Dalitz Analysis ofD0→KS0π+π−

In $e^{+}{e}^{-}$ collisions using the CLEO detector, we have studied the decay of the $D^0$ to the final state $K_S^0{\pi }^{+}{\pi }^{-}$ with the initial flavor of the $D^0$ tagged by the decay $D^{*+}\to D^0{\pi }^{+}$. We use the Dalitz technique to measure the resonant substructure in this final state and clearly observe ten different contributions by fitting for their amplitudes and relative phases. We observe a $K^{*}(892{)}^{+}{\pi }^{-}$ component which arises from doubly Cabibbo suppressed decays or $D^0\mathrm{\text{−}}\overline{D^0}$ mixing.