Search for ${D}^{0}\mathrm{\text{\ensuremath{-}}}{\overline{D}}^{0}$ Mixing and Branching-Ratio Measurement in the Decay ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$

Search for $D^{0} − {\bar{D}}^{0}$ Mixing and Branching-Ratio Measurement in the Decay $D^{0} \to K^{+} π^{-} π^{0}$

B. Aubert et al. (BABAR Collaboration)

Phys. Rev. Lett. 97, 221803 – Published 30 November 2006

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 $D^{0} − {\bar{D}}^{0}$ mixing using regions of phase space in the decay $D^{0} \to K^{+} π^{-} π^{0}$ . We measure the time-integrated mixing rate $R_{M} = ({0.023}_{- 0.014}^{+ 0.018} (stat .) \pm 0.004 (syst .)) %$ , and $R_{M} < 0.054 %$ at the 95% confidence level, assuming $C P$ invariance. The data are consistent with no mixing at the 4.5% confidence level. We also measure the branching ratio for $D^{0} \to K^{+} π^{-} π^{0}$ relative to $D^{0} \to K^{-} π^{+} π^{0}$ to be $(0.214 \pm 0.008 (stat .) \pm 0.008 (syst .)) %$ .