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Study of the process e+e- -> omega p0 with the KLOE detector

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arxiv 0707.4130 v2 pith:NCGIFHRO submitted 2007-07-27 hep-ex

Study of the process e+e- -> omega p0 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 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. M\"uller F. Murtas M. Napolitano F. Nguyen M. Palutan E. Pasqualucci A. Passeri V. Patera a f F. Perfetto M. Primavera P. Santangelo G. Saracino B. Sciascia A. Sciubba (1 6) F. Scuri I. Sfiligoi T. Spadaro M. Testa L. Tortora P. Valente B. Valeriani G. Venanzoni R. Versaci G. Xu
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classification hep-ex
keywords omegagammafinalstatesarounddecaydetectorextract
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Using ~600 pb-1 collected with the KLOE detector at DAPhiNE, we have studied the production cross section of pi+ pi- pi0 pi0 and p0p0 gamma final states in e+e- collisions at center of mass energies between 1000 and 1030 MeV. By fitting the observed interference pattern around Mphi for both final states, we extract a measurement (preliminary) for the ratio Gamma(omega -> pi0 gamma)/Gamma(omega -> pi+ pi- pi0) = 0.0934 +- 0.0022. Since these two final states represent the 98% of the omega decay channels, we use unitarity to derive BR(omega -> pi+pi-pi0)= (89.94 +- 0.23)% and BR(omega -> pi0 gamma) = (8.40 +- 0.19)%. Moreover, the parameters describing the e+e- -> pi+ pi- pi0 pi0 reaction around Mphi are used to extract the branching fraction for the OZI and G-parity violating phi -> omega pi0 decay: BR(phi -> omega pi0) = (5.63 +- 0.70) x 10^-5.

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