Centrality dependence of elliptic flow and QGP viscosity

preprint2010arXivOpen access

Abstract

In the Israel-Stewart's theory of second order hydrodynamics, we have analysed the recent PHENIX data on charged particles elliptic flow in Au+Au collisions. PHENIX data demand more viscous fluid in peripheral collisions than in central collisions. Over a broad range of collision centrality (0-10%- 50-60%), viscosity to entropy ratio (η/sη/s) varies between 0-0.17.

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