Study of the process e + e − → ωπ 0 with the KLOE detector The KLOE Collaboration
F. Ambrosino,A. Antonelli,M. Antonelli,F. Archilli,C. Bacci,P. Beltrame,G. Bencivenni,S. Bertolucci,C. Bini,C. Bloise,S. Bocchetta,V. Bocci,F. Bossi,P. Branchini,R. Caloi,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,S. Di Falco,B. Di Micco,A. Doria,M. Dreucci,G. Felici,A. Ferrari,M. L. Ferrer,G. Finocchiaro,S. Fiore,C. Forti,P. Franzini,C. Gatti,P. Gauzzi,S. Giovannella,E. Gorini,E. Graziani,M. Incagli,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,F. Scuri,I. Sfiligoi,T. Spadaro,M. Testa,L. Tortora,P. Valente,B. Valeriani,G. Venanzoni,R. Versaci,G. Xu
semanticscholar（2008）
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摘要
Using ∼ 600 pb collected with the KLOE detector at DAΦNE, we have studied the production cross section of ππππ and ππγ final states in ee collisions at center of mass energies between 1000 and 1030 MeV. By fitting the observed interference pattern around Mφ for both final states, we extract a measurement (preliminary) for the ratio Γ(ω → πγ)/Γ(ω → πππ) = 0.0934± 0.0022. Since these two final states represent the 98% of the ω decay channels, we use unitarity to derive BR(ω → πππ) = (89.94±0.23)% and BR(ω → πγ) = (8.40±0.19)%. Moreover, the parameters describing the ee → ππππ reaction around Mφ are used to extract the branching fraction for the OZI and G-parity violating φ→ωπ0decay: BR(φ→ ωπ) = (5.63 ± 0.70) × 10.
