Event anisotropy $v_{2}$ at STAR

TL;DR

This paper analyzes elliptic flow ($v_{2}$) in heavy ion collisions at 200 GeV, examining particle behavior, quark scaling, and comparisons with hydrodynamic models to understand collision dynamics.

Contribution

It provides a systematic analysis of $v_{2}$ for identified particles in different collision systems and tests quark scaling in various conditions.

Findings

Quark scaling holds in intermediate $p_{T}$ region.

Cu + Cu results are consistent with ideal hydrodynamic models.

Elliptic flow reflects early collision dynamics.

Abstract

Collective flow reflects the dynamical evolution in high-energy heavy ion collisions. In particular, the elliptic flow reflects early collision dynamics.We present a systematic analysis of elliptic flow ($v_{2}$) for identified particles measured in Au + Au and Cu + Cu collisions at $\sqrt{s_{NN}}$ = 200 GeV. Number of quark scaling is tested in the intermediate $p_{T}$ region and in the smaller system (Cu + Cu). The Cu + Cu collisions results are compared with those from ideal hydrodynamic model calculations.