D^0-${\bar{D}}^0$ Mixing and CP Violation from FOCUS Experiment

Abstract

Measurement results on $D^0$-${\bar{D}}^0$ mixing and CP violation are presented. FOCUS, a fixed target experiment at Fermilab, collected a high statistics photo-produced charm sample collected during the 96-97 run. We reconstructed more than 1 million charmed particles and compared the lifetimes of two $D^0$ meson decays to $K^{-}{\pi }^{+}$ and $K^{-}{K}^{+}$. The mixing parameter, $y_{\mathrm{cp}}$, we obtained is $(3.42\pm 1.39\pm 0.74)$. We also searched CP asymmetries in $D^{+}\to K^{-}{K}^{+}{\pi }^{+}$, $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decay modes. We did not see any evidence of CP violation by comparing the decay rates for particle and antiparticle.

4 pages, 2 figures, contributed to the XXX International Conference on High Energy Physics (ICHEP 2000), Osaka, Japan, 27 July - 2 August, 2000. revision: This revision fixes a few typos. Also added FOCUS collaborators as co-authors