标题： QCD中插值规范下的红外行为和运行耦合 显示英文标题

标题： Infrared Behaviour and Running Couplings in Interpolating Gauges in QCD

摘要： 我们研究了介于朗道规范和库仑规范QCD之间的规范类，并证明了两个独立的鬼-胶子顶点的非重整化性质。这表明存在两个RG不变的跑动耦合，其中一个被解释为RG不变的规范参数。我们还给出了插值规范下Dyson-Schwinger方程解的渐近红外极限。这些解的红外临界指数以及其中一个耦合的结果红外不动点都与规范参数无关。这个耦合在库仑规范极限下也有一个不动点，并构成除了已知的颜色库仑势之外的第二个不变电荷。 显示英文摘要

摘要： We consider the class of gauges that interpolates between Landau- and Coulomb-gauge QCD, and show the non-renormalisation of the two independent ghost-gluon vertices. This implies the existence of two RG-invariant running couplings, one of which is interpreted as an RG-invariant gauge parameter. We also present the asymptotic infrared limit of solutions of the Dyson-Schwinger equations in interpolating gauges. The infrared critical exponents of these solutions as well as the resulting infrared fixed point of one of the couplings are independent of the gauge parameter. This coupling also has a fixed point in the Coulomb gauge limit and constitutes a second invariant charge besides the well known colour-Coulomb potential.