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arXiv 0909.2281hep-lat
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Wilson手征微扰理论中的矢量流和轴流

The vector and axial currents in Wilson chiral perturbation theory

Sinya Aoki, Oliver Bar, Stephen R. Sharpe

摘要:

我们重新考虑了Wilson手征微扰理论(WChPT)中矢量流和轴向流的构造和匹配问题。WChPT是一种低能有效的含Wilson费米子的格点量子色动力学理论。特别是,我们详细讨论了有限重整化的电流对它们的匹配从晶格理论WChPT的影响。我们明确表明,施加手征沃德-高桥身份的电流导致,在一般情况下,额外的条款O(a)的轴向电流。我们通过计算双味理论中一圈阶的π衰变常数来说明对物理量的影响。我们的结果不同于以前发表的。

英文摘要:

We reconsider the construction and matching of the vector and axial currents in Wilson Chiral Perturbation Theory (WChPT), the low-energy effective theory for lattice QCD with Wilson fermions. In particular, we discuss in detail the impact of the finite renormalization of the currents on their matching from the lattice theory to WChPT.We explicitly show that imposing chiral Ward-Takahashi identities on the currents leads, in general, to additional terms of O(a) in the axial current. We illustrate the impact on physical quantities by computing the pion decay constant to one-loop order in the two flavor theory. Our result differs from previously published ones.

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