Measurement of Charm Meson Lifetimes

Abstract

We report measurements of the ${D}^{0}$, ${D}^{+}$, and ${D}_{s}^{+}$ meson lifetimes using $3.7{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected near the $\ensuremath{\Upsilon}(4S)$ resonance with the CLEO detector. The measured lifetimes of the ${D}^{0}$, ${D}^{+}$, and ${D}_{s}^{+}$ mesons are $408.5\ifmmode\pm\else\textpm\fi{}{4.1}_{\ensuremath{-}3.4}^{+3.5}\mathrm{fs}$, $1033.6\ifmmode\pm\else\textpm\fi{}{22.1}_{\ensuremath{-}12.7}^{+9.9}\mathrm{fs}$, and $486.3\ifmmode\pm\else\textpm\fi{}{15.0}_{\ensuremath{-}5.1}^{+4.9}\mathrm{fs}$. 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 $1.19\ifmmode\pm\else\textpm\fi{}0.04$.