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

TL;DR

This paper reports precise measurements of the production cross sections for D meson pairs in electron-positron collisions at 3.773 GeV, providing insights into charm quark production near threshold.

Contribution

First measurement of D meson pair production cross sections at this energy using BES-II data, including radiative corrections and total hadronic cross section estimation.

Findings

Measured cross sections for $D^0 \bar{D}^0$ and $D^+ D^-$ production.

Obtained tree level cross sections after radiative corrections.

Estimated total hadronic cross section at 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 $\rm pb^{-1}$ 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.