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arXiv 1402.6581hep-lat
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格点量子色动力学的高圈微扰重整化常数(III):岩崎规范action和n_f=4 Wilson费米子的三圈夸克流

High-loop perturbative renormalization constants for Lattice QCD (III): three-loop quark currents for Iwasaki gauge action and n_f=4 Wilson fermions

M. Brambilla, F. Di Renzo, M. Hasegawa

摘要:

这是关于格点量子色动力学重整化常数的三圈计算的系列论文的第三篇。我们主要感兴趣的是由Iwasaki规范作用量和n_f=4 Wilson费米子定义的正则化的结果。我们的结果夸克双线性重整化根据RI '-ESTA计划可以比较非微扰的结果。后者适用于扭曲质量QCD:定义在手征极限中,重整化常数必须相同。我们还讨论了更普遍的问题。特别是,我们讨论了一些方法的问题,如提升微扰理论的有效性和无关的和有限体积的贡献解开连接到总结的微扰系列。在讨论这些问题时,我们不仅考虑了本文的新结果,而且考虑了我们在最近的一篇文章中提出的由树能级Symanzik改进规范作用量和n_f=2的Wilson费米子定义的正则化的结果。最后,我们评论在何种程度上,我们把在工作中的NSPT上下文中的技术可以提供一个新鲜的外观到晶格版本的RI '-RISK计划。

英文摘要:

This is the third of a series of papers on three-loop computation of renormalization constants for Lattice QCD. Our main point of interest are results for the regularization defined by Iwasaki gauge action and n_f=4 Wilson fermions. Our results for quark bilinears renormalized according to the RI'-MOM scheme can be compared to non-perturbative results. The latter are available for Twisted Mass QCD: being defined in the chiral limit, renormalization constants must be the same. We also address more general problems. In particular, we discuss a few methodological issues connected to summing the perturbative series such as the effectiveness of Boosted Perturbation Theory and the disentanglement of irrelevant and finite volume contributions. Discussing these issues we consider ont only the new results of this paper, but also those for the regularization defined by tree-level Symanzik improved gauge action and n_f=2 Wilson fermions, which we presented in a recent paper of ours. We finally comment to which extent the techniques we put at work in the NSPT context can provide a fresher look into the lattice version of the RI'-MOM scheme.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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