A possible simultaneous fit to the available $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ cross section data nearby $\psi (4660)$ by means of a strong correction to the Coulomb enhancement factor

Abstract

There are two available set of data on the $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ 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.

Comments: Found a bug in the present version of the work that lead to drawing incorrect conclusions in the discussion of the results