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arXiv 0905.4299hep-ph
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次前阶共振饱和

Resonance saturation at next-to-leading order

Ignasi Rosell

摘要:

正确估计手征微扰理论中的手征低能常数是一项十分重要的工作。为此,共振手征拉格朗日已被卓有成效地使用。我们研究了在1/N(C)展开中确定次领先(NLO)阶的手征耦合,保持完全控制重整化标度依赖性。我们发现,通过施加来自QCD的短距离约束,在1/N(C)的NLO处满足共振饱和。换句话说,手征耦合可以用共振质量和耦合来表示,而不显着依赖于共振手征理论中戈德斯通玻色子扇区中手征算符的系数。

英文摘要:

A proper estimation of the chiral low-energy constants of Chiral Perturbation Theory is a very important task. To this end resonance chiral Lagrangians have been used fruitfully. We have studied the determination of chiral couplings at next-to-leading (NLO) order in the 1/N(C) expansion, keeping full control of the renormalization scale dependence. We find that, by imposing short-distance constraints coming from QCD, resonance saturation at NLO in 1/N(C) is satisfied. In other words, the chiral couplings can be written in terms of the resonance masses and couplings and do not depend explicitly on the coefficients of the chiral operators in the Goldstone boson sector of Resonance Chiral Theory.

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