Measurement of the Branching Fractions and $C P$ Asymmetry of $B^{-} \to D_{(C P)}^{0} K^{-}$ Decays with theBABARDetector

We present a study of

B^{-} \to D_{C P}^{0} K^{-}

decays, where

D_{C P}^{0}

is reconstructed in

C P

-even channels, based on a sample of

88.8 \times 10^{6}

Υ (4 S) \to B \bar{B}

decays collected with the BABAR detector at the PEP-II

e^{+} e^{-}

storage ring. We measure the ratio of Cabibbo-suppressed to Cabibbo-favored branching fractions

B (B^{-} \to D_{C P}^{0} K^{-}) / B (B^{-} \to D_{C P}^{0} π^{-}) = [8.8 \pm 1.6 (stat) \pm 0.5 (syst)] \times 10^{- 2}

and the

C P

asymmetry

A_{C P} = 0.07 \pm 0.17 (stat) \pm 0.06 (syst)

. We also measure

B (B^{-} \to D^{0} K^{-}) / B (B^{-} \to D^{0} π^{-}) = [8.31 \pm 0.35 (stat) \pm 0.20 (syst)] \times 10^{- 2}

using a sample of

61.0 \times 10^{6}

B \bar{B}

pairs.

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Measurement of the Branching Fractions andCPAsymmetry ofB−→D(CP)0K−Decays with theBABARDetector