Study of the a_0(980) meson via the radiative decay phi->eta pi^0 gamma with the KLOE detector

Details Study of the a_0(980) meson via the radiative decay phi->eta pi^0 gamma with the KLOE detector Study of the a_0(980) meson via the radiative decay phi->eta pi^0 gamma with the KLOE detector

2009-04-16

arxiv.org/abs/0904.2539v2

Phys.Lett.B681:5-13,2009

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, 6 figures, submitted to Physics Letters B. Corrected typos in eq.9

Scientific paper

10.1016/j.physletb.2009.09.022

We have studied the phi->a_0(980) gamma process with the KLOE detector at the Frascati phi-factory DAPhNE by detecting the phi->eta pi^0 gamma decays in the final states with eta->gamma gamma and eta->pi^+ pi^- pi^0. We have measured the branching ratios for both final states: Br(phi->eta pi^0 gamma)=(7.01 +/- 0.10 +/- 0.20)x10^-5 and (7.12 +/- 0.13 +/- 0.22)x10^-5 respectively. We have also extracted the a_0(980) mass and its couplings to eta pi^0, K^+ K^-, and to the phi meson from the fit of the eta pi^0 invariant mass distributions using different phenomenological models.

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