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Non-Gaussian elliptic-flow fluctuations in PbPb collisions at √ s NN = 5.02 TeV
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Event-by-event fluctuations in the elliptic-flow coefficient v are studied in PbPb collisions at s =5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v ) for charged particles with transverse momentum 0.3<p <3.0GeV/c and pseudorapidity |η|<1.0 are determined for different collision centrality classes. The moments of the p(v ) distributions are used to calculate the v 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(v ) distributions indicate non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy. 2 NN 2 T 2 2 2
Date issued
2019Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher
Elsevier BV