Abstract
We report results on the decay B−→DCPK− and its charge conjugate using a data sample of 85.4×106 BB¯ pairs recorded at the Υ(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 B(B−→D0K−)/B(B−→D0π−)=0.077±0.005(stat)±0.006(syst), B(B−→D1K−)/B(B−→D1π−)=0.093±0.018(stat)±0.008(syst) and B(B−→D2K−)/B(B−→D2π−)=0.108±0.019(stat)±0.007(syst) where the indices 1 and 2 represent the CP=+1 and CP=−1 eigenstates of the D0−D0 system, respectively. We find the partial-rate charge asymmetries for B−→DCPK− to be A1=0.06±0.19(stat)±0.04(syst) and A2=−0.19±0.17(stat)±0.05(syst). Received 23 April 2003DOI:https://doi.org/10.1103/PhysRevD.68.051101©2003 American Physical Society
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