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We perform a Dalitz plot analysis of D^+ -> K^-pi^+pi^+ decay with the CLEO-cdata set of 572 pb^-1 of e^+e^- collisions accumulated at the psi(3770). Thiscorresponds to 1.6 million D^+D^- pairs from which we select 140793 candidateevents with a small background of 1.1%. We compare our results with previousmeasurements using the isobar model. We modify the isobar model with improveddescription of some of the contributing resonances, and get better agreementwith our data. We also consider a quasi-model-independent approach and measurethe magnitude and phase of the contributing K pi S wave in the range ofinvariant masses from the threshold to the maximum in this decay. This gives animproved descriptions of our data over the isobar model. Finally we allow foran isospin-two pi^+pi^+ S-wave contribution, and find that adding this to boththe isobar model and quasi-model-independent approach gives the bestdescription of our data.

Dalitz plot analysis of the D^+ -> K^-pi^+pi^+ decay