STAR's measurement of directed flow for pions,kaons(K0S),protons and anti-protons,for Au+Au collisions at 200 GeV obtained in Run7 are presented,as well as elliptic flow for identified particles measured in Au+Au(Run7)and Cu+Cu(Run5)collisions.It is found that the slope of proton v1(y)at midrapidity is extremely small.Elliptic flow results are compared to Hydro calculation and the discrepancy is discussed.
heavy ion collisionselliptic flowdirected flowanti-flowideal hydrodynamic
CHEN Jia-Yun、LIU Feng
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Institute of Particle Physics,Huazhong Normal University(HZNU),Wuhan 430079,China
The Key Laboratory of Quark and Lepton Physics(HZNU),Ministry of Education,Wuhan 430079,China
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