Radiative decay of ρ0 and φ mesons in a chiral unitary approach

We study the ρ0 and φ decays into π+π−γ, π0π0γ and φ into π0ηγ using a chiral unitary approach to deal with the final state interaction of the MM system. The final state interaction modifies only moderately the large momenta tail of the photon spectrum of the ρ0→π+π−γ decay. In the case of φ decay the contribution to π+π−γ and π0π0γ decay proceeds via kaonic loops and gives a distribution of ππ invariant masses in which the f0(980) resonance shows up with a very distinct peak. The spectrum found for φ→π0π0γ decay agrees with the recent experimental results obtained at Novosibirsk. The branching ratio for φ→π0ηγ, dominated by the a0(980), is also in agreement with recent Novosibirsk results.