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

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30 November 2006

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 97 (22) , 221803
https://doi.org/10.1103/physrevlett.97.221803

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 .)) %

.

Keywords

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