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arXiv 0903.2440hep-ph
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NLO在1/Nc中手性耦合的共振饱和

Resonance saturation of the chiral couplings at NLO in 1/Nc

Ignasi Rosell, Pedro Ruiz-Femenia, Juan Jose Sanz-Cillero

摘要:

目前,由于缺乏对低能常数(LEC)的了解,手征微扰理论在唯象应用中的精度受到限制。假设的最重要的贡献,LEC来自动力学的低洼共振,通常被称为共振饱和假设,刺激了使用大Nc共振拉格朗日函数,以获得明确的值LEC。我们研究了共振手征理论(RChT)的框架内的1/Nc展开的下一个领先阶共振饱和假设的有效性。我们发现,通过施加QCD短程约束,手征耦合可以写在共振质量和耦合方面,并不明确地依赖于手征运营商的系数在Goldstone玻色子部门的RChT。正如我们所论证的,这是共振拉格朗日量上下文中共振饱和陈述的对应表述。在1/Nc计数中超越领先顺序使我们能够完全控制LEC估计的重整化尺度依赖性。

英文摘要:

The precision obtainable in phenomenological applications of Chiral Perturbation Theory is currently limited by our lack of knowledge on the low-energy constants (LECs). The assumption that the most important contributions to the LECs come from the dynamics of the low-lying resonances, often referred to as the resonance saturation hypothesis, has stimulated the use of large-Nc resonance lagrangians in order to obtain explicit values for the LECs. We study the validity of the resonance saturation assumption at the next-to-leading order in the 1/Nc expansion within the framework of Resonance Chiral Theory (RChT). We find that, by imposing QCD short-distance constraints, 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 RChT. As we argue, this is the counterpart formulation of the resonance saturation statement in the context of the resonance lagrangian. Going beyond leading order in the 1/Nc counting allow us to keep full control of the renormalization scale dependence of the LEC estimates.

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