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Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at √sNN = 5.02 TeV

Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at √sNN = 5.02 TeV
Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at √sNN = 5.02 TeV
The Fourier coefficients v2 and v3 characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at sNN=5.02TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1<pT<100GeV/c. The analysis focuses on the pT>10GeV/c range, where anisotropic azimuthal distributions should reflect the path-length dependence of parton energy loss in the created medium. Results are presented in several bins of PbPb collision centrality, spanning the 60% most central events. The v2 coefficient is measured with the scalar product and the multiparticle cumulant methods, which have different sensitivities to initial-state fluctuations. The values from both methods remain positive up to pT∼60–80GeV/c, in all examined centrality classes. The v3 coefficient, only measured with the scalar product method, tends to zero for pT≳20GeV/c. Comparisons between theoretical calculations and data provide new constraints on the path-length dependence of parton energy loss in heavy ion collisions and highlight the importance of the initial-state fluctuations.
0370-2693
195-216
Belyaev, A.
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Belyaev, A.
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Belyaev, A. , The CMS Collaboration (2018) Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at √sNN = 5.02 TeV. Physics Letters B, 776, 195-216. (doi:10.1016/j.physletb.2017.11.041).

Record type: Article

Abstract

The Fourier coefficients v2 and v3 characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at sNN=5.02TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1<pT<100GeV/c. The analysis focuses on the pT>10GeV/c range, where anisotropic azimuthal distributions should reflect the path-length dependence of parton energy loss in the created medium. Results are presented in several bins of PbPb collision centrality, spanning the 60% most central events. The v2 coefficient is measured with the scalar product and the multiparticle cumulant methods, which have different sensitivities to initial-state fluctuations. The values from both methods remain positive up to pT∼60–80GeV/c, in all examined centrality classes. The v3 coefficient, only measured with the scalar product method, tends to zero for pT≳20GeV/c. Comparisons between theoretical calculations and data provide new constraints on the path-length dependence of parton energy loss in heavy ion collisions and highlight the importance of the initial-state fluctuations.

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Accepted/In Press date: 18 November 2017
e-pub ahead of print date: 24 November 2017
Published date: 10 January 2018

Identifiers

Local EPrints ID: 417524
URI: https://eprints.soton.ac.uk/id/eprint/417524
ISSN: 0370-2693
PURE UUID: 80e52a09-ba21-4620-8d64-96fbc491d773
ORCID for A. Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 02 Feb 2018 17:30
Last modified: 02 Feb 2018 17:30

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Author: A. Belyaev ORCID iD

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