Search for D0D0bar Mixing and a Measurement of the Doubly Cabibbo-suppressed Decay Rate in D0 -> K pi Decays

Abstract

We present results of a search for $D^0$-$\bar{D}{}^0$~mixing and a measurement of $R_{\mathrm{D}}$, the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays, based on an analysis of $D^0\to K^{+}{\pi }^{-}$ decays in 57.1~${fb}^{-1}$ of data collected at or just below the ${\rm Y}(4S)$ resonance with the {\slshape BABAR} detector at the PEP-II collider. Our results are compatible with no mixing and no $CP$ violation. At the 95% C.L., allowing for CP violation, we find the mixing parameters ${x^{\prime }}^2<0.0022$ and $-0.056<y^{\prime }<0.039$, and the mixing rate $R_{\mathrm{M}}<0.16$. In the limit of no mixing, $R_{\mathrm{D}}=(0.357\pm 0.022(stat.)\pm 0.027(syst.))$ and the $CP$~violating asymmetry \mbox{$A_{\mathrm{D}}=0.095\pm 0.061(stat.)\pm 0.083(syst.)$.}

7 pages, 3 postscript figures, submitted to Physical Review Letters

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