Knudsen number, ideal hydrodynamic limit for elliptic flow, and QGP viscosity in √sNN=62 and 200 GeV Cu+Cu/Au plus Au collisions

被引：8

作者：

Chaudhuri, A. K. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Ctr Variable Energy Cyclotron, Kolkata 700064, W Bengal, India

来源：

PHYSICAL REVIEW C | 2010年 / 82卷 / 04期

关键词：

SYSTEM SIZE DEPENDENCE; QUARK-GLUON PLASMA; V(2)/EPSILON; PERSPECTIVE; MATTER; ENERGY;

D O I：

10.1103/PhysRevC.82.047901

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：

Taking into account entropy generation during evolution of a viscous fluid, we have estimated the inverse Knudsen number, the ideal hydrodynamic limit for elliptic flow, and the quark-gluon plasma viscosity to entropy ratio in root s(NN) = 62 and 200 GeV Cu+Cu/Au+Au collisions. The viscosity to entropy ratio is estimated as eta/s = 0.17 +/- 0.10 +/- 0.20, where the first error is statistical, the second one is systematic. In a central Au+Au collision, the inverse Knudsen number is approximate to 2.80 +/- 1.63, which is presumably too small for complete equilibration. In peripheral collisions it is even less. The ideal hydrodynamic limit for elliptic flow is similar to 40% more than the experimental flow in a central collision.

引用

页数：4

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