by PRC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2024-03/
In: Phys. Rev. C 110 (2024) 054912
DOI 10.1103/PhysRevC.110.054912 (publication)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords quark gluon plasma ; jet physics ; experimental results ; jet quenching
Abstract This paper describes a measurement of the jet radius dependence of the dijet momentum balance between leading back-to-back jets in 1.72 nb1 of Pb+Pb collisions collected in 2018 and 255 pb1 of pp collisions collected in 2017 by the ATLAS detector at the LHC. Both data sets were collected at sNN= 5.02 TeV. Jets are reconstructed using the anti-kt algorithm with jet radius parameters R= 0.2, 0.3, 0.4, 0.5 and 0.6. The dijet momentum balance distributions are constructed for leading jets with transverse momentum pT from 100 to 562 GeV for R= 0.2, 0.3 and 0.4 jets, and from 158 to 562 GeV for R= 0.5 and 0.6 jets. The absolutely normalized dijet momentum balance distributions are constructed to compare measurements of the dijet yields in Pb+Pb collisions directly to the dijet cross sections in pp collisions. For all jet radii considered here, there is a suppression of more balanced dijets in Pb+Pb collisions compared to pp collisions, while for more imbalanced dijets there is an enhancement. There is a jet radius dependence to the dijet yields, being stronger for more imbalanced dijets than for more balanced dijets. Additionally, jet pair nuclear modification factors are measured. The subleading jet yields are found to be more suppressed than leading jet yields in dijets. A jet radius dependence of the pair nuclear modification factors is observed, with the suppression decreasing with increasing jet radius. These measurements provide new constraints on jet quenching scenarios in the quark-gluon plasma.
Related document supersedes: ATLAS-CONF-2023-060
Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)



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


 ჩანაწერი შექმნილია 2024-07-26, ბოლოს შესწორებულია 2024-12-21


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