Chiral extrapolations of the ρ(770) meson in Nf=2+1 lattice QCD simulations

Recent N-f = 2 + 1 lattice data for meson-meson scattering in the p-wave and with isospin I = 1 are analyzed using a unitarized model inspired by chiral perturbation theory in the inverse-amplitude formulation for two and three flavors. Chiral extrapolations are performed that postdict phase shifts extracted from experiment quite well. In addition, the low-energy constants are compared to the ones from a recent analysis of N-f = 2 lattice QCD simulations to check for the consistency of the hadronic model used here. Some inconsistencies are detected in the fits to N-f = 2 + 1 data, in contrast to the previous analysis of N-f = 2 data.