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arXiv 0709.3236hep-ph
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测定NLO处的手性偶合

Determining chiral couplings at NLO

Ignasi Rosell

摘要:

我们提出了一个通用的方法,可以估计的手征微扰理论的低能常数,以下一个领先的1/N(C)展开的修正,即保持完全控制的重整化尺度依赖。作为第一步,我们已经确定了与两个标量和赝标量电流的两点相关函数之差有关的耦合L(8)和C(38),L(8)(μ_0)=(0.6 \pm 0.4)10 ^{-3}和C(38)(μ_0)=(2 \pm 6)10 ^{-6}$,其中μ_0 = 0.77 GeV。与许多有效的方法一样,这种方法的主要成分之一是匹配过程:这里给出了与此主题相关的一些评论。

英文摘要:

We present a general method that allows to estimate the low-energy constants of Chiral Perturbation Theory up to next-to-leading corrections in the 1/N(C) expansion, that is, keeping full control of the renormalization scale dependence. As a first step we have determined L(8) and C(38), the couplings related to the difference of the two-point correlation functions of two scalar and pseudoscalar currents, L(8)(mu_0) = (0.6 \pm 0.4) 10^{-3} and C(38)(mu_0) = (2 \pm 6) 10^{-6}$, with mu_0 = 0.77 GeV. As in many effective approaches, one of the main ingredients of this method is the matching procedure: some comments related to this topic are presented here.

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