论文标题
重夸克扩散的质量抑制作用
Mass-suppressed effects in heavy quark diffusion
论文作者
论文摘要
重夸克扩散的许多晶格研究源自颜色电子相关因子，这些相关因子是在较重夸克质量倒数倒数后作为领先术语获得的。鉴于魅力夸克并不是特别沉重的事实，我们考虑扩展中的统一术语。我们认为，衡量$ O（1/m^2）$的相关器，我们认为领先的更正被$ O（T/m）$抑制，其中一个可以从颜色磁相关器中提取。相应的运输系数在弱耦合扩展中已经处于领先顺序，因此需要非扰动的确定。
Many lattice studies of heavy quark diffusion originate from a colour-electric correlator, obtained as a leading term after an expansion in the inverse of the heavy-quark mass. In view of the fact that the charm quark is not particularly heavy, we consider subleading terms in the expansion. Working out correlators up to $O(1/M^2)$, we argue that the leading corrections are suppressed by $O(T/M)$, and one of them can be extracted from a colour-magnetic correlator. The corresponding transport coefficient is non-perturbative already at leading order in the weak-coupling expansion, and therefore requires a non-perturbative determination.
