Higher-Order Moments of the Elliptic Flow Distribution in PbPb Collisions at √sNN = 5.02 TeV
Journal of High Energy Physics 2024
Kārlis Dreimanis, Guntis Pikurs, Andris Potrebko, Markus Seidel, Viesturs Veckalns, CMS Collaboration

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.


Atslēgas vārdi
Event-by-Event fluctuation | Harmonic Flow | Heavy Ion Experiments | Relativistic Heavy Ion Physics
DOI
10.1007/JHEP02(2024)106
Hipersaite
https://link.springer.com/article/10.1007/JHEP02(2024)106

The CMS Collaboration, A.Tumasyan, K.Dreimanis, G.Pikurs, A.Potrebko, M.Seidel, V.Veckalns ... [et al.]. Higher-Order Moments of the Elliptic Flow Distribution in PbPb Collisions at √sNN = 5.02 TeV. Journal of High Energy Physics, 2024, Vol. 2024, No. 2, Article number 106. e-ISSN 1029-8479. Pieejams: doi:10.1007/JHEP02(2024)106

Publikācijas valoda
English (en)
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