Dalitz Analysis of the Decay $D^{0}\to K^{-}\pi^{+}\pi^{0}$

TL;DR

This paper performs a detailed Dalitz plot analysis of the decay D0 to K- pi+ pi0, identifying key resonant contributions and measuring CP asymmetry with high statistical precision.

Contribution

It provides the first high-statistics measurement of the resonant substructure in D0 to K- pi+ pi0 decays, including amplitudes, phases, and CP asymmetry.

Findings

Dalitz plot well described by seven quasi-two-body decay channels

Measured CP asymmetry of -0.031 ± 0.086

Identified small non-resonant component

Abstract

We use data collected with the CLEO II detector to perform a high-statistics measurement of the resonant substructure in $D^0 \to K^-\pi^+\pi^0$ decays. We find the Dalitz Plot is well represented by a combination of seven quasi-two-body decay channels ($\bar{K}^{*0} \pi^0$, $K^- \rho$, $K^{*-} \pi^+$, $K^*_0(1430)^-\pi^+$, $\bar{K}^*_0(1430)^0 \pi^0$, $K^- \rho^+(1700)$, and $K^*(1680)^- \pi^+$), plus a small non-resonant component. Using the amplitudes and phases from this analysis, we calculate an integrated CP asymmetry of $-0.031 \pm 0.086$.