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arXiv · hep-ex/9908014

First Observation of the Decay $B \to J/ψϕK$

A. Anastassov·CLEO Collaboration
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Abstract

We present the first observation of the decay B->J/psi phi K. Using 9.6 million B meson pairs collected with the CLEO detector, we have observed 10 fully reconstructed B->J/psi phi K candidates, whereas the estimated background is 0.5+/-0.2 events. We obtain a branching fraction of Br(B->J/psi phi K) = (8.8+3.5/-3.0(stat)+/-1.3(syst))*10^-5. This is the first observed $B$ meson decay requiring the creation of an additional s sbar quark pair.

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A. Anastassov, CLEO Collaboration. 2000-02-24. First Observation of the Decay $B \to J/ψϕK$. https://doi.org/10.1103/physrevlett.84.1393

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