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arXiv 0710.0072hep-lat
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Wilson ChPT中的矢量流和轴向矢量流

The vector and axial vector current in Wilson ChPT

Sinya Aoki, Oliver Bar

摘要:

我们构造了Wilson手征微扰理论(WChPT)中的矢量流和轴向矢量流,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。我们的结构与连续QCD中的ChPT略有不同,其中电流基本上是与手征对称性相关的(部分)守恒电流。在WChPT中,由于在非零晶格间距处的明确的手征对称性破缺,在电流的表达式中出现了O(a)项,其不是源于有效作用。此外,需要考虑电流的有限重正化,以便适当地匹配有效理论的电流。作为一个例子,我们计算f_pi的一个循环与重正化轴向矢量流为一个特定的重正化条件。事实证明,对于这个特定的条件,一些O(a)修正是由重整化处理的。

英文摘要:

We construct the vector and axial vector currents in Wilson Chiral Perturbation Theory (WChPT), the low-energy effective theory for lattice QCD with Wilson fermions. Our construction is slightly different compared to ChPT in continuum QCD, where the currents are essentially the (partially) conserved currents associated with the chiral symmetries. In WChPT, due to explicit chiral symmetry breaking at non-zero lattice spacing, there appear O(a) terms in the expressions for the currents which do not stem from the effective action. In addition, the finite renormalization of the currents needs to be taken into account in order to properly match the currents of the effective theory. As an illustration we compute f_pi to one loop with the renormalized axial vector current for a particular renormalization condition. It turns out that for this particular condition some of the O(a) corrections are taken care of by the renormalization.

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