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Methods for extracting the $\psi(3770)\to e^+e^-$ decay width from the dataon the reaction cross section $e^+e^-\to D\bar D$ are discussed. Attention isdrawn to the absence of the generally accepted method for determining$\Gamma_{\psi(3770)e^+e^-}$ in the presence of interference between thecontributions of the $\psi(3770)$ resonance and background. It is shown thatthe model for the experimentally measured $D$ meson form factor, whichsatisfies the requirement of the Watson theorem and takes into account thecontribution of the complex of the mixed $\psi(3770)$ and $\psi(2S)$resonances, allows uniquely determine the value of $\Gamma_{\psi(3770)e^+e^-}$by fitting. The $\Gamma_{\psi(3770)e^+ e^-}$ values found from the dataprocessing are compared with the estimates in the potential models.

Electronic width of the $\psi(3770)$ resonance interfering with the background