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Branching Ratios of $B \to D_s K$ Decays in Perturbative QCD Approach

Cai-Dian Lu·Kazumasa Ukai
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Abstract

The rare decays $B^0 \to D_s^- K^+$ and $B^+ \to D_s^+ \bar{K}^0$ can occur only via annihilation type diagrams in the standard model. We calculate these decays in perturbative QCD approach. We found that the calculated branching ratio of $B^0 \to D_s^- K^+$ agreed with the data which had been observed in the KEK and SLAC $B$ factories. While the decay $B^+ \to D_s^+ \bar{K}^0$ has a very small branching ratio at ${\cal O}(10^{-8})$, due to the suppression from CKM matrix elements $|V_{ub}^* V_{cd}|$.

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Cai-Dian Lu, Kazumasa Ukai. 2002-10-15. Branching Ratios of $B \to D_s K$ Decays in Perturbative QCD Approach. https://doi.org/10.1140/epjc%2Fs2003-01150-4

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