Non-Gaussian elliptic-flow fluctuations in PbPb collisions at s NN =5.02TeV

The CMS Collaboration, cms-publication-committee-chair@cern.ch

Research output: Contribution to journalArticle

11 Citations (Scopus)

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 languageEnglish
Pages (from-to)643-665
Number of pages23
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume789
DOIs
Publication statusPublished - 2019 Feb 10

Keywords

  • Event-by-event elliptic flow
  • Non-Gaussian flow fluctuations
  • Unfolding

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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