Measurement of Charm Meson Lifetimes

We report measurements of the $D^0$, $D^{+}$, and $D_s^{+}$ meson lifetimes using $3.7{\mathrm{fb}}^{-1\mathrm{}}$ of $e^{+}{e}^{-}$ annihilation data collected near the $\Upsilon \left(4S\right)$ resonance with the CLEO detector. The measured lifetimes of the $D^0$, $D^{+}$, and $D_s^{+}$ mesons are $408.5\pm {4.1}_{-3.4\mathrm{}}^{+3.5\mathrm{}}\mathrm{fs}$, $1033.6\pm {22.1}_{-12.7\mathrm{}}^{+9.9\mathrm{}}\mathrm{fs}$, and $486.3\pm {15.0}_{-5.1\mathrm{}}^{+4.9\mathrm{}}\mathrm{fs}$. The precisions of these lifetimes are comparable to those of the best previous measurements, and the systematic errors are very different. In a single experiment we find that the ratio of the $D_s^{+}$ and $D^0$ lifetimes is $1.19\pm 0.04$.