Search forD0−D¯0Mixing and Branching-Ratio Measurement in the DecayD0→K+π−π0

Abstract

We analyze 230.4 fb−1 of data collected with the BABAR detector at the PEP-II e+e− collider at SLAC to search for evidence of D0−D¯0 mixing using regions of phase space in the decay D0→K+π−π0. We measure the time-integrated mixing rate RM=(0.023−0.014+0.018(stat.)±0.004(syst.))%, and RM<0.054% at the 95% confidence level, assuming CP invariance. The data are consistent with no mixing at the 4.5% confidence level. We also measure the branching ratio for D0→K+π−π0 relative to D0→K−π+π0 to be (0.214±0.008(stat.)±0.008(syst.))%.Received 2 August 2006DOI:https://doi.org/10.1103/PhysRevLett.97.221803©2006 American Physical Society