Non-Gaussian elliptic-flow fluctuations in PbPb collisions at √sNN = 5.02 TeV

• Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English; English
• Published: Elsevier B.V. 2019
• Subjects: Q Science (General); QC Physics
• Online Access: http://irep.iium.edu.my/71808/1/71808_Non-Gaussian%20elliptic-flow_article.pdf; http://irep.iium.edu.my/71808/2/71808_Non-Gaussian%20elliptic-flow_wos.pdf; http://irep.iium.edu.my/71808/3/71808_Non-Gaussian%20elliptic-flow_scopus.pdf; http://irep.iium.edu.my/71808/; https://reader.elsevier.com/reader/sd/pii/S0370269318309924?token=481B143F3605F004CBDC15F3C6BB0C113C6687DC4E58D6068BD9ADF20B6DADA1E945444EF85D514DA000B81B9F9265C7

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