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Line shape of \psi(3770) in e^+e^-\to D\bar D · Around

2012

Line shape of \psi(3770) in e^+e^-\to D\bar D

Achasov, N. N., Shestakov, G. N.

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Interference phenomena observed in the $\psi(3770)$ resonance region in the reactions $e^+e^-$ $\to$ $ D\bar D$ are analyzed.

To avoid ambiguities in the determination of the $\psi(3770)$ resonance parameters, when analyzing data between the $D\bar D$ and $D\bar D\pi$ thresholds, the amplitudes satisfying the elastic unitarity requirement should be used.
In the lack of information on the $P$ wave of $D\bar D$ elastic scattering, the $\psi(3770)$ parameters, determined by fitting the $e^+e^-$ $\to $ $D\bar D$ data, can essentially depend on the model used for the total contribution of the resonance and background.
The selection of the models can be toughened by comparing their predictions with the relevant data on the shape of the $\psi(3770)$ peak in the non-$D\bar D$ channels $e^+e^-$ $\to $ $\gamma\chi_{c0}$, $J/\psi\eta$, $\phi\eta$, etc.

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