Comments on the large Nc behavior of light scalars

Abstract

I review the large Nc behavior of light resonances generated from unitarized one-loop Chiral Perturbation Theory. In contrast with the rho or K*, the scalar behavior is at odds with a qqbar "dominant component". In fact, in the light scalar region, meson-meson amplitudes vanish as Nc increases. Also, the scalar widths, obtained from their associated poles, behave as O(Nc^{1/2})<Gamma<O(Nc). We also clarify on the physical relevance of considering large Nc not too far from real life, Nc=3, and the interpretation of the mathematical Nc=infinity limit.

arXiv commentTo appear in the Proceedings of the Rencontres de Blois EDS05 Conference. Chateau de Blois, May 15-20,2005. France

References in corpus (5)

• Model dependent analyses on the $N_c$ dependence of the $\sigma$ pole trajectory
• Large Nc Behavior of Light Scalar Meson Nonet Revisited
• Revisit to Low Mass Scalar Mesons via Unitarized Chiral Perturbation Theory
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Cited by in corpus (2)

• Properties of light resonances from unitarized Chiral perturbation theory: Nc behavior and quark mass dependence
• Unitarized Chiral Perturbation Theory and the meson spectrum