Search for D0--anti-D0 Mixing and Branching-Ratio Measurement in the Decay D0 --> K+ pi- pi0

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  • 2 August 2006
Abstract
We present a search for D0--anti-D0 mixing using regions of phase space in which the rate of doubly Cabibbo-suppressed decays D0 --> K+ pi- pi0 relative to Cabibbo-favored decays D0 --> K- pi+ pi0 is reduced. We analyze 230.4 fb-1 of data collected with the BaBar detector at the PEP-II e+ e- collider at SLAC. We present results with and without the assumption of CP conservation. Assuming CP conservation, we measure the time-integrated mixing rate R_M = (0.023 +0.018/-0.014(stat.) +/- 0.004(syst.))%, and R_M < 0.054% at the 95% confidence level. We find that the data are consistent with no mixing at the 4.5% confidence level. Considering the entire allowed phase space, we measure the branching ratio for D0 --> K+ pi- pi0 relative to D0 --> K- pi+ pi0 to be (0.214 +/- 0.008(stat.) +/- 0.008(syst.))%.

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