Charmonium production from nonequilibrium charm and anticharm quarks in quark-gluon plasma

被引：27
|
作者：
Song, Taesoo [1 ]
Han, Kyong Chol [1 ,2 ]
Ko, Che Ming [1 ,2 ]
机构：
[1] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA
[2] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA
来源：
PHYSICAL REVIEW C | 2012年 / 85卷 / 05期
基金：
美国国家科学基金会;
关键词：
SHORT-DISTANCE ANALYSIS; HEAVY; SUPPRESSION; SYSTEMS; J/PSI;
D O I：
10.1103/PhysRevC.85.054905
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：
Parameterizing the charm and anticharm quark momentum distributions by the Tsallis distribution, we study the nonequilibrium effect on the charmonium production rate in a quark-gluon plasma up to the next-to-leading order in perturbative QCD. We find that nonequilibrium charm and anticharm quarks suppress the charmonium production rate compared to that from equilibrated ones. We further show that the suppression factor calculated with the charm quark relaxation time, which has frequently been used in the literature, is close to our results.
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页数：8
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