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

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

2007-07-31

arxiv.org/abs/0707.4609v1

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 7 figures, Contributed paper to Lepton Photon 2007

Scientific paper

A sample of 1.25x10^9 phi decays, collected with the KLOE detector at the Frascati phi-factory DAFNE at center of mass energy ~ Mphi, has been used to study the radiative decay phi to eta pi0 gamma. This decay is dominated by phi to a0(980) gamma. Two decay chains, corresponding to eta to gamma gamma and eta to pi+ pi- pi0, have been selected. We found respectively: Br(phi to eta pi0 gamma)=(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 distributions have been fitted to obtain the relevant a0(980) parameters.

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