Phys. Rev. Lett. 84, 1393 - 1397 (2000)

First Observation of the Decay BJ/ψφK

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A. Anastassov et al. (CLEO Collaboration)
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Received 3 November 1999

We present the first observation of the decay BJ/ψφK. Using 9.6×106 BB̅ meson pairs collected with the CLEO detector, we have observed ten fully reconstructed BJ/ψφK candidates, whereas the estimated background is 0.5±0.2 event. We obtain a branching fraction of B(BJ/ψφK)  =  (8.8-3.0+3.5[stat]±1.3[syst])×10-5. This is the first observed B meson decay requiring the creation of an additional ss̅ quark pair.


©2000 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.84.1393
DOI: 10.1103/PhysRevLett.84.1393
PACS: 13.25.Hw, 12.38.Qk

* Permanent address: Yonsei University, Seoul 120-749, Korea.
Permanent address: University of Cincinnati, Cincinnati, OH 45221.
Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
§ Permanent address: University of Texas-Pan American, Edinburg, TX 78539.

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