Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-04-03
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, Proceedings of the Fourth International Conference on B Physics & CP Violation
Scientific paper
We present preliminary results of several analyses searching for the effects of CP violation and mixing in the decay of $D^0$ mesons. We find no evidence of CP asymmetry in five different two-body decay modes of the $D^0$ to pairs of light pseudo-scalar mesons: $A_{CP}(K^+ K^-) = (+0.05 \pm 2.18 \pm 0.84)% $, $A_{CP}(\pi^+ \pi^-) = (+2.0 \pm 3.2 \pm 0.8)% $, $A_{CP}(K^0_{\rm S} \pi^0) = (+0.1 \pm 1.3)%$, $A_{CP}(\pi^0 \pi^0) = (+0.1 \pm 4.8)%$, and $A_{CP}(K^0_{\rm S} K^0_{\rm S}) = (-23 \pm 19)%$. We present the first measurement of the rate of wrong-sign $D^0 \to K^+ \pi^- \pi^0$ decay: $R = 0.0043^{+0.0011}_{-0.0010} \pm 0.0007$. We also describe a measurement of the mixing parameter $y_{CP}= {\Delta\Gamma\over 2 \Gamma}$ by searching for a lifetime difference between the CP neutral $K^{-}\pi^{+}$ final state and the CP even $K^+K^-$ and $\pi^+\pi^-$ final states. Under the assumption that CP is conserved we find $y_{CP} = -0.011 \pm 0.025 \pm 0.014$. Finally, we present our measurement of the \dstarp width: $96 \pm 4 \pm 22$~k$e$V.
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