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

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  • 6 August 2002
Abstract
We report on a search for the B0bar -> Ds+ K- and B0 -> Ds+ pi- decays based on 85 times 10^6 B Bbar events collected with the Belle detector at KEKB. The B0bar -> Ds+ K- decay is observed for the first time with the 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 the branching fraction Br(B0 -> Ds+ pi-)=(2.4^{+1.0}_{-0.8} +- 0.7) times 10^{-5}.

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