Observation of Ds+ K- and evidence for Ds+ pi- final states in neutral B decays
Abstract
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 106 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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