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arXiv 1601.01573hep-lat
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电场关联函数的微扰重整化

Perturbative renormalization of the electric field correlator

C. Christensen, M. Laine

摘要:

热QCD等离子体中重夸克的动量扩散系数可以提取为与装扮Polyakov圈的双色电场的关联函数有关的输运系数。我们确定了一个特定的晶格离散的关联函数在威尔逊的SU(3)规范理论的微扰重整化因子,发现一个~12%的裸耦合值在当前一代的模拟NLO校正。这一结果对现有的晶格测定的影响进行了评论,并指出通过梯度流的非微扰重整化的可能性。

英文摘要:

The momentum diffusion coefficient of a heavy quark in a hot QCD plasma can be extracted as a transport coefficient related to the correlator of two colour-electric fields dressing a Polyakov loop. We determine the perturbative renormalization factor for a particular lattice discretization of this correlator within Wilson's SU(3) gauge theory, finding a ~12% NLO correction for values of the bare coupling used in the current generation of simulations. The impact of this result on existing lattice determinations is commented upon, and a possibility for non-perturbative renormalization through the gradient flow is pointed out.

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