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arXiv 0708.4087hep-lat
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费米子双线性算子的高阶圈重整化

Higher loop renormalization of fermion bilinear operators

A. Skouroupathis, H. Panagopoulos

摘要:

在QCD格点形式下,我们计算了定域双线性夸克算符$\barψΓψ$的双圈重整化函数,其中$Γ$表示标量和伪标量Dirac矩阵.我们认为这两个味非单态和单态运营商,后者,在标量的情况下,直接导致双圈费米子质量重整化,$Z_m$。作为上述的先决条件,我们还计算夸克场重整化,$Z_ψ$,多达两个循环。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。我们的结果在$c_{SW}$中以重整化费曼规范下的重整化和裸耦合常数的多项式形式给出。我们还确定了一般规范的单圈重整化函数。本工作的更长的写作,包括我们的结果转换为MSbar方案和推广到任意费米子表示,可以在arXiv:0707.2906中找到。

英文摘要:

We compute the two-loop renormalization functions, in the RI' scheme, of local bilinear quark operators $\barψΓψ$, where $Γ$ denotes the Scalar and Pseudoscalar Dirac matrices, in the lattice formulation of QCD. We consider both the flavor non-singlet and singlet operators; the latter, in the scalar case, leads directly to the two-loop fermion mass renormalization, $Z_m$. As a prerequisite for the above, we also compute the quark field renormalization, $Z_ψ$, up to two loops. We use the clover action for fermions and the Wilson action for gluons. Our results are given as a polynomial in $c_{SW}$, in terms of both the renormalized and bare coupling constant, in the renormalized Feynman gauge. We also confirm the 1-loop renormalization functions, for generic gauge. A longer write-up of the present work, including the conversion of our results to the MSbar scheme and a generalization to arbitrary fermion representations, can be found in arXiv:0707.2906 .

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