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A sample of 1.25x10^9 phi decays, collected with the KLOE detector at theFrascati phi-factory DAFNE at center of mass energy ~ Mphi, has been used tostudy the radiative decay phi to eta pi0 gamma. This decay is dominated by phito a0(980) gamma. Two decay chains, corresponding to eta to gamma gamma and etato pi+ pi- pi0, have been selected. We found respectively: Br(phi to eta pi0gamma)=(6.92 +/- 0.10 (stat.) +/- 0.20 (syst.))x10^(-5) and (7.19 +/- 0.17(stat.) +/- 0.24 (syst.))x 10 ^(-5). The eta pi0 invariant mass distributionshave been fitted to obtain the relevant a0(980) parameters.

Study of the radiative decay phi to a0(980) gamma with the KLOE detector