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arXiv 2002.09408hep-lathep-ph
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辅助场方法中格点上Wilson线算子的改进、推广和格式转换

Improvement, generalization, and scheme conversion of Wilson-line operators on the lattice in the auxiliary field approach

Jeremy R. Green, Karl Jansen, Fernanda Steffens

摘要:

利用连接路径连接的非定域夸克双线性算符,利用格点量子色动力学研究了强子的部分子分布函数和横动量依赖的部分子分布函数。非定域性使得很难理解这些算子的重整化和改进。在以前的工作中,我们表明,通过在格点上引入辅助场,可以理解为在扩展理论中的两个局部算子的乘积的轴上威尔逊线算子。在本文中,我们提供了详细的微扰理论中的因子的计算转换从我们的晶格合适的重整化方案的MS-酒吧计划。扩展我们的工作,我们研究了扩展理论的Symanzik改进,以了解晶格间距,$a$,即使晶格费米子作用完全保持手征对称性,也存在线性离散化效应的模式。这为最终的$O(a)$改进PDF的晶格计算提供了前景。我们还推广我们的方法适用于威尔逊线沿晶格对角线和分段直链接路径。

英文摘要:

Nonlocal quark bilinear operators connected by link paths are used for studying parton distribution functions (PDFs) and transverse momentum-dependent PDFs of hadrons using lattice QCD. The nonlocality makes it difficult to understand the renormalization and improvement of these operators using standard methods. In previous work, we showed that by introducing an auxiliary field on the lattice, one can understand an on-axis Wilson-line operator as the product of two local operators in an extended theory. In this paper, we provide details about the calculation in perturbation theory of the factor for conversion from our lattice-suitable renormalization scheme to the MS-bar scheme. Extending our work, we study Symanzik improvement of the extended theory to understand the pattern of discretization effects linear in the lattice spacing, $a$, which are present even if the lattice fermion action exactly preserves chiral symmetry. This provides a prospect for an eventual $O(a)$ improvement of lattice calculations of PDFs. We also generalize our approach to apply to Wilson lines along lattice diagonals and to piecewise-straight link paths.

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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