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Preprint
Report number arXiv:2409.12837 ; CERN-EP-2024-238
Title Search for quasi-particle scattering in the quarkgluon plasma with jet splittings in pp and PbPb collisions at sNN = 5.02 TeV
Author(s) Acharya, Shreyasi (Clermont-Ferrand U.) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) Afficher les 1080 auteurs
Corporate author(s) The ALICE collaboration
Publication 2024
Imprint 11 Sep 2024
Number of pages 26
Note 26 pages, 4 captioned figures, 2 tables, authors from page 20, submitted to PRL, figures at http://alice-publications.web.cern.ch/node/11331
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords QCD ; relativistic heavy ion physics ; quark gluon plasma ; hard scattering ; experimental results
Abstract The ALICE Collaboration reports measurements of the large relative transverse momentum (kT) component of jet substructure in pp and in central and semicentral PbPb collisions at center-of-mass energy per nucleon pair sNN=5.02 TeV. Enhancement in the yield of such large-kT emissions in central PbPb collisions is predicted to arise from partonic scattering with quasi-particles of the quarkgluon plasma. The analysis utilizes charged-particle jets reconstructed by the anti-kT algorithm with resolution parameter R=0.2 in the transverse-momentum interval 60<pT,ch jet<80 GeV/c. The soft drop and dynamical grooming algorithms are used to identify high transverse momentum splittings in the jet shower. Comparison of measurements in PbPb and pp collisions shows medium-induced narrowing, corresponding to yield suppression of high-kT splittings, in contrast to the expectation of yield enhancement due to quasi-particle scattering. The measurements are compared to theoretical model calculations incorporating jet quenching, both with and without quasi-particle scattering effects. These measurements provide new insight into the underlying mechanisms and theoretical modeling of jet quenching.
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Copyright/License Preprint: © 2024 CERN (License: CC-BY-4.0)
Submitted by francesco.prino@cern.ch



 


 Notice créée le 2024-09-11, modifiée le 2024-11-27


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