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 449 x 106 BBbar pairs recorded by the Belle experiment, and measure the branching fraction to be Br(B0bar --> Ds-D+)=[7.5 +- 0.2(stat) +- 0.8(syst) +- 0.8(Br's)] x 10(-3). A search for the related decay B0bar --> Ds+Ds- is also performed. Since we observe no statistically significant signal an upper limit on the branching fraction is set at 3.6 x 10(-5) (90% C.L.).
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