The elliptic flow ($v_{ 2}$) event-by-event fluctuations in PbPb collisions at 5.02~TeV are analyzed within the HYDJET++ model. Using the multi-particle, so called Q-cumulant method, $v_{ 2}\{ 2\}$, $v_{ 2}\{ 4\}$, $v_{ 2}\{ 6\}$ and $v_{ 2}\{ 8\}$ are calculated and used to study their ratios and to construct skewness ($\gamma^{ exp}_{ 1}$) 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 $v_{ 2}\{ 6\} - v_{ 2}\{ 8\}$ and $v_{ 2}\{ 4\} - v_{ 2}\{ 6\}$ distribution 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 by CMS. A good qualitative and rather good quantitative agreement is found.
Categories: hep-ph nucl-th