Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV in PbPb collisions at sqrt(s[NN]) = 5.02 TeV - Archive ouverte HAL Access content directly
Journal Articles Physics Letters B Year : 2017

Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV in PbPb collisions at sqrt(s[NN]) = 5.02 TeV

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A.M. Sirunyan
  • Function : Author
S. Baffioni
P. Busson
R. Granier De Cassagnac
P. Paganini
N. Chanon
C. Collard
D. Contardo
M. Gouzevitch
Fabienne Lagarde
M. Lethuillier
A. Popov
  • Function : Author
V. Sordini
S. Viret

Abstract

The Fourier coefficients v[2] and v[3] characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at sqrt(s[NN])= 5.02 TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, pt= 1-100 GeV. The analysis focuses on pt > 10 GeV 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 60x% most central events. The v[2] coefficient is measured with the scalar product and the multiparticle cumulant methods, which have different sensitivities to the initial-state fluctuations. The values of both methods remain positive up to pt ~ 70 GeV, in all examined centrality classes. The v[3] coefficient, only measured with the scalar product method, tends to zero for pt >~ 20 GeV. 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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Dates and versions

in2p3-01454724 , version 1 (14-12-2018)

Identifiers

Cite

A.M. Sirunyan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV in PbPb collisions at sqrt(s[NN]) = 5.02 TeV. Physics Letters B, 2017, 776, pp.195. ⟨10.1016/j.physletb.2017.11.041⟩. ⟨in2p3-01454724⟩
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