Dalitz analysis of D0 → KS 0π+π-

In e + e - collisions using the CLEO detector, we have studied the decay of the D 0 to the final state K 0 S π + π - with the initial flavor of the D 0 tagged by the decay D* + → D 0 π + . 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) + π - component which arises from doubly Cabibbo suppressed decays or D 0 -D 0 mixing.