Electromagnetic Form Factors of Meson Transitions

Abstract

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