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Article
Report number arXiv:2105.04936 ; CERN-EP-2021-082
Title First measurements of N-subjettiness in central Pb-Pb collisions at sNN=2.76 TeV
Author(s) ALICE Collaboration  Zeige alle 1035 Autoren
Corporate author(s) The ALICE collaboration
Publication 2021-10-01
Imprint 06 May 2021
Number of pages 34
Note figures at http://alice-publications.web.cern.ch/node/7072
Published in: JHEP 2110 (2021) 003
DOI 10.1007/JHEP10(2021)003
Subject category Nuclear Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords QCD ; relativistic heavy ion physics ; quark gluon plasma ; hard scattering ; jet physics ; experimental results
Abstract The ALICE Collaboration reports the first fully-corrected measurements of the N-subjettiness observable for track-based jets in heavy-ion collisions. This study is performed using data recorded in pp and PbPb collisions at centre-of-mass energies of s=7 TeV and sNN=2.76 TeV, respectively. In particular the ratio of 2-subjettiness to 1-subjettiness, τ2/τ1, which is sensitive to the rate of two-pronged jet substructure, is presented. Energy loss of jets traversing the strongly interacting medium in heavy-ion collisions is expected to change the rate of two-pronged substructure relative to vacuum. The results are presented for jets with a resolution parameter of R=0.4 and charged jet transverse momentum of 40pT,jet60 GeV/c, which constitute a larger jet resolution and lower jet transverse momentum interval than previous measurements in heavy-ion collisions. This has been achieved by utilising a semi-inclusive hadron-jet coincidence technique to suppress the larger jet combinatorial background in this kinematic region. No significant modification of the τ2/τ1 observable for track-based jets in PbPb collisions is observed relative to vacuum PYTHIA6 and PYTHIA8 references at the same collision energy. The measurements of τ2/τ1, together with the splitting aperture angle ΔR, are also performed in pp collisions at s=7 TeV for inclusive jets. These results are compared with PYTHIA calculations at s=7 TeV, in order to validate the model as a vacuum reference for the PbPb centre-of-mass energy. The PYTHIA references for τ2/τ1 are shifted to larger values compared to the measurement in pp collisions. This hints at a reduction in the rate of two-pronged jets in PbPb collisions compared to pp collisions.
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Copyright/License publication: © 2021-2024 CERN (License: CC-BY-4.0), sponsored by SCOAP³
preprint: © 2021-2024 CERN (License: CC-BY-4.0)
Submitted by javier.castillo.castellanos@cern.ch



 


 Datensatz erzeugt am 2021-05-06, letzte Änderung am 2024-11-27


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