Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-08-05
Phys.Rev.Lett.84:1393,2000
Physics
High Energy Physics
High Energy Physics - Experiment
Changed to agree more closely with published version; 8 pages postscript, also available through http://w4.lns.cornell.edu/pub
Scientific paper
10.1103/PhysRevLett.84.1393
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.
Anastassov A.
CLEO Collaboration
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