Abstract |
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We report a search for the decays B0 --> Ds- Ds+, B0 --> Ds*- Ds+,
B0 --> Ds*- Ds*+, in a sample of 232 million Upsilon(4S) decays to BBbar
pairs collected with the BABAR detector at the PEP-II asymmetric-energy
e+ e- storage ring. We find no significant signal and set upper
bounds for the branching fractions: Br(B0 --> Ds- Ds+) < 1.0 X 10^-4,
Br(B0 --> Ds*- Ds+) < 1.3 X 10^-4, and Br(B0 --> Ds*- Ds*+) <2.4 X 10^-4
at 90% confidence level.
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