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arXiv 1707.07152hep-lathep-ph
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格点上准PDF非定域夸克双线性的辅助场非微扰重整化

Nonperturbative renormalization of nonlocal quark bilinears for quasi-PDFs on the lattice using an auxiliary field

Jeremy Green, Karl Jansen, Fernanda Steffens

摘要:

准PDF提供了一个途径,以从头计算的部分子分布函数(PDF)使用格点量子色动力学。计算准PDF所面临的问题之一是非定域算子的重正化。通过引入一个辅助场,我们可以用一对局部算子来代替推广理论中的非局部算子。在晶格上,这与静态夸克理论密切相关。在这种方法中,我们将展示如何理解混合模式,允许由手征对称性打破,并获得一个主公式重正化的非本地运营商,取决于三个参数。我们提出了一种非微扰确定这些参数的方法,并使用微扰理论转换为MS-酒吧计划。重整化参数获得两个晶格间距使用威尔逊扭曲的质量费米子和不同的离散化的威尔逊线的非局部运营商。使用这些参数,我们显示的核子矩阵元与介子质量约370 MeV的重整化的效果,并比较重整化的结果为两个晶格间距。重整化矩阵元在不同的Wilson线离散和晶格间距之间是一致的。

英文摘要:

Quasi-PDFs provide a path toward an ab initio calculation of parton distribution functions (PDFs) using lattice QCD. One of the problems faced in calculations of quasi-PDFs is the renormalization of a nonlocal operator. By introducing an auxiliary field, we can replace the nonlocal operator with a pair of local operators in an extended theory. On the lattice, this is closely related to the static quark theory. In this approach, we show how to understand the pattern of mixing that is allowed by chiral symmetry breaking, and obtain a master formula for renormalizing the nonlocal operator that depends on three parameters. We present an approach for nonperturbatively determining these parameters and use perturbation theory to convert to the MS-bar scheme. Renormalization parameters are obtained for two lattice spacings using Wilson twisted mass fermions and for different discretizations of the Wilson line in the nonlocal operator. Using these parameters we show the effect of renormalization on nucleon matrix elements with pion mass approximately 370 MeV, and compare renormalized results for the two lattice spacings. The renormalized matrix elements are consistent among the different Wilson line discretizations and lattice spacings.

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