Analysis of nature of φ → γπη and φ → γπ0π0 decays

We study interference patterns in the φ → (γa0 + π0ρ) → γπη and φ → (γf0 + π0ρ) → γπ0π0 reactions. Taking into account the interference, we fit the experimental data and show that the background reaction does not distort the π0η spectrum in the decay φ → γπη everywhere over the energy region and does not distort the π0π0 spectrum in the decay φ → γπ0π0 when the invariant mass mπ0π0 > 670 MeV. We discuss the details of the scalar meson production in the radiative decays and note that there are conclusive arguments in favor of the one-loop mechanism φ → K+K- → γa0 (or γf0). We discuss also distinctions between the four-quark, molecular, and two-quark models and argue that the establishment of the scalar meson production mechanism in the φ radiative decays gives new strong evidence in favor of the four-quark nature of the scalar a0(980) and f0(980) mesons