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Modification of jet shapes in PbPb collisions at sqrt(s[NN]) = 2.76 TeV

Abstract : The first measurement of jet shapes, defined as the fractional transverse momentum radial distribution, for inclusive jets produced in heavy-ion collisions is presented. Data samples of PbPb and pp collisions, corresponding to integrated luminosities of 150 inverse microbarns and 5.3 inverse picobarns respectively, were collected at a nucleon-nucleon centre-of-mass energy of sqrt(s[NN]) = 2.76 TeV with the CMS detector at the LHC. The jets are reconstructed with the anti-kt algorithm with a distance parameter R=0.3, and the jet shapes are measured for charged particles with transverse momentum pt> 1 GeV. The jet shapes measured in PbPb collisions in different collision centralities are compared to reference distributions based on the pp data. A centrality-dependent modification of the jet shapes is observed in the more central PbPb collisions, indicating a redistribution of the energy inside the jet cone. This measurement provides information about the parton shower mechanism in the hot and dense medium produced in heavy-ion collisions.
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Contributor : Sylvie Flores <>
Submitted on : Tuesday, October 15, 2013 - 7:52:32 AM
Last modification on : Wednesday, May 5, 2021 - 12:44:21 PM

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S. Chatrchyan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Modification of jet shapes in PbPb collisions at sqrt(s[NN]) = 2.76 TeV. Physics Letters B, Elsevier, 2014, 730, pp.243-263. ⟨10.1016/j.physletb.2014.01.042⟩. ⟨in2p3-00873028⟩