Modification of Jet Shapes in PbPb Collisions at √s[subscript NN] = 2.76 TeV

Modification of Jet Shapes in PbPb Collisions at √s[subscript NN] = 2.76 TeV

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...

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Bibliographic Details
Main Authors: Apyan, Aram, Busza, Wit, Cali, Ivan Amos, Di Matteo, Leonardo, Dutta, Valentina, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Kim, Y., Klute, Markus, Lai, Yue Shi, Levin, Andrew Michael, Ma, Teng, Nahn, Steven, Paus, Christoph M. E., Ralph, Duncan Kelley, Stephans, George S. F., Velicanu, Dragos Alexandru, Wolf, Roger, Wyslouch, Boleslaw, Yang, Mingming, Yilmaz, Yetkin, Zanetti, Marco, Roland, Christof E, Roland, Gunther M, Stoeckli, Fabian, Sumorok, Konstanty C, Yoon, A. S., Wyslouch, Victoria, Bauer, Gerry P, Chan, M., Luckey Jr, P David
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Published: Elsevier 2015
Online Access:http://hdl.handle.net/1721.1/100027
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0002-1136-6900
Description
Summary: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.

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