Saturation of elliptic flow and shear viscosity

Details Saturation of elliptic flow and shear viscosity Saturation of elliptic flow and shear viscosity

2007-08-09

arxiv.org/abs/0708.1252v2

Physics

Nuclear Physics

Nuclear Theory

In the revised version, viscous dynamics predictions for pT spectra of identified particles are shown. 4 pages, 2 figures

Scientific paper

Effect of shear viscosity on elliptic flow is studied in causal dissipative hydrodynamics in 2+1 dimensions. Elliptic flow is reduced in viscous dynamics. Causal evolution of minimally viscous fluid ($\eta/s$=0.08), can explain the PHENIX data on elliptic flow in 16-23% Au+Au collisions up to $p_T\approx$3.6 GeV. In contrast, ideal hydrodynamics, can explain the same data only up to $p_T\approx$1.5 GeV. $p_T$ spectra of identified particles are also better explained in minimally viscous fluid than in ideal dynamics. However, saturation of elliptic flow at large $p_T$ is not reproduced.

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