Modification of jet shapes in PbPb collisions at √sNN = 2.76 TeV

CMS Collaboration

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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 μb−1 and 5.3 pb−1 respectively, were collected at a nucleon–nucleon centre-of-mass energy of √sNN = 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/c. 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.
Original languageEnglish
Pages (from-to)243-263
Number of pages21
JournalPhysics Letters B
Volume730
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • CMS
  • Heavy ion physics
  • Jet shapes

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