Measurement of the doubly Cabibbo suppressed decay $D^0\to K^{+}{\pi }^{-}$ and a search for charm mixing

Abstract

We present an analysis of the decay $D^0\to K^{+}{\pi }^{-}$ based on FOCUS data. From a sample of 234 signal events, we find a branching ratio of $\frac{\Gamma (D^0\to K^{+}{\pi }^{-})}{\Gamma (D^0\to K^{-}{\pi }^{+})}=(0.429_{-0.061}^{+0.063}\pm 0.027)$ under the assumptions of no mixing and no CP violation. Allowing for CP violation, we find a branching ratio of $(0.429\pm 0.063\pm 0.028)$ and a \textit{CP} asymmetry of $0.18\pm 0.14\pm 0.04$. The branching ratio for the case of mixing with no CP violation is $(0.381_{-0.163}^{+0.167}\pm 0.092)$. We also present limits on charm mixing.

As accepted by Physics Letters B

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• Search for D0-D0B Mixing
• A measurement of lifetime differences in the neutral D-meson system
• Cerenkov Particle Identification in FOCUS
• Limits on D0-D0bar Mixing and CP Violation from the Ratio of Lifetimes for Decay to K-pi+, K-K+, and pi-pi+
• The Target Silicon Detector for the FOCUS Spectrometer
• A Study of the Decay D0->K+pi-

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• Determination of the D0 -> K+pi- Relative Strong Phase Using Quantum-Correlated Measurements in e+e- -> D0 D0bar at CLEO
• Lessons from BaBar and Belle measurements of D-Dbar mixing parameters
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• Charm Meson Mixing: An Experimental Review
• Charm Decays Within the Standard Model and Beyond
• Renaissance of the ~1 TeV Fixed-Target Program
• D0D0bar Quantum Correlations, Mixing, and Strong Phases
• A Future High Statistics Charm Mixing Experiment Using the Fermilab Tevatron
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