Systematic parameter study of hadron spectra and elliptic flow from viscous hydrodynamic simulations of Au plus Au collisions at √sNN=200 GeV

被引：135

作者：

Shen, Chun ^{[1
]}

Heinz, Ulrich ^{[1
]}

Huovinen, Pasi ^{[2
]}

Song, Huichao ^{[1
,3
]}

机构：

[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[2] Goethe Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW C | 2010年 / 82卷 / 05期

关键词：

QUARK-GLUON PLASMA; NUCLEAR COLLISIONS; PHASE-TRANSITION; TEMPERATURE; DEPENDENCE; EVOLUTION; MODELS; MATTER;

D O I：

10.1103/PhysRevC.82.054904

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Using the (2 + 1)-dimensional viscous hydrodynamic code VISH2 + 1 [H. Song and U. Heinz, Phys. Lett. B 658, 279 (2008); H. Song and U. Heinz, Phys. Rev. C 77, 064901 (2008); H. Song, Ph. D. thesis, The Ohio State University, 2009], we present systematic studies of the dependence of pion and proton transverse-momentum spectra and their elliptic flow in 200A 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.

引用

页数：13

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