Speaker
Guillermo Ríos
(Universidad Complutense de Madrid)
Description
We study the rho(770) and sigma(600) resonances by means of the Inverse Amplitude Method (IAM). The IAM is based on unitarity, analyticity and Chiral Perturbation Theory only and generates poles on the second Riemann sheet of pion-pion partial wave amplitudes associated to the resonances without any a priori assumptions on their existence or nature. In particular, we study the leading 1/N_c dependence of some resonance parameters to sheds light on their espectroscopic nature. The rho meson follows the expected qqbar scaling whereas we find a non qqbar dominant component for the sigma. We also study the m_\pi dependence of the resonance parameters to connect with lattice studies.
Primary author
Guillermo Ríos
(Universidad Complutense de Madrid)