Study of the a(0)(980) meson via the radiative decay phi -> eta pi(0)gamma with the KLOE detector

We have studied the φ →a0(980)γ process with the KLOE detector at the Frascati φ-factory DANE by detecting the φ → ηπ0γ decays in the final states with η → γγ and η → π+π−π0. We have measured the branching ratios for both final states: Br(φ →ηπ0γ ) = (7.01 ± 0.10 ± 0.20) × 10−5 and (7.12 ± 0.13 ± 0.22) × 10−5, respectively. We have also extracted the a0(980) mass and its couplings to ηπ0, K+K−, and to the φ meson from the fit of the ηπ0 invariant mass distributions using different phenomenological models.