Speaker: Jose PELAEZ
Title
Complete low energy meson-meson scattering within Unitarized one-loop Chiral Perturbation Theory
Abstract
We have completed the meson-meson scattering calculation within Chiral Perturbation Theory at one-loop, for all amplitudes involving pions, kaons and the eta. We have generalized the dispersive approach leading to the coupled channel version of the inverse amplitude method, which is then used to unitarize the chiral amplitudes. These unitary amplitudes now have the correct analytical structure in terms of cuts and poles. In this way we obtain a remarkably good description of meson-meson scattering up to 1.2 GeV, generating dynamically seven resonant states (rho, K*, sigma, f0,a0, etc...) The use of the complete one loop chiral amplitudes also ensures a simultaneously correct low energy description and a direct and successful comparison with the renormalized chiral parameters of plain ChPT.