Ja n 20 09 Search for the K S → e + e − decay with the KLOE detector The KLOE Collaboration
F. Ambrosino,A. Antonelli,M. Antonelli,F. Archilli,P. Beltrame,G. Bencivenni,S. Bertolucci,C. Bini,C. Bloise,S. Bocchetta,F. Bossi,P. Branchini,P. Campana,G. Capon,D. Capriotti,T. Capussela,F. Ceradini,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,M. Dreucci,G. Felici,M. L. Ferrer,S. Fiore,P. Franzini,C. Gatti,P. Gauzzi,S. Giovannella,E. Graziani,W. Kluge,V. Kulikov,G. Lanfranchi,J. Lee-Franzini,D. Leone,M. Martini,P. Massarotti,S. Meola,S. Miscetti,M. Moulson,S. Müller,F. Murtas,M. Napolitano,F. Nguyen,M. Palutan,E. Pasqualucci,A. Passeri,V. Patera,F. Perfetto,P. Santangelo,B. Sciascia,A. Sciubba,A. Sibidanov,T. Spadaro,M. Testa,L. Tortora,P. Valente,G. Venanzoni,R. Versaci
semanticscholar（2009）
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摘要
We present the result of a direct search for the decay KS → e e, obtained with a sample of ee → φ → KSKL events produced at DAΦNE, the Frascati φ–factory, for an integrated luminosity of 1.9 fb. The search has been performed using a pure KS beam tagged by the simultaneous detection of a KL interaction in the calorimeter. Background rejection has been optimized by using both kinematic and particle identification cuts. We find BR(KS → e e) < 9× 10 at 90% CL, which improves by an order of magnitude on the previous best limit.
