Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-06-23
Phys.Rev.C82:047901,2010
Physics
Nuclear Physics
Nuclear Theory
4 pages, 2 figures, 2 tables. Final version to be published in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.82.047901
Taking into account of entropy generation during evolution of a viscous fluid, we have estimated inverse Knudsen number, ideal hydrodynamic limit for elliptic flow and QGP viscosity to entropy ratio in $\sqrt{s}$=62 and 200 GeV Cu+Cu/Au+Au collisions. Viscosity to entropy ratio is estimated as $\eta/s=0.17\pm 0.10\pm 0.20$, the first error is statistical, the second one is systematic. In a central Au+Au collision, inverse Knudsen number is $\approx 2.80\pm 1.63$, which presumably small for complete equilibration. In peripheral collisions it is even less. Ideal hydrodynamic limit for elliptic flow is $\sim$40% more than the experimental flow in a central collision.
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