A search for CP violation in and a Dalitz analysis of neutral D mesons decaying to pions, antipions, and neutral pions in CLEO II.V

Using the 9fb−1 data sample collected with the CLEO II.V detector at the Cornell Electron Storage Ring, we study the resonant substructure of the Cabibbo suppressed decay D 0 → π+π−π 0. We observe significant contributions from the ρ− π+, ρ+π−, ρ 0π0, and non-resonant channels, and present results of the amplitudes, phases, and fit fractions for these and other sub-modes. No significant evidence for the σ(500) or any other resonance was found. $ACP$ has been measured as $0.01+0.09-0.07$ ± 0.09.