Large-Nc Properties of the rho and f0(600) Mesons from Unitary Resonance Chiral Dynamics

Understand

We construct pi-pi amplitudes that fulfill exact elastic unitarity, account for one loop Chiral Perturbation Theory contributions and include all 1/Nc leading terms, with the only limitation of considering just the lowest-lying nonet of exchanged resonances.

• Within such scheme, the Nc dependence of sigma and rho masses and widths is discussed.
• Robust conclusions are drawn in the case of the rho resonance, confirming that it is a stable meson in the limit of a large number of QCD colors, Nc.
• Less definitive conclusions are reached in the scalar-isoscalar sector.