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...
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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Other Authors: | , , |
Format: | Article |
Language: | English |
Published: |
Elsevier,
2015-11-24T15:33:51Z.
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Subjects: | |
Online Access: | Get fulltext |
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. United States. Dept. of Energy National Science Foundation (U.S.) Alfred P. Sloan Foundation |
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