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.
|Number of pages||23|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2019 Feb 10|
- Event-by-event elliptic flow
- Non-Gaussian flow fluctuations
ASJC Scopus subject areas
- Nuclear and High Energy Physics