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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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arxiv 0904.2539 v2 pith:FBWYYZZ5 submitted 2009-04-16 hep-ex

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
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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