Observation of KS0 semileptonic decays with the CMD-2 detector

R. R. Akhmetshin,E. V. Anashkin,M. Arpagaus,V. Aulchenko,V.Sh. Banzarov,L. M. Barkov,S. E. Baru,N.S. Bashtovoy,A. Bondar,D.V. Bondarev,A.V. Bragin,D. V. Chernyak,A. G. Chertovskikh,A.S. Dvoretsky,S. Eidelman,G. V. Fedotovich,N. Gabyshev,A. A. Grebeniuk,D. N. Grigoriev,P.M. Ivanov,S.V. Karpov,B. I. Khazin,I. A. Koop,L.M. Kurdadze,A.S. Kuzmin,I. B. Logashenko,P. Lukin,K.Yu. Mikhailov,I. N. Nesterenko,V.S. Okhapkin,E. A. Perevedentsev,A.S. Popov,T. A. Purlatz,N. Root,A.A. Ruban,N.M. Ryskulov,A. G. Shamov,Yu. M. Shatunov,A. I. Shekhtman,B. Shwartz,V. Sidorov,A.N. Skrinsky,V.P. Smakhtin,I. G. Snopkov,E. P. Solodov,P. Yu. Stepanov,A.I. Sukhanov,V.M. Titov,Yu.V. Yudin,S. G. Zverev,J. Thompson

Observation of KS0 semileptonic decays with the CMD-2 detector

1999

Abstract The decay K S 0 → πeν has been observed by the CMD-2 detector at the e + e − collider VEPP-2M at Novosibirsk. Of 6 million produced K L 0 K S 0 pairs, 75±13 events of the K S 0 → πeν decay were selected. The corresponding branching ratio is B( K S 0 → πeν )=(7.2±1.4)×10 −4 . This result is consistent with the evaluation of B( K S 0 → πeν ) from the K L 0 semileptonic rate and K S 0 lifetime assuming ΔS = ΔQ .

Keywords:

Collider
Particle physics
Nuclear physics
Detector
Physics
Branching fraction

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