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

TL;DR

This paper investigates the decay processes of vector-vector resonances into a photon and a pseudoscalar meson, highlighting the role of anomalous vertices and comparing theoretical predictions with experimental data.

Contribution

It introduces a novel approach to modeling these decays using anomalous terms, providing predictions that align well with observed data for certain resonances.

Findings

Good agreement with data for $K^{*+}(1430)$ decay

Predicted width for $K^{*0}(1430)$ smaller than experimental upper bound

Highlights importance of anomalous vertices in decay dynamics

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 $K^{*+}(1430)\to K^+\gamma$ and $K^{*0}(1430)\to K^0\gamma$ and find a good agreement with the data for the $K^{*+}(1430)$ case and a width considerably smaller than the upper bound measured for the $K^{*0}(1430)$ meson.