Rare decaysB⁰→D^(*)+_sD^(*)−_sandB⁰_s→D^(*)+D^(*)−in perturbative QCD approach

Abstract

In decay modes $B^0 \\to D_s^{(*)+} D_s^{(*)-}$ and $B_s^0 \\to D^{(*)+}\nD^{(*)-}$, none of quarks in final states is the same as one of $B$ meson. They\ncan occur only via annihilation diagrams in the Standard Model. In the heavy\nquark limit, we try to calculate the branching ratios of these decays in\nperturbative QCD approach without considering the soft final state interaction.\nWe found branching ratios of $B^0 \\to D_s^{(*)+} D_s^{(*)-}$ are at the order\nof $ 10^{-5}$, and branching ratios of $B_s^0 \\to D^{(*)+} D^{(*)-}$ are of\n$10^{-3}$. Those decay modes will be measured in $B$ factories and LHC-b\nexperiments.\n