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Non-Gaussian elliptic-flow fluctuations in PbPb collisions at √sNN = 5.02 TeV
Sirunyan, A.M. Sanders, Stephen J. The CMS Collaboration
Sirunyan, A.M.
Sanders, Stephen J.
The CMS Collaboration
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Abstract
Event-by-event fluctuations in the elliptic-flow coefficient v2 are studied in PbPb collisions at √sNN = 5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v2) for charged particles with transverse momentum 0.3 < pT < 3.0 GeV/c and pseudorapidity |η| < 1.0 are determined for different collision centrality classes. The moments of the p(v2) distributions are used to calculate the v2 coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v2) distributions indicate nonGaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
Date
2019-02-10
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Elsevier
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Sirunyan_2019.pdf
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Keywords
Event-by-event elliptic flow, Non-Gaussian flow fluctuations, Unfolding
Citation
A.M. Sirunyan et al., "Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV", Physics Letters B, Volume 789, 2019, Pages 643-665, ISSN 0370-2693, https://doi.org/10.1016/j.physletb.2018.11.063.
(http://www.sciencedirect.com/science/article/pii/S0370269318309924)