Modification of jet shapes in PbPb collisions at sqrt(s[NN]) = 2.76 TeV - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physics Letters B Year : 2014

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

S. Chatrchyan
  • Function : Author
P. Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
J.-L. Agram
C. Collard
E. Conte
P. van Hove
D. Contardo
M. Gouzevitch
M. Lethuillier
V. Sordini
P. Verdier
S. Viret

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.

Dates and versions

in2p3-00873028 , version 1 (15-10-2013)

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Cite

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, 2014, 730, pp.243-263. ⟨10.1016/j.physletb.2014.01.042⟩. ⟨in2p3-00873028⟩
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