Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-05-26
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages. Contribution to the proceedings of EFT'09 - International Workshop on Effective Field Theories: from the Pion to the
Scientific paper
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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