Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-10-09
Phys.Rev.C82:054904,2010
Physics
Nuclear Physics
Nuclear Theory
14 pages, including 8 figures
Scientific paper
10.1103/PhysRevC.82.054904
Using the (2+1)-dimensional viscous hydrodynamic code VISH2+1, we present systematic studies of the dependence of pion and proton transverse momentum spectra and their elliptic flow in 200 A GeV Au+Au collisions on the parameters of the hydrodynamic model (thermalization time, initial entropy density distribution, decoupling temperature, equation of state, and specific shear viscosity eta/s). We identify a tension between the slope of the proton spectra, which (within hydrodynamic simulations that assume a constant shear viscosity to entropy density ratio) prefer larger eta/s values, and the slope of the p_T-dependence of charged hadron elliptic flow, which prefers smaller values of eta/s. Changing other model parameters does not appear to permit dissolution of this tension
Heinz Ulrich W.
Huovinen Pasi
Shen Chun
Song Hui-chao
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