Enhanced CP Violation with $\mathit{B}\to {\mathrm{KD}}^0\left({\overline{D}}^0\right)$ Modes and Extraction of the Cabibbo-Kobayashi-Maskawa Angle $\gamma$

The Gronau-London-Wyler method extracts the Cabibbo-Kobayashi-Maskawa angle $\gamma$ by measuring $B^{\pm }$ decay rates involving $D^0/{\overline{D}}^0$ mesons. CP violation can be greatly enhanced for decays to final states common to both $D^0$ and ${\overline{D}}^0$ that are not CP eigenstates. Large asymmetries are possible for final states $f$ such that $D^0\to f$ is doubly Cabibbo suppressed while ${\overline{D}}^0\to f$ is Cabibbo allowed. The measurement of interference effects in such modes allows the clean extraction of $\gamma$.