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Electronic width of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3770</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> resonance interfering with the background
Methods for extracting the $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ decay width from the data on the reaction cross section ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}D\overline{D}$ are discussed. Attention is drawn to the absence of the generally accepted method for determining ${\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\psi}(3770){e}^{+}{e}^{\ensuremath{-}}}$ in the presence of interference between the contributions of the $\ensuremath{\psi}(3770)$ resonance and background. It is shown that …