ExploringCPviolation withBd0→DKSdecays

We (re)examine CP violation in the decays $B_d^0\to {\mathrm{DK}}_S,$ where D represents $D^0,\overline{D^0},$ or one of their excited states. The quantity ${\sin }^2(2\mathrm{}\beta +\gamma )$ can be extracted from the time-dependent rates for $B_d^0\mathrm{}\left(t\right)\mathrm{}\to D^{**0}{K}_S$ and $B_d^0\mathrm{}\left(t\right)\mathrm{}\to D^{**0}{K}_S,$ where the $D^{**0}$ decays to $D^{\left(*\right)+}{\pi }^{-}.$ If one considers a non-CP-eigenstate hadronic final state to which both $\overline{D^0}$ and $D^0$ can decay (e.g., $K^{+}{\pi }^{-}),$ then one can obtain two of the angles of the unitarity triangle from measurements of the time-dependent rates for $B_d^0\mathrm{}\left(t\right)\mathrm{}\to {(K}^{+}{\pi }^{-}{)}_D{K}_S$ and $B_d^0\mathrm{}\left(t\right)\mathrm{}\to {(K}^{-}{\pi }^{+}{)}_D{K}_S.$ There are no penguin contributions to these decays, so all measurements are theoretically clean.