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. © 2014 The Authors.
CITATION STYLE
Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., … Swanson, J. (2014). Modification of jet shapes in PbPb collisions at sNN=2.76TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 730, 243–263. https://doi.org/10.1016/j.physletb.2014.01.042
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