The complementarity between chiral perturbation theory and the linear sigma model in the scalar channel is exploited to study π0π0 production in ρ and σ radiative decays, where the effects of a low mass scalar resonance σ (500) should manifest. The recently reported data on p → π0π0γ seem to require the contribution of a low mass and moderately narrow σ (500). The properties of this controversial state could be fixed by improving the accuracy of these measurements. Data on σ→ σ0σ0γ can also be accommodated in our framework, but are much less sensitive to the σ(500) properties. © 2001 Published by Elsevier Science B.V.
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 4 Oct 2001|