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We reconstruct B0bar --> Ds-D+ decays using a sample of 449 x 10^6 BBbarpairs recorded by the Belle experiment, and measure the branching fraction tobe 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 weobserve no statistically significant signal an upper limit on the branchingfraction is set at 3.6 x 10^(-5) (90% C.L.).Comment: 7 pages, 2 figures, Submitted to Physical Review D, Rapid  Communication

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Improved measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>D</mml:mi><mml:mi>s</mml:mi><mml:mo>−</mml:mo></mml:msubsup><mml:msup><mml:mi>D</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>and search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mover accent="true…

Improved measurement ofB¯0→Ds−D+and search for