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

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.))%.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00116840
Contributor : Dominique Girod <>
Submitted on : Tuesday, November 28, 2006 - 11:51:16 AM
Last modification on : Saturday, May 22, 2021 - 3:33:47 AM

### Citation

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, et al.. Search for $D^0-\bar{D}^0$ Mixing and Branching-Ratio Measurement in the Decay $D^0 \to K^+\pi^-\pi^0$. Physical Review Letters, American Physical Society, 2006, 97, pp.221803. ⟨10.1103/PhysRevLett.97.221803⟩. ⟨in2p3-00116840⟩

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