Modification of jet shapes in PbPb collisions at $sqrt s_NN = 2.76$ TeV

The CMS Collaboration (2014) Modification of jet shapes in PbPb collisions at $sqrt s_NN = 2.76$ TeV. Physics Letters B, B730, 243-263. (doi:10.1016/j.physletb.2014.01.042).

Record type: Article

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=2.76TeV 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>1GeV/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.

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