Properties and composition of the $f_0(500)$ resonance

Abstract

In this talk we review our recent developments on the understanding of the nature of the f_0(500) resonance---or sigma meson---coming from the N_c expansion, dispersion relations with Chiral Perturbation Theory, as well as finite energy sum rules and semi-local duality.

Comments: To appear in the proceedings of the "Excited QCD" workshop. Bjeliasnica Mountain, Sarajevo, 3-9 February 2013. Additional lattice references added in this version