$\varphi$ and $\Omega$ production in relativistic heavy ion collisions in a dynamical quark coalescence model

Abstract

Based on the phase-space information obtained from a multi-phase transport model within the string melting scenario for strange and antistrange quarks, we study the yields and transverse momentum spectra of $\varphi$ mesons and $\Omega$ (${\Omega }^{-}+{\bar{\Omega }}^{+}$) baryons as well as their anisotropic flows in Au+Au collisions at RHIC using a dynamical quark coalescence model that includes the effect due to quark phase-space distributions inside hadrons. With current quark masses and fixing the $\varphi$ and $\Omega$ radii from fitting measured yields, we first study the ratio of the yield of $\Omega$ baryons to that of $\varphi$ mesons as well as their elliptic and fourth-order flows as functions of their transverse momentum. How the elliptic and fourth-order flows of $\varphi$ mesons and $\Omega$ baryons are related to those of strange and antistrange quarks is then examined. The dependence of above results on $\varphi$ and $\Omega$ radii as well as on the strange quark mass is also studied.

arXiv comment15 pages, 18 figures, Title changed, revised version to appear in PRC

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