Measurement of branching fraction and CP asymmetries in B->D0(cp)K decays
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We present a preliminary study of $B^- \to D^0_{CP} π^-$ and $B^- \to D^0_{CP} K^-$ decays, with the $D^0_{CP}$ reconstructed in the CP-odd eigenstates $K_s π^0$, $K_s ω$, in the CP-even eigenstates $K^+ K^-$, $π^+ π^-$, and in the (non-CP) flavor eigenstate $K^\mp π^\pm$. Using a sample of about 382 million Y(4S) decays into BBbar pairs, collected with the BABAR detector operating at the PEP-II asymmetric-energy B Factory at SLAC, we measure the ratios of the branching fractions R_CP+- and the direct CP asymmetries A_CP+-. The results are:
R_CP- = 0.81 \pm 0.10 (stat) \pm 0.05 (syst)
R_CP+ = 1.07 \pm 0.10 (stat) \pm 0.04 (syst)
A_CP- = -0.19 \pm 0.12 (stat) \pm 0.02 (syst)
A_CP+ = 0.35 \pm 0.09 (stat) \pm 0.05 (syst)
17 pages, 15 postscript figures, contributed to Lepton Photon 2007
17 pages, 15 postscript figures, contributed to Lepton Photon 2007