Non-Gaussian Elliptic-Flow Fluctuations in PbPb Collisions at √sNN = 5.02 TeV

Physics Letters B 2019
Viesturs Veckalns, et al 100

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<3.0GeV/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 non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.

Keywords
Event-by-event elliptic flow, Non-Gaussian flow fluctuations, Unfolding
DOI
10.1016/j.physletb.2018.11.063
Hyperlink
https://www.sciencedirect.com/science/article/pii/S0370269318309924?via%3Dihub

Veckalns, V., 100, e. Non-Gaussian Elliptic-Flow Fluctuations in PbPb Collisions at √sNN = 5.02 TeV. Physics Letters B, 2019, Vol. 789, pp.643-665. ISSN 0370-2693. Available from: doi:10.1016/j.physletb.2018.11.063

Publication language
English (en)