The available data on the $D\overline{ D}$ and inclusive hadronic cross sections in the $\psi(3770)$ region from the BaBar, Belle, BES-II, CLEO and KEDR experiments have been analyzed assuming that systematic uncertainties on cross sections measured by different detectors are not correlated. Four theoretical models predicting the $\psi(3770)$ line shape were considered for the $D\overline{ D}$ channel. All of them gave satisfactory description of the data. The combined analysis of the $D\overline{ D}$ and inclusive hadronic channel was performed using the model based on the vector dominance approach and accounting for the contribution of the $\psi(2S)$ tail to the $D\overline{ D}$ cross section. The following values of the mass, total width, electron width and decay probability to the non-$D\overline{ D}$ states were obtained: $M=3779.8 \pm 0.6 ~\text{ MeV}, \Gamma=25.8 \pm 1.3 ~\text{ MeV} , \Gamma_{ ee}=196 \pm 18 ~\text{ eV}, \mathcal{ B}_{ nD\overline{ D}}=0.164 \pm 0.049$, where the errors quoted include both statistical and dominant systematic uncertainties.
Categories: hep-ph