Caron-Huot Simon, Moore Guy D
Physics Department, McGill University, 3600 rue University, Montréal, QC H3A 2T8, Canada.
Phys Rev Lett. 2008 Feb 8;100(5):052301. doi: 10.1103/PhysRevLett.100.052301. Epub 2008 Feb 6.
We compute the momentum diffusion coefficient of a heavy quark in a hot QCD plasma, to next-to-leading order in the weak-coupling expansion. Corrections arise at [see formula]; physically they represent interference between overlapping scatterings, as well as soft, electric scale (p approximately gT) gauge field physics, which we treat using the hard thermal loop effective theory. In 3-color, 3-flavor QCD, the momentum diffusion constant of a fundamental representation heavy quark at next-to-leading order is kappa = 16pi/3alpha(s)(2)T(3)(ln1/g(s)+0.07428+1.9026 g(s)). The convergence of the perturbative expansion is poor.
我们在弱耦合展开中计算了热QCD等离子体中重夸克的动量扩散系数，精确到次领头阶。修正出现在[见公式]；从物理角度看，它们代表了重叠散射之间的干涉，以及软的、电标度（p约为gT）规范场物理，我们使用硬热圈有效理论来处理这些物理。在三色三味QCD中，基本表示重夸克在次领头阶的动量扩散常数为κ = 16π/3αs(2)T(3)(ln1/gs + 0.07428 + 1.9026gs)。微扰展开的收敛性很差。
