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arXiv 1002.3513hep-lat
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格点上费米子双线性算子的双圈重整化

Two-loop renormalization of fermion bilinear operators on the lattice

A. Skouroupathis, H. Panagopoulos

摘要:

在RI'方案下,计算了定域双线性夸克算符$\barψΓψ$在格点上的重整化函数,其中$Γ= 1, γ_5, γ_μ, γ_5γ_μ, γ_5σ_{μν}$ .首次对两个回路进行了计算。我们认为这两个味非单态和单态运营商。作为上述的先决条件,我们计算夸克场重整化,$Z_ψ$,多达两个循环。我们还计算了胶子场$Z_A$、鬼场$Z_c$、规范参数$Z_α$和耦合常数$Z_g$的单圈重整化函数。我们对费米子使用三叶草作用量,对胶子使用威尔逊作用量。我们的结果给出了耦合常数,三叶草系数$c_{SW}$,费米子颜色($N_c$)和口味($N_f$)的数量的显式函数,在重整化费曼规范。所有的单回路量都是在一个任意的量规中计算的。最后,我们提出了我们的结果在MS-酒吧计划,更容易与连续计算比较。我们推广到任意表象中的费米子场。从两圈费曼图的计算中得到的表面发散积分的一些特殊性质在参考文献1中有详细的介绍。

英文摘要:

We compute the renormalization functions on the lattice, in the RI' scheme, of local bilinear quark operators $\barψΓψ$, where $Γ= 1, γ_5, γ_μ, γ_5γ_μ, γ_5σ_{μν}$. This calculation is carried out to two loops for the first time. We consider both the flavor non-singlet and singlet operators. As a prerequisite for the above, we compute the quark field renormalization, $Z_ψ$, up to two loops. We also compute the 1-loop renormalization functions for the gluon field, $Z_A$, ghost field, $Z_c$, gauge parameter, $Z_α$, and coupling constant $Z_g$. We use the clover action for fermions and the Wilson action for gluons. Our results are given as an explicit function of the coupling constant, the clover coefficient $c_{SW}$, and the number of fermion colors ($N_c$) and flavors ($N_f$), in the renormalized Feynman gauge. All 1-loop quantities are evaluated in an arbitrary gauge. Finally, we present our results in the MS-bar scheme, for easier comparison with calculations in the continuum. We have generalized to fermionic fields in an arbitrary representation. Some special features of superficially divergent integrals, obtained from the evaluation of two-loop Feynman diagrams, are presented in detail in Ref. 1.

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