A pr 2 00 9 Study of the a 0 ( 980 ) meson via the radiative decay φ → ηπ 0 γ with the KLOE detector KLOE Collaboration
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,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. Müller,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,G. Xu
semanticscholar（2009）
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摘要
We have studied the φ → a0(980)γ process with the KLOE detector at the Frascati φ−factory DAΦNE by detecting the φ → ηπγ decays in the final states with η → γγ and η → πππ. We have measured the branching ratios for both final states: Br(φ → ηπγ) = (7.01 ± 0.10 ± 0.20) × 10 and (7.12 ± 0.13 ± 0.22) × 10 respectively. We have also extracted the a0(980) mass and its couplings to ηπ, KK, and to the φ meson from the fit of the ηπ invariant mass distributions using different phenomenological models.
