Dalitz Analysis of D^0 --> K_S^0 pi+ pi-

TL;DR

This paper performs a Dalitz analysis of D^0 decays to K_S^0 pi+ pi- using CLEO data, identifying multiple resonant contributions and exploring effects like doubly Cabibbo suppressed decays and mixing.

Contribution

It provides a detailed measurement of the resonant substructure in D^0 --> K_S^0 pi+ pi- decays, including the first observation of a specific doubly Cabibbo suppressed component.

Findings

Identified ten resonant contributions in the decay.

Observed a K^{* +} pi^- component from suppressed decays or mixing.

Measured relative phases and amplitudes of decay components.

Abstract

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 in charged D^* decay. 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^{* +} pi^- component which arises from doubly Cabibbo suppressed decays or D^0 - {D^0}-bar mixing.