Elliptic flow of $\varphi$ meson and strange quark collectivity at RHIC

Abstract

Based on A Multi-Phase Transport (AMPT) model, we have studied the elliptic flow $v_2$ of $\varphi$ mesons from reconstructed $K^{+}{K}^{-}$ decay channel at the top Relativistic Heavy Ion Collider energy at Brookhaven National Laboratory. The dependences of $v_2$ on transverse momentum $p_T$ and collision centrality are presented and the rescattering effect of $\varphi$ mesons in the hadronic phase is also investigated. The results show that experimental measurement of $v_2$ for $\varphi$ mesons can retain the early collision information before $\varphi$ decays and that the $\varphi$ $v_2$ value obeys the constituent quark number scaling which has been observed for other mesons and baryons. Our study indicates that the $\varphi$ $v_2$ mostly reflects partonic level collectivity developed during the early stage of the nucleus-nucleus collision and the strange and light up/down quarks have developed similar angular anistropy properties at the hadronization.

5 pages and 5 figures; accepted by Physical Review C

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