THE ωρπ COUPLING IN THE VMD MODEL REVISITED

Abstract

We determine the value of the ω-ρ-π mesons coupling (gωρπ), in the context of the vector meson dominance model, from radiative decays, the ω→3π decay width and the e+e-→3π cross-section. For the last two observables we consider the effect of either a heavier resonance (ρ′(1450)) or a contact term. A weighted average of the results from the set of observables yields gωρπ = 14.7±0.1 GeV -1 in absence of those contributions, and gωρπ = 11.9 ± 0.2 GeV -1 or gωρπ = 11.7 ± 0.1 GeV -1 when including the ρ′ or contact term, respectively. The inclusion of these additional terms makes the estimates from the different observables to lay in a more reduced range. Improved measurements of these observables and the ρ′(1450) meson parameters are needed to give a definite answer on the pertinence of the inclusion of this last one in the considered processes.