First Observation of the Decay $B\to J/\psi \varphi K$

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.

Changed to agree more closely with published version; 8 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

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