Meson form factors and the quark-level linear σ model

Abstract

The quark-level linear σ model (L σM) is employed to compute a variety of electromagnetic and weak observables of light mesons, including pion and kaon form factors and charge radii, charged-pion polarizabilities, semileptonic weak K ℓ3 decays, semileptonic weak radiative pion and kaon form factors, radiative decays of vector mesons, and nonleptonic weak K 2 π decay. The agreement of all these predicted observables with experiment is striking. In passing, the tight link between the L σM and vector-meson dominance is shown.