Strange quark collectivity of φ meson at RHIC

Based on AMPT model, the elliptic flow v2 of φ mesons which is reconstructed from KK at the Relativistic Heavy Ion Collider (RHIC) energy has been studied. The results show that reconstructed v2 of φmeson can keep the earlier information before φ decays and it seems to obey the number of constituent quark scaling as other mesons and baryons. This result indicates that the φ v2 mostly reflects the parton level collectivity developed during the early stage of the collisions and the strange and light up/down quarks have similar azimuthal angular anisotropy properties at the hadronization.