Title

First Observation of the Decay B →J/ψϕK

Document Type

Article

Publication Date

1-1-2000

Abstract

We present the first observation of the decay B →J/ψϕK Using 9.6 ×10 BB 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 [stat]±1.3[syst])×10 This is the first observed B meson decay requiring the creation of an additional ss quark pair. © 2000 The American Physical Society. 6 ¯ +3.5 −5 ¯ −3.0

Publication Name

Physical Review Letters

Volume Number

84

First Page

1393

Last Page

1397

Issue Number

7

DOI

10.1103/PhysRevLett.84.1393

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