First observation of the decay B --> J/psistraight phiK

We present the first observation of the decay B-->J/psistraight phiK. Using 9.6x10(6) B meson pairs collected with the CLEO detector, we have observed ten fully reconstructed B-->J/psistraight phiK candidates, whereas the estimated background is 0.5+/-0.2 event. We obtain a branching fraction...

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Published inPhysical review letters Vol. 84; no. 7; p. 1393
Main Authors Smith, JG, Alexander, JP, Baker, R, Bebek, C, Berger, BE, Berkelman, K, Blanc, F, Boisvert, V, V, Cassel, DG, Dickson, M, Drell, PS, Ecklund, KM, Ehrlich, R, Foland, AD, Gaidarev, P, Gibbons, L, Gittelman, B, Gray, SW, Hartill, DL, Heltsley, BK, Hopman, PI, Jones, CD, Kreinick, DL, Lohner, M, Magerkurth, A, Meyer, TO
Format Journal Article
LanguageEnglish
Published United States 14.02.2000
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Summary:We present the first observation of the decay B-->J/psistraight phiK. Using 9.6x10(6) B meson pairs collected with the CLEO detector, we have observed ten fully reconstructed B-->J/psistraight phiK candidates, whereas the estimated background is 0.5+/-0.2 event. We obtain a branching fraction of B(B-->J/psistraight phiK) = (8. 8(+3.5)(-3.0)[stat]+/-1.3[syst])x10(-5). This is the first observed B meson decay requiring the creation of an additional s quark pair.
ISSN:1079-7114