First Observation of the Decay B →J/ψϕK

CLEO Collaboration

Research output: Contribution to journalArticlepeer-review


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

Original languageEnglish (US)
Pages (from-to)1393-1397
Number of pages5
JournalPhysical review letters
Issue number7
StatePublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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