Modification of Jet Shapes in PbPb Collisions at √s[subscript NN] = 2.76 TeV
Author(s)Apyan, Aram; Bauer, Gerry P.; Busza, Wit; Cali, Ivan Amos; Chan, Matthew Hans; Di Matteo, Leonardo; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Kim, Y.; Klute, Markus; Lai, Yue Shi; Levin, Andrew Michael; Luckey, P. David, Jr.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C.; Velicanu, Dragos Alexandru; Wolf, Roger; Wyslouch, Boleslaw; Yang, Mingming; Yilmaz, Yetkin; Yoon, Sungho; Zanetti, Marco; Zhukova, Victoria; ... Show more Show less
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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[superscript −1] and 5.3 pb[superscript −1] respectively, were collected at a nucleon–nucleon centre-of-mass energy of √s[subscript 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 p[subscript T] > 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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Physics Letters B
CMS Collaboration. “Modification of Jet Shapes in PbPb Collisions at √s[subscript NN] = 2.76 TeV.” Physics Letters B 730 (March 2014): 243–263.
Final published version