Pion and Kaon Vector Form Factors: a Chiral Unitary Approach

Abstract

The pion and kaon coupled-channel vector form factors are described by making use of the resonance chiral Lagrangian results together with a suitable unitarization method in order to take care of the final state interactions. A very good reproduction of experimental data is accomplished for the vector form factors up to $\sqrt{s}\le 1.2$ GeV and for the $\pi \pi$ P-wave phase shifts up to $\sqrt{s}\le 1.5$ GeV.

Comments: 4 pages, 2 figures, talk given at MESON 2000, Cracow, Poland, May 19-23, 2000