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Cabibbo-suppressed decays $B \to D^{(*)} K^-$ using a 10.4 fb$^{-1}$ datasample accumulated at the $\Upsilon(4S)$ resonance with the Belle detector atthe KEKB $e^+ e^-$ storage ring. The high-momentum particle identificationsystem of Belle is used to isolate signals for $B\to D^0 K^-$, $D^+K^-$,$D^{*0}K^-$ and $D^{*+}K^-$ from the $B\to D^{(*)}\pi^-$ decay processes whichhave much larger branching fractions. We report ratios of Cabibbo-suppressed toCabibbo-favored branching fractions of: ${\cal B}(B^- \to D^0 K^-)/{\cal B}(B^-\to D^0\pi^-) = 0.079\pm0.009\pm0.006$; ${\cal B}(\bar{B^0} \to D^+ K^-)/{\calB}(\bar{B^0} \to D^+\pi^-) = 0.068\pm0.015\pm0.007$; ${\cal B}(B^-\toD^{*0}K^-)/{\cal B}(B^-\to D^{*0}\pi^-) = 0.078 \pm 0.019 \pm 0.009$; and${\cal B}(\bar{B}^0\to D^{*+}K^-)/{\cal B}(\bar{B}^0\to D^{*+}\pi^-)= 0.074 \pm0.015 \pm 0.006$. The first error is statistical and the second is systematic.These are the first reported observations of the $B\to D^+K^-$, $D^{*0}K^-$ and$D^{*+}K^-$ decay processes.Comment: LaTeX, 12 pages, 2 figure

physical review letters

Observation of Cabibbo Suppressed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">D</mml:mi></mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mi>*</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:…

Observation of Cabibbo SuppressedB→D(*)K−