| Abstract |
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We report on our search for $\Bm \to D^{(*)+}_s K^- \pi^-$, $\Bzb \to D_s^{(*)+} \KS \pi^-$, and
$\Bm \to D^{(*)+}_s K^- K^-$ decays
in 383 million $\FourS \to B \Bbar$ events collected by the \babar\ detector at the \pep2\
asymmetric-energy $B$-factory.
The branching fractions are measured to be
${\cal B}(\Bm \to D^+_s K^- \pi^-) = (2.02 \pm 0.13_{stat} \pm 0.38_{syst}) \times 10^{-4},$
${\cal B}(\Bm \to D^{*+}_s K^- \pi^-)= (1.67 \pm 0.16_{stat} \pm 0.35_{syst}) \times 10^{-4},$
${\cal B}(\Bzb \to D_s^{+} \KS \pi^-)= (0.55 \pm 0.13_{stat} \pm 0.10_{syst}) \times 10^{-4},$ and
${\cal B}(\Bm \to D_s^{+} K^- K^-) = (0.11 \pm 0.04_{stat} \pm 0.02_{syst}) \times 10^{-4}$.
Upper limits at the 90$\%$ C.L. are set on
${\cal B}(\Bzb \to D_s^{*+} \KS \pi^-)< 0.55 \times 10^{-4}$ and
${\cal B}(\Bm \to D_s^{*+} K^- K^-) < 0.15 \times 10^{-4}.$
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