Elliptic flow of $ϕ$ meson and strange quark collectivity at RHIC

Chen, J. H.; Ma, Y. G.; Ma, G. L.; Cai, X. Z.; He, Z. J.; Huang, H. Z.; Long, J. L.; Shen, W. Q.; Zhong, C.; Zuo, J. X.

Elliptic flow of $ϕ$ meson and strange quark collectivity at RHIC

Authors

Description

Based on A Multi-Phase Transport (AMPT) model, we have studied the elliptic flow $v_{2}$ of $ϕ$ 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 $ϕ$ mesons in the hadronic phase is also investigated. The results show that experimental measurement of $v_{2}$ for $ϕ$ mesons can retain the early collision information before $ϕ$ decays and that the $ϕ$ $v_2$ value obeys the constituent quark number scaling which has been observed for other mesons and baryons. Our study indicates that the $ϕ$ $v_2$ 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