Measurement of Cross Sections for $D^0{\bar{D}}^0$ and $D^{+}{D}^{-}$ Production in $e^{+}{e}^{-}$ Annihilation at $\sqrt{s}=3.773$ GeV

Abstract

The cross sections for $D^0{\bar{D}}^0$ and $D^{+}{D}^{-}$ production at 3.773 GeV have been measured with BES-II detector at BEPC. These measurements are made by analyzing a data sample of about 17.3 $\mathrm{p}{\mathrm{b}}^{-1}$ collected at the center-of-mass energy of 3.773 GeV. Observed cross sections for the charm pair production are radiatively corrected to obtain the tree level cross section for $D\bar{D}$ production. A measurement of the total tree level hadronic cross section is obtained from the tree level $D\bar{D}$ cross section and an extrapolation of the $R_{uds}$ below the open charm threshold.

7 pages, 2 figures, It was submitted to Physics Letters B in July, 2004