Calculating the jet quenching parameter

被引：379

作者：

Liu, Hong

Rajagopal, Krishna

Wiedemann, Urs Achim

机构：

[1] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA

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

[4] Brookhaven Natl Lab, RIKEN, Res Ctr, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.97.182301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Models of medium-induced radiative parton energy loss account for the strong suppression of high-p(T) hadron spectra in root s(NN)=200 GeV Au-Au collisions at BNL RHIC in terms of a single "jet quenching parameter" q. We observe that q can be given a model-independent, nonperturbative, quantum field theoretic definition in terms of the short-distance behavior of a particular lightlike Wilson loop. We then use the anti-de Sitter/conformal-field-theory correspondence to obtain a strong-coupling calculation of q in hot N=4 supersymmetric QCD, finding q(SYM)=26.69 root alpha SYMNcT3 in the limit in which both N-c and 4 pi alpha N-SYM(c) are large. Thus, at strong coupling q is not proportional to the entropy density s, or to some "number density of scatterers" since, unlike the number of degrees of freedom, q does not grow like N-c(2).

引用

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