$N_C$ evolution of the light meson resonances

Abstract

The variation of the resonance poles, i.e., the mass and width, originating from changing the values of $N_C$, the number of the QCD colors, provide an intuitive theoretical method to discriminate the interior constituents of hadrons. Many different approaches, including unitarized chiral amplitudes, dispersive methods, quark models, linear-sigma-model-like framework, etc., have been widely used to determine the $N_C$ trajectories of the various resonance pole positions. We focus on the discussions of the light-flavor meson resonances in this work.

22 pages, 4 figures. An invited review in the issue of "Topics in Light-quark Physics" published in Eur.Phys.J Special Topics

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