Higher-order moments of the elliptic flow distribution in PbPb collisions at √sNN = 5.02 TeV

(CMS Collaboration) Giljanović, Duje; Godinović, Nikola; Lelas, Damir; Puljak, Ivica; Antunović, Željko; Kovač, Marko; Šćulac, Toni; Brigljević, Vuko; Chitroda, Bhakti Kanulal; Ferenček, Dinko; Mishra, Saswat; Roguljić, Matej; Starodumov, Andrey; Šuša, Tatjana; Bargassa, Pedrame; Đurić, Senka (2024) Higher-order moments of the elliptic flow distribution in PbPb collisions at √sNN = 5.02 TeV. The Journal of high energy physics, 2024 . ISSN 1126-6708

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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, v(2){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 root s(NN) = 5.02TeV. 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 v(2){2} > v(2){4} greater than or similar to v(2){6} greater than or similar to v(2){8} greater than or similar to v(2){10}. Based on these results, centrality-dependent moments for the fluctuation-driven event-by-event v(2) 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.

Item Type:	Article
Uncontrolled Keywords:	High energy physics ; Experimental particle physics ; LHC ; CMS ; Event-by-Event fluctuation ; Harmonic Flow ; Heavy Ion Experiments ; Relativistic Heavy Ion Physics ; expansion: hydrodynamics ; nucleus nucleus: scattering ; elliptic flow ; initial state ; hierarchy ; anisotropy ; correlation ; higher-order ; CERN LHC Coll ; hadron ; experimental results ; 5020 GeV-cms/nucleon
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Centre for detectors, sensors and electronics Division of Experimental Physics
Depositing User:	Lorena Palameta
Date Deposited:	07 Oct 2024 13:28
URI:	http://fulir.irb.hr/id/eprint/9118
DOI:	10.1007/JHEP02(2024)106

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