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A possible simultaneous fit to the available $e^+e^- \rightarrow \Lambda^+_c \bar{\Lambda}^-_c$ cross section data nearby $\psi(4660)$ by means of a strong correction to the Coulomb enhancement factor
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abstract
There are two available set of data on the $e^+e^- \rightarrow \Lambda^+_c \bar{\Lambda}_c^-$ cross section above threshold. The BELLE measurement, with ISR return, is compatible with the presence of a resonant state, called $\psi(4660)$ (formerly known as $Y(4660)$), observed also in other final states. The BESIII dataset has shown a different trend, with a flat cross section. We propose a new solution to fit both datasets by means of a strong correction to the Coulomb enhancement factor. Mass and width of the resonant state is extracted.
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