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

First Observation of the Decay B → J/ψφK

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Milestone Letters: Discovery of the J/ψ

Abstract

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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 B→J/ψφK. Using 9.6×10⁶ BB̅ meson pairs collected with the CLEO detector, we have observed ten fully reconstructed B→J/ψφK candidates, whereas the estimated background is 0.5±0.2 event. We obtain a branching fraction of B(B→J/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.

URL: http://link.aps.org/abstract/PRL/v84/p1393
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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Phys. Rev. Lett. 84, 1393 - 1397 (2000)

First Observation of the Decay B → J/ψφK

PRL Celebrates 50 Years