Skewness of the elliptic flow distribution in sNN =5.02 TeV PbPb collisions from the HYDJET++ model

Abstract

The elliptic flow (v2) event-by-event fluctuations in PbPb collisions at 5.02 TeV are analyzed within the HYDJET++ model. Using the multiparticle, so-called Q-cumulant method, v2{2}, v2{4}, v2{6}, and v2{8} are calculated and used to study their ratios and to construct skewness (γ1exp) as a measure of the asymmetry of the elliptic flow distribution. Additionally, in order to check if there is a hydrodynamics nature in the elliptic collectivity generated by the HYDJET++ model, the ratio of v2{6}-v2{8} and v2{4}-v2{6} distributions is calculated. The analysis is performed as a function of the collision centrality. In order to check the HYDJET++ model responses, the results of this analysis are compared to the corresponding experimental measurements from the ALICE, ATLAS, and CMS experiments. A rather good qualitative agreement is found.