Event-by-event fluctuations in the elliptic-flow coefficient v 2 are studied in PbPb collisions at s NN =5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v 2 ) for charged particles with transverse momentum 0.3<p T <3.0GeV/c and pseudorapidity |η|<1.0 are determined for different collision centrality classes. The moments of the p(v 2 ) distributions are used to calculate the v 2 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 2 ) 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.
Non-Gaussian elliptic-flow fluctuations in PbPb collisions at s NN =5.02TeV
Giannini, L.;Ligabue, F.;Mandorli, G.;Rolandi, G.;
2019
Abstract
Event-by-event fluctuations in the elliptic-flow coefficient v 2 are studied in PbPb collisions at s NN =5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v 2 ) for charged particles with transverse momentum 0.3
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