The complementarity between Chiral Perturbation Theory and the Linear Sigma Model in the scalar channel is exploited to study pi⁰ pi⁰ production in rho and omega radiative decays, where the effects of a low mass scalar resonance sigma (500) should manifest. The recently re-ported data on rho to pi⁰ ;pi⁰ gamma seem to require the contribution of a low mass and moderately narrow sigma (500). The properties of this controversial state could be fixed by improving the accuracy of these measurements. Data on omega to pi⁰ pi⁰ gamma can also be accommodated in our framework, but are much less sensitive to the sigma (500) properties.
A. et al. (Mon,) studied this question.