Observation of Ds+ K- and evidence for Ds+ pi- final states in neutral B decays

Details Observation of Ds+ K- and evidence for Ds+ pi- final states in neutral B decays Observation of Ds+ K- and evidence for Ds+ pi- final states in neutral B decays

2002-07-25

arxiv.org/abs/hep-ex/0207077v3

Phys.Rev.Lett.89:231804,2002

Physics

High Energy Physics

High Energy Physics - Experiment

Accepted to publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.231804

We report the first observation of a B meson decay that is not accessible by a direct spectator process. The channel B0bar -> Ds+ K- is found in a sample of 85 timse 10^6 B Bbar events, collected with the Belle detector at KEKB, with a branching fraction Br(B0bar -> Ds+ K-)=(4.6^{+1.2}_{-1.1} +- 1.3) times 10^{-5}. We also obtain evidence for the B0 -> Ds+ pi- decay with branching fraction Br(B0 -> Ds+ pi-)=(2.4^{+1.0}_{-0.8} +- 0.7) times 10^{-5}. This value may be used to extract a model-dependent value of |Vub|.

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