Radiative decays involving f0(980) and a0(980) and mixing between low and high mass scalar mesons

We analyze the experimental data for ϕ→f0(980)γ, ϕ→a0(980)γ, f0(980)→γγ and a0(980)→γγ decay widths in a framework where f0(980) and a0(980) are assumed to be mainly qqq¯q¯ low mass scalar mesons and mixed with qq¯ high mass scalar mesons. Applied the vector meson dominance model (VDM), these decays amplitudes are expressed by coupling parameters B describing the S (qqq¯q¯ scalar meson)-V (vector meson)-V (vector meson) coupling and B′ describing the S′ (qq¯ scalar meson)-V-V coupling. Adopting the magnitudes for B and B′ as ∼2.8GeV−1 and ∼12GeV−1, respectively, the mixing angle between a0(980) and a0(1450) as ∼9°, and the mixing parameter λ01 causing the mixing between I=0qqq¯q¯ state and qq¯ state as ∼0.24GeV2, we can interpret these experimental data, consistently.