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Preprint
Report number arXiv:2411.03106 ; CERN-EP-2024-283
Title Medium-induced modification of groomed and ungroomed jet mass and angularities in Pb-Pb 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.) 1065 人のオーサーを表示
Corporate author(s) The ALICE collaboration
Publication 2024
Collaboration ALICE
Imprint 25 Oct 2024
Number of pages 20
Note 20 pages, 3 captioned figures, authors from page 14, submitted to PLB, figures at http://alice-publications.web.cern.ch/node/11715
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords relativistic heavy ion physics ; quark gluon plasma ; hard scattering ; jet physics ; experimental results
Abstract The ALICE Collaboration presents a new suite of jet substructure measurements in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair sNN=5.02 TeV. These measurements provide access to the internal structure of jets via the momentum and angle of their constituents, probing how the quark--gluon plasma modifies jets, an effect known as jet quenching. Jet grooming additionally removes soft wide-angle radiation to enhance perturbative accuracy and reduce experimental uncertainties. We report the groomed and ungroomed jet mass mjet and jet angularities λακ using κ=1 and α>0. Charged-particle jets are reconstructed at midrapidity using the anti-kT algorithm with resolution parameter R=0.2. A narrowing of the jet mass and angularity distributions in Pb-Pb collisions with respect to pp is observed and is enhanced for groomed results, confirming modification of the jet core. By using consistent jet definitions and kinematic cuts between the mass and angularities for the first time, previous inconsistencies in the interpretation of quenching measurements are resolved, rectifying a hurdle for understanding how jet quenching arises from first principles and highlighting the importance of a well-controlled baseline. These results are compared with a variety of theoretical models of jet quenching, providing constraints on jet energy-loss mechanisms in the quark-gluon plasma.
Other source Inspire
Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)
Submitted by francesco.prino@cern.ch



 


 レコード 生成: 2024-10-25, 最終変更: 2025-01-06


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