Study of the a₀(980) meson via the radiative decay phi->eta pi⁰ gamma with the KLOE detector

KLOE collaboration: F. Ambrosino , A. Antonelli , M. Antonelli , F. Archilli , C. Bacci , P. Beltrame , G. Bencivenni , S. Bertolucci

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C. Bini C. Bloise S. Bocchetta F. Bossi P. Branchini P. Campana G. Capon T. Capussela F. Ceradini S. Chi G. Chiefari P. Ciambrone F. Crucianelli E. De Lucia A. De Santis P. De Simone G. De Zorzi A. Denig A. Di Domenico C. Di Donato B. Di Micco A. Doria M. Dreucci G. Felici A. Ferrari M. L. Ferrer S. Fiore C. Forti P. Franzini C. Gatti P. Gauzzi S. Giovannella E. Gorini E. Graziani W. Kluge V. Kulikov F. Lacava G. Lanfranchi J. Lee-Franzini D. Leone M. Martini P. Massarotti W. Mei S. Meola S. Miscetti M. Moulson S. M\"uller F. Murtas M. Napolitano F. Nguyen M. Palutan E. Pasqualucci A. Passeri V. Patera F. Perfetto M. Primavera P. Santangelo G. Saracino B. Sciascia A. Sciubba A. Sibidanov T. Spadaro M. Testa L. Tortora P. Valente G. Venanzoni R. Versaci R. Volpe G. Xu

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classification ✦ hep-ex

keywords gammaphi-detectoreta-finalkloemassmeson

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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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Study of the a₀(980) meson via the radiative decay phi->eta pi⁰ gamma with the KLOE detector

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