## 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<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.

Original language | English |
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Pages (from-to) | 643-665 |

Number of pages | 23 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 789 |

DOIs | |

Publication status | Published - 10 Feb 2019 |

## Keywords

- Event-by-event elliptic flow
- Non-Gaussian flow fluctuations
- Unfolding
- PERSPECTIVE
- QUARK-GLUON PLASMA
- NUCLEAR COLLISIONS
- VISCOSITY
- PARTICLE-PRODUCTION
- ANISOTROPY