Electromagnetic Form Factors of Meson Transitions

Abstract

Within the Dyson-Schwinger equation approach to modeling QCD for meson physics, we present new results for $g_{\rho\pi\pi}$ and the coupling constants and form factors for the transitions $\gamma^\ast \pi \rho$ and $\gamma^\ast \pi^0 \gamma$. We discuss the role of the sub-dominant covariants of the $\pi$ Bethe-Salpeter amplitude and investigate the asymptotic behavior of the $\gamma^\ast \pi^0 \gamma$ form factor.