Recent Results From CLEO on D0-D0Bar Mixing, CP Violation in D0 Decays, and D*+ Width

Abstract

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: $A_{CP}(K^{+}{K}^{-})=(+0.05\pm 2.18\pm 0.84)$, $A_{CP}({\pi }^{+}{\pi }^{-})=(+2.0\pm 3.2\pm 0.8)$, $A_{CP}(K_{\mathrm{S}}^0{\pi }^0)=(+0.1\pm 1.3)$, $A_{CP}({\pi }^0{\pi }^0)=(+0.1\pm 4.8)$, and $A_{CP}(K_{\mathrm{S}}^0{K}_{\mathrm{S}}^0)=(-23\pm 19)$. We present the first measurement of the rate of wrong-sign $D^0\to K^{+}{\pi }^{-}{\pi }^0$ decay: $R=0.0043_{-0.0010}^{+0.0011}\pm 0.0007$. We also describe a measurement of the mixing parameter $y_{CP}=\frac{\Delta \Gamma }{2\Gamma }$ 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.

arXiv comment6 pages, Proceedings of the Fourth International Conference on B Physics & CP Violation