The elliptic flow of multi-strange hadrons in sNN=200GeV Au + Au collisions at STAR

The measurement of the elliptic flow, v2, provides a powerful tool for studying the properties of hot and dense medium created in high-energy nuclear collisions. We present the measurement of v2 of multi-strange hadrons (ϕ, Ξ and Ω) in sNN=200GeV Au + Au collisions at STAR. In minimum-bias Au + Au collisions at sNN=200GeV, a significant amount of elliptic flow, almost identical to other mesons and baryons, is observed for multi-strange hadrons. Experimental observations of pT dependence of v2 of identified particles at RHIC support partonic collectivity. We also discuss the possible breaking of mass ordering of the ϕ mesons in the low pT region.