Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at √SNN = 5.02TeV
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Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
November 2017
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Sirunyan, A. M., et al. “Azimuthal Anisotropy of Charged Particles with Transverse Momentum up to 100 GeV/ c in PbPb Collisions at √sNN = 5.02 TeV.” Physics Letters B, vol. 776, Jan. 2018, pp. 195–216. © 2017 The Authors
Version
Final published version
Abstract
The Fourier coefficients v[subscript 2] and v[subscript 3] characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at √sNN =5.02 TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1 < p[subscript T] < 100 GeV/c. The analysis focuses on the p[subscript T] > 10 GeV/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 v[subscript 2] 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 p[subscript T] ∼60–80 GeV/c, in all examined centrality classes. The v[subscript 3] coefficient, only measured with the scalar product method, tends to zero for p[subscript T] ≳20 GeV/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. Keywords: CMS, QGP, High-pT, Flow, Parton energy loss,
Jet quenching
Jet quenching
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2017.11.041
