학술논문
Higher-order moments of the elliptic flow distribution in PbPb collisions at sNN = 5.02 TeV
Document Type
Original Paper
Author
Source
Journal of High Energy Physics. 2024(2)
Subject
Language
English
ISSN
1029-8479
Abstract
Abstract: The hydrodynamic flow-like behavior of charged hadrons in high-energy lead-lead collisions is studied through multiparticle correlations. The elliptic anisotropy values based on different orders of multiparticle cumulants, v2 {2k}, are measured up to the tenth order (k = 5) as functions of the collision centrality at a nucleon-nucleon center-of-mass energy of sNN = 5.02 TeV. The data were recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 0.607 nb−1 . A hierarchy is observed between the coefficients, with v2 {2} > v2 {4} ≳ v2 {6} ≳ v2 {8} ≳ v2 {10}. Based on these results, centrality-dependent moments for the fluctuation-driven event-by-event v2 distribution are determined, including the skewness, kurtosis and, for the first time, superskewness. Assuming a hydrodynamic expansion of the produced medium, these moments directly probe the initial-state geometry in high-energy nucleus-nucleus collisions.