Radiative energy loss and v2 spectra for viscous hydrodynamics

被引：159

作者：

Dusling, Kevin ^{[1
]}

Moore, Guy D. ^{[2
]}

Teaney, Derek ^{[3
]}

机构：

[1] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[2] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[3] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

来源：

PHYSICAL REVIEW C | 2010年 / 81卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

QUARK-GLUON PLASMA; MULTIPLE PARTON SCATTERING; COLOR GLASS CONDENSATE; ELLIPTIC FLOW; COMPLEX FLUIDS; THERMODYNAMICS; DYNAMICS; TRANSPORT; NONSTATIONARY; PERSPECTIVE;

D O I：

10.1103/PhysRevC.81.034907

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：

This work investigates the first correction to the equilibrium phase-space distribution and its effects on spectra and elliptic flow in heavy-ion collisions. We show that the departure from equilibrium on the freeze-out surface is the largest part of the viscous corrections to v(2)(p(T)). However, the momentum dependence of the departure from equilibrium is not known a priori, and it is probably not proportional to p(T)(2) as has been assumed in hydrodynamic simulations. At high momentum in weakly coupled plasmas, it is determined by the rate of radiative energy loss and is proportional to p(T)(3/2). The weaker p(T) dependence leads to straighter v(2)(p(T)) curves at the same value of viscosity. Furthermore, the departure from equilibrium is generally species dependent. A species-dependent equilibration rate, with baryons equilibrating faster than mesons, can explain "constituent quark scaling" without invoking coalescence models.

引用

页数：17

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