Rare Decays B⁰ → Dₛ⁽*⁾⁺ Dₛ⁽*⁾⁻ and Bₛ⁰ → D⁽*⁾⁺ D⁽*⁾⁻ in Perturbative QCD Approach

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In decay modes B⁰ → Dₛ⁽*⁾⁺ Dₛ⁽*⁾⁻ and Bₛ⁰ → D⁽*⁾⁺ D⁽*⁾⁻, none of quarks in final states is the same as one of B meson. They can occur only via annihilation diagrams in the Standard Model. In the heavy quark limit, we try to calculate the branching ratios of these decays in perturbative QCD approach without considering the soft final state interaction. We found branching ratios of B⁰ → Dₛ⁽*⁾⁺ Dₛ⁽*⁾⁻ are at the order of 10⁻⁵, and branching ratios of Bₛ⁰ → D⁽*⁾⁺ D⁽*⁾⁻ are of 10⁻³. Those decay modes will be measured in B factories and LHC-b experiments.