论文标题
Landau仪表中筛选的大规模扩张的一环RG改进
One-loop RG improvement of the screened massive expansion in the Landau gauge
论文作者
论文摘要
在两个重新归一化方案，动量减法方案（MOM）方案和筛选的动量减法（SMOM）方案中，研究了筛选的大规模扩展的RG改进。如果耦合的初始值足够小，则表明各自的Taylor-Scheme运行耦合不开发Landau极。发现改进的幽灵和gluon传播器的行为能够如预期的那样，显示了胶子的动态质量产生以及普通扰动理论的标准UV限制。在MOM方案中，当通过与固定耦合框架的匹配进行优化时，该方法被证明是获取传播剂的强大方法，用于获得与已经在一个循环中的晶格数据非常吻合的传播器。优化后，gluon质量参数作为理论的唯一自由参数，并显示出与普通扰动QCD量表$λ_ {\ text {qcd}} $相同的作用。
The RG improvement of the screened massive expansion is studied at one loop in two renormalization schemes, the momentum subtraction (MOM) scheme and the screened momentum subtraction (SMOM) scheme. The respective Taylor-scheme running couplings are shown not to develop a Landau pole, provided that the initial value of the coupling is sufficiently small. The improved ghost and gluon propagators are found to behave as expected, displaying dynamical mass generation for the gluons and the standard UV limit of ordinary perturbation theory. In the MOM scheme, when optimized by a matching with the fixed-coupling framework, the approach proves to be a powerful method for obtaining propagators which are in excellent agreement with the lattice data already at one loop. After optimization, the gluon mass parameter is left as the only free parameter of the theory and is shown to play the same role of the ordinary perturbative QCD scale $Λ_{\text{QCD}}$.
