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arXiv 0710.0710hep-lat
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猝灭畴壁QCD中四夸克算符和B_K的非微扰重整化

Non-perturbative renormalization of four-quark operators and B_K with Schroedinger functional scheme in quenched domain-wall QCD

Yousuke Nakamura, Yusuke Taniguchi, for CP-PACS Collaboration

摘要:

利用薛定谔泛函方法计算了猝灭畴壁QCD中$ΔS=2$四夸克算符的非微扰重整化因子。在强子尺度下计算了$B_K$的非微扰重整化因子。结合Alpha合作得到的非微扰RG运行,我们的结果得到了重整化因子,它将格点裸$B_K$转化为重整化群不变.我们应用重整化因子裸$B_K$先前获得的CP-PACS合作淬火畴壁QCD(DWQCD)。我们将所得结果与用微扰重整化因子、不同重整化方案或不同夸克作用量得到的结果进行了比较。我们还表明,在重整化因子的手征对称性破缺的影响是数值小。

英文摘要:

We present non-perturbative renormalization factors for $ΔS=2$ four-quark operators in quenched domain-wall QCD using the Schroedinger functional method. Non-perturbative renormalization factor for $B_K$ is evaluated at hadronic scale. Combined with the non-perturbative RG running obtained by the Alpha collaboration, our result yields renormalization factor which converts lattice bare $B_K$ to the renormalization group invariant one. We apply the renormalization factor to bare $B_K$ previously obtained by the CP-PACS collaboration with the quenched domain-wall QCD(DWQCD). We compare our result with previous ones obtained by perturbative renormalization factors, different renormalization schemes or different quark actions. We also show that chiral symmetry breaking effects in the renormalization factor are numerically small.

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