Centrality dependence of identified particle elliptic flow in relativistic heavy ion collisions at sNN=7.7–62.4 GeV

Le résumé fourni par la source

Elliptic flow $({v}_{2})$ values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at $\sqrt{{s}_{NN}}=7.7--62.4$ GeV are presented for three centrality classes. The centrality dependence and the data at $\sqrt{{s}_{NN}}=14.5$ GeV are new. Except at the lowest beam energies, we observe a similar relative ${v}_{2}$ baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger ${v}_{2}$ for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with a multiphase transport (AMPT) model and fit with a blast wave model.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.