Improved measurement of B0bar -> Ds-D+ and search for B0bar -> Ds+Ds- at Belle
Abstract
We reconstruct B0bar -> Ds-D+ decays using a sample of 275 million BBbar pairs recorded by the Belle experiment, and we measure the branching fraction to be [7.42 +- 0.23(stat) +- 1.36(syst)] x 10(-3). We also search for the related decay B0bar -> Ds+Ds-. We observe no statistically significant signal and set an upper limit on the branching fraction of 2.0 x 10(-4) at 90% C.L.
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