Search for the W-exchange decays B0 --> Ds(*)- Ds(*)+
The BABAR Collaboration · Aubert, B.
Original · EN
We report a search for the decays B⁰ → Dₛ⁻ Dₛ⁺, B⁰ → Dₛ*⁻ Dₛ⁺, B⁰ → Dₛ*⁻ Dₛ*⁺ in a sample of 232 million Υ(4S) decays to pairs collected with the detector at the PEP-II asymmetric-energy e+ e- storage ring. We find no significant signal and set upper bounds for the branching fractions: B(B⁰ → Dₛ⁻ Dₛ⁺) < 1.0 × 10⁻⁴, B(B⁰ → Dₛ*⁻ Dₛ⁺) < 1.3 × 10⁻⁴ and B(B⁰ → Dₛ*⁻ Dₛ*⁺) < 2.4 × 10⁻⁴ at 90% confidence level.
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