Jet quenching parameters in strongly coupled nonconformal gauge theories

被引：72
作者：
Buchel, Alex [1 ]
机构：
[1] Univ Western Ontario, Dept Appl Math, London, ON N6A 5B7, Canada
[2] Perimeter Inst Theoret Phys, Waterloo, ON N2J 2W9, Canada
来源：
PHYSICAL REVIEW D | 2006年 / 74卷 / 04期
关键词：
D O I：
10.1103/PhysRevD.74.046006
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recently Liu, Rajagopal, and Wiedemann (LRW) [H. Liu, K. Rajagopal, and U. A. Wiedemann, hep-ph/0605178.] proposed a first principle, nonperturbative quantum field theoretic definition of "jet quenching parameter" (q) over cap used in models of medium-induced radiative parton energy loss in nucleus-nucleus collisions at RHIC. Relating (q) over cap to a short-distance behavior of a certain lightlike Wilson loop, they used gauge theory-string theory correspondence to evaluate (q) over cap for the strongly coupled N=4 SU(N-c) gauge theory plasma. We generalize analysis of LRW to strongly coupled nonconformal gauge theory plasma. We find that a jet quenching parameter is gauge theory specific (not universal). Furthermore, it appears its value increases as the number of effective adjoint degrees of freedom of a gauge theory plasma increases.
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页数：6
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