Impact on $\gamma {\varphi }_3$ from CLEO-c Using CP-tagged $D{\text{toK}}_{S,L}\pi \pi$ Decays

Precision determination of the CKM angle $\gamma \mathrm{/}{\varphi }_3$ depends upon constraints on charm mixing amplitudes, measurements of doubly-Cabibbo suppressed amplitudes and relative phases, and studies of charm Dalitz plots tagged by flavor or CP eigenstates. In this note we describe the technique used at CLEO-c to constrain the $K_{S,L}\pi \pi$ model uncertainty, and its impact on $\gamma \mathrm{/}{\varphi }_3$ measurements at B-factories presented at the Charm 2007 Workshop.