The "forbidden" decays of hybrid mesons to $πρ$ can be large

Abstract

The observation of $π_1(1600) \to πρ$ is shown in the flux-tube model to be compatible with this state being a hybrid meson with branching ratio to this channel $\sim 30%$. The $πρ$ widths of other hybrids are related by rather general arguments. These results enable cross sections for photoproduction of hybrids to be predicted.

Replaced with revised version correcting a technical mistake, conclusions remain unchanged. Accepted for publication in PRD