Decay of vector-vector resonances into $\gamma$ and a pseudoscalar meson

Abstract

We study the decay of dynamically generated resonances from the interaction of two vectors into a $\gamma$ and a pseudoscalar meson. The dynamics requires anomalous terms involving vertices with two vectors and a pseudoscalar, which renders it special. We compare our result with data on $K^{\ast +}(1430)\to K^{+}\gamma$ and $K^{\ast 0}(1430)\to K^0\gamma$ and find a good agreement with the data for the $K^{\ast +}(1430)$ case and a width considerably smaller than the upper bound measured for the $K^{\ast 0}(1430)$ meson.