Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-08-30
Phys.Rev.Lett.100:052301,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.100.052301
We compute the momentum diffusion coefficient of a nonrelativistic heavy quark in a hot QCD plasma, to next-to-leading order in the weak coupling expansion. Corrections arise at O(g); physically they represent interference between overlapping scatterings, as well as soft, electric scale ($p\sim gT$) gauge field physics, which we treat using the hard thermal loop (HTL) effective theory. In 3-color, 3-flavor QCD, the momentum diffusion constant of a fundamental representation heavy quark at NLO is $\kappa = \frac{16\pi}{3} \alpha_s^2 T^3 (\ln \frac{1}{g} + 0.07428 + 1.8869 g)$. The convergence of the weak coupling expansion is poor.
Caron-Huot Simon
Moore Guy D.
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