Abstract
We report on the first measurement of elliptic flow ν2(pT) of multistrange baryons Ξ-+Ξ̄+ and Ω-+Ω̄+ in heavy-ion collisions. In minimum-bias Au+Au collisions at sNN=200GeV, a significant amount of elliptic flow, comparable to other nonstrange baryons, is observed for multistrange baryons which are expected to be particularly sensitive to the dynamics of the partonic stage of heavy-ion collisions. The pT dependence of ν2 of the multistrange baryons confirms the number of constituent quark scaling previously observed for lighter hadrons. These results support the idea that a substantial fraction of the observed collective motion is developed at the early partonic stage in ultrarelativistic nuclear collisions at the Relativistic Heavy Ion Collider.