Study Of The A(0)(980) Meson Via The Radiative Decay Phi -> Eta Pi(0)Gamma With The Kloe Detector

F. Ambrosino, A. Antonelli, M. Antonelli,F. Archilli, C. Bacci,P. Beltrame,G. Bencivenni,S. Bertolucci, C. Bini,C. Bloise, S. Bocchetta, F. Bossi,P. Branchini, P. Campana,G. Capon, T. Capussela, F. Ceradini,S. Chi, G. Chiefari, P. Ciambrone,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. Mueller,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

PHYSICS LETTERS B（2009）

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摘要

We have studied the phi -> a(0)(980)gamma process with the KLOE detector at the Frascati phi-factory DA Phi NE 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) x 10(-5) and (7.12 +/- 0.13 +/- 0.22) x 10(-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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关键词

e(+)e(-) collisions,Scalar mesons,Rare phi decays

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