Measurement of branching fraction ratios and CP asymmetries in $B^{\pm }\to D_{CP}{K}^{\pm }$

Abstract

We report results on the decay $B^{-}\to D_{CP}{K}^{-}$ and its charge conjugate using a data sample of 85.4 million $B\bar{B}$ pairs recorded at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric $e^{+}{e}^{-}$ storage ring. Ratios of branching fractions of Cabibbo-suppressed to Cabibbo-favored processes are determined to be $\mathcal{B}(B^{-}\to D^0{K}^{-})/\mathcal{B}(B^{-}\to D^0{\pi }^{-})=0.077\pm 0.005(stat)\pm 0.006(sys)$, $\mathcal{B}(B^{-}\to D_1{K}^{-})/\mathcal{B}(B^{-}\to D_1{\pi }^{-})=0.093\pm 0.018(stat)\pm 0.008(sys)$ and $\mathcal{B}(B^{-}\to D_2{K}^{-})/\mathcal{B}(B^{-}\to D_2{\pi }^{-})=0.108\pm 0.019(stat)\pm 0.007(sys)$ where the indices 1 and 2 represent the CP=+1 and CP=$-$1 eigenstates of the $D^0-\overline{D^0}$ system, respectively. We find the partial-rate charge asymmetries for $B^{-}\to D_{CP}{K}^{-}$ to be ${\mathcal{A}}_1=0.06\pm 0.19(stat)\pm 0.04(sys)$ and ${\mathcal{A}}_2=-0.19\pm 0.17(stat)\pm 0.05(sys)$.

10 pages, 3 figures, submitted to Physical Review D

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• A Measurement of the Branching Fraction for the Inclusive B --> X(s) gamma Decays with the Belle Detector
• Improving bounds on $\gamma$ in $B^{\pm }\to D{K}^{\pm }$ and $B^{\pm ,0}\to D{X}_s^{\pm ,0}$
• Measurement of Branching Fractions for B->ππ, Kπand KK Decays
• Observation of Cabibbo suppressed $B\to D^{(\ast )}{K}^{-}$ decays at Belle
• Studies of the Decay B+- -> D_CP K+-

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