A possible simultaneous fit to the available $e^+e^- \rightarrow ��^+_c \bar��^-_c$ cross section data nearby $��(4660)$ by means of a strong correction to the Coulomb enhancement factor
التفاصيل البيبلوغرافية
العنوان:
A possible simultaneous fit to the available $e^+e^- \rightarrow ��^+_c \bar��^-_c$ cross section data nearby $��(4660)$ by means of a strong correction to the Coulomb enhancement factor
There are two available set of data on the $e^+e^- \rightarrow ��^+_c \bar��_c^-$ cross section above threshold. The BELLE measurement, with ISR return, is compatible with the presence of a resonant state, called $��(4660)$ (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. Found a bug in the present version of the work that lead to drawing incorrect conclusions in the discussion of the results
