Measurements of branching fraction ratios and $CP$-asymmetries in suppressed ${B}^{-}\rightarrow D(\rightarrow{K}^{+}{\pi}^{-}){K}^{-}$ and ${B}^{-}\rightarrow D(\rightarrow{K}^{+} \pi^{-}){\pi}^{-}$ decays

We report the first reconstruction in hadron collisions of the suppressed decays B-→D(→K+π-)K- and B-→D(→K+π-)π-, sensitive to the Cabibbo-Kobayashi-Maskawa phase γ, using data from 7  fb-1 of integrated luminosity collected by the CDF II detector at the Tevatron collider. We reconstruct a signal for the B-→D(→K+π-)K- suppressed mode with a significance of 3.2 standard deviations, and measure the ratios of the suppressed to favored branching fractions R(K)=[22.0$\pm$8.6(stat)$\pm$2.6(syst)]×10-3, R+(K)=[42.6$\pm$13.7(stat)$\pm$2.8(syst)]×10-3, R-(K)=[3.8$\pm$10.3(stat)$\pm$2.7(syst)]×10-3 as well as the direct CP-violating asymmetry A(K)=-0.82$\pm$0.44(stat)$\pm$0.09(syst) of this mode. Corresponding quantities for B-→D(→K+π-)π- decay are also reported.

Duke Scholars

Author Alfred T. Goshaw Physics

Author Ashutosh V. Kotwal Physics

Author Mark C. Kruse Physics

Author Seog Oh Physics