Scalar and vector meson exchange in V→P0P0γ decays

The scalar contributions to the radiative decays of light vector mesons into a pair of neutral pseudoscalars, V→P0P0γ, are studied within the framework of the linear sigma model. This model has the advantage of incorporating not only the scalar resonances in an explicit way but also the constraints required by chiral symmetry. The experimental data on →π0π0γ, →π0ηγ, ρ→π0π0γ, and ω→π0π0γ are satisfactorily accommodated in our framework. Theoretical predictions for →K0K̄0γ, ρ→π0ηγ, ω→π0ηγ, and the ratio →f0γ/a0γ are also given. © 2006 The American Physical Society.