Modification of jet shapes in PbPb collisions at sNN=2.76 TeV

doi:10.1016/j.physletb.2014.01.042

Title: Modification of jet shapes in PbPb collisions at s NN = 2.76 TeV

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.

Publication Date:: Sat Mar 01 00:00:00 EST 2014

Research Org.:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Org.:: CMS Collaboration

OSTI Identifier:: 1209789

Alternate Identifier(s):: OSTI ID: 1151672

Report Number(s):: FERMILAB-PUB-13-633-CMS; CERN-PH-EP-2013-189; CMS-HIN-12-002
Journal ID: ISSN 0370-2693; S0370269314000641; PII: S0370269314000641

Grant/Contract Number:: AC02-07CH11359

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Volume: 730; Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; High Energy Physics; HEP

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                    Modification of jet shapes in PbPb collisions at sNN=2.76 TeV.  Netherlands: N. p., 2014. 
Web.  doi:10.1016/j.physletb.2014.01.042.

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                    Modification of jet shapes in PbPb collisions at sNN=2.76 TeV.  Netherlands.  https://doi.org/10.1016/j.physletb.2014.01.042

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                    Sat .  
"Modification of jet shapes in PbPb collisions at sNN=2.76 TeV".  Netherlands.  https://doi.org/10.1016/j.physletb.2014.01.042.

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@article{osti_1209789,

  title        = {Modification of jet shapes in PbPb collisions at sNN=2.76 TeV},

  author       = {},

  abstractNote = {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.},

  doi          = {10.1016/j.physletb.2014.01.042},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 730,

  place        = {Netherlands},

  year         = {Sat Mar 01 00:00:00 EST 2014},

  month        = {Sat Mar 01 00:00:00 EST 2014}

}

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Cited by: 150 works

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Fig. 1: Differential jet shapes obtained from the jet cone before background subtraction (filled circles), and from the “$η$-reflected” background cone (open circles), as a function of the distance from the jet axis in two PbPb centrality intervals: 70–100% (left) and 0–10% (right). The measurements use inclusive jets with $p^{more »

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