Chiral Extrapolation of light resonances from Unitarized Chiral Perturbation Theory

Abstract

Both scalar and vector light resonances can be generated from the unitarization of one-loop chiral perturbation theory. This amounts to using in a dispersion relation the chiral expansion, which incorporates the correct QCD quark mass dependence. We can thus predict the quark mass dependence of the poles associated to those light resonances. Our results compare well with some recent lattice results for the rho(770) mass and can be used as a benchmark for future lattice results on the rho(770) or the f0(600) also known as the sigma.

To appear in the proceedings of the XII Int. Conf. on Hadron Spectroscopy. HADRON07. Frascati, October, 2007. 8 pages, 3 figures. References added and updated, typos corrected