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We report the first reconstruction in hadron collisions of the suppresseddecays B^- -> D(-> K^+ pi^-)K^- and B^- -> D(-> K^+ pi^-)pi^-, sensitive to theCKM phase gamma, using data from 7 fb^-1 of integrated luminosity collected bythe CDF II detector at the Tevatron collider. We reconstruct a signal for theB^- -> D(-> K^+ pi^-)K^- suppressed mode with a significance of 3.2 standarddeviations, and measure the ratios of the suppressed to favored branchingfractions R(K) = [22.0 \pm 8.6(stat)\pm 2.6(syst)]\times 10^-3, R^+(K) =[42.6\pm 13.7(stat)\pm 2.8(syst)]\times 10^-3, R^-(K)= [3.8\pm 10.3(stat)\pm2.7(syst]\times 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 forB^- -> D(-> K^+ pi^-)pi^- decay are also reported.

Measurements of branching fraction ratios and CP-asymmetries in suppressed B^- -> D(-> K^+ pi^-)K^- and B^- -> D(-> K^+ pi^-)pi^- decays