Weak phase γ from color-allowedB→DKrates

The ratios of partial rates for charged $B$ decays to the recently observed $D^{0}K$ mode and to the two $D_{\mathrm{CP}}K$ final states $(CP=\pm )$ are shown to constrain the weak phase $\gamma \equiv \mathrm{Arg}{(V}_{\mathrm{ub}}^{*}).\mathrm{}$ The smaller color-suppressed rate, providing further information about the phase, can be determined from these rates alone. Present estimates suggest that, while the first constraints can already be obtained in a high luminosity $e^{+}{e}^{-}$ $B$ factory, measuring the color-suppressed rate would require dedicated hadronic $B$ production experiments.