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We report a study of the suppressed decays $B^- \to [K^+\pi^-]_D K^-$ and$B^- \to [K^+\pi^-]_D \pi^-$, where $[K^+\pi^-]_D$ indicates that the$K^+\pi^-$ pair originates from a neutral $D$ meson. These decay modes aresensitive to the Unitarity Triangle angle $\phi_3$. We use a data samplecontaining 275 million $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$resonance with the Belle detector at the KEKB asymmetric $e^+e^-$ storage ring.The signal for $B^- \to [K^+\pi^-]_D K^-$ is not statistically significant, andwe set a limit $r_B < 0.27$ at 90% confidence level, where $r_B$ is themagnitude of the ratio of amplitudes $| A(B^- \to \bar{D}^0K^-) / A(B^- \toD^0K^-) |$. We observe a signal with $6.4\sigma$ statistical significance inthe related mode, $B^- \to [K^+\pi^-]_D \pi^-$.Comment: 6 pages, 3 figures, 2 tables. Submitted to Phys. Rev. Let

physical review letters

Study of the Suppressed Decays<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mo stretchy="false">[</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msub><mml:mo stretchy="false">]</mml:mo><mml:mi>D</mml:mi></mml:msub><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>and<mml:math xmlns:mml="http…

Study of the Suppressed DecaysB−→[K+π−]DK−and