Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-09-30
J.Phys.Conf.Ser.270:012044,2011
Physics
Nuclear Physics
Nuclear Theory
Proceedings of Hot Quarks 2010, 21-26 June 2010 La Londe Les Maures, 4 pages, 2 figures
Scientific paper
10.1088/1742-6596/270/1/012044
Using ideal and viscous hydrodynamics, the ratio of azimuthal moments v4/(v2)^2 is calculated for pions, protons, and kaons in sqrt{s}=200 A*GeV Au+Au collisions. For any value of viscosity here is little dependence on particle species. Ideal hydrodynamics and data show a flat curve as a function of pt. Adding viscosity in the standard way destroys this flatness. However, it can be restored by replacing the standard quadratic ansatz for delta f (the viscous correction to the distribution function at freeze-out) with a weaker momentum dependence.
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