Observation of B0bar --> D0 K0bar and B0bar --> D0 K*0bar decays
Abstract
We report on a search for B0bar --> D0 K(*)0bar decays based on 85 106 BBar events collected with the Belle detector at KEKB. The B0bar --> D0 K0bar and B0bar --> D0 K*0bar decays have been observed for the first time with the branching fractions Br(B0bar --> D0 K0bar) = (5.0+1.3-1.2+- 0.6) 10-5 and Br(B0bar --> D0 K*0bar) = (4.8+1.1-1.0+- 0.5) 10-5. No significant signal has been found for the B0bar --> D*0 K(*)0bar and B0bar --> D(*)0bar K*0bar decay modes, and upper limits at 90% CL are presented.
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