Abstract
Using ideal and viscous hydrodynamics, the ratio of azimuthal moments v4(v2)2 is calculated for pions, protons, and kaons in = 200A 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 δf (the viscous correction to the distribution function at freeze-out) with a weaker momentum dependence.
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