Search for the decay phi -> K0 K0bar gamma with the KLOE experiment

KLOE collaboration: F. Ambrosino , A. Antonelli , M. Antonelli , F. Archilli , P. Beltrame , G. Bencivenni , S. Bertolucci , C. Bini

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C. Bloise S. Bocchetta F. Bossi P. Branchini G. Capon T. Capussela F. Ceradini 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 M. Dreucci G. Felici S. Fiore P. Franzini C. Gatti P. Gauzzi S. Giovannella E. Graziani G. Lanfranchi J. Lee-Franzini M. Martini P. Massarotti S. Meola S. Miscetti M. Moulson S. M\"uller F. Murtas M. Napolitano F. Nguyen M. Palutan E. Pasqualucci A. Passeri V. Patera P. Santangelo B. Sciascia T. Spadaro M. Testa L. Tortora P. Valente G. Venanzoni R.Versaci G. Xu

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classification ✦ hep-ex

keywords gammak0bardecayeventsexperimentkloebackgroundcollected

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We have searched for the decay phi -> K0 K0bar gamma, by detecting K_s pairs plus a photon and with the K_s-mesons decaying to pi^+ pi^-, in a sample of about 1.5x 10^9 phi-decays collected by the KLOE experiment at DAFNE. The reaction proceeds through the intermediate states f_0(980) gamma, a_0(980) gamma. We find five events with 3.2 events expected from background processes. We obtain the upper limit: BR (phi -> K0 K0bar gamma) < 1.9x10^-8 at 90% C.L. .

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Search for the decay phi -> K0 K0bar gamma with the KLOE experiment

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