2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42272Recent measurements of the Belle Collaboration of the exclusive production of two charmonia in the $e^+e^-$ annihilation differ substantially from theoretical predictions. Recently it was suggested that a significant part of this discrepancy can be explained by the process $e^2e^- --> 2J/psi$ and value for its cross-section was published. In this paper it is shown, that these results are incorrect and the values for the cross-sections of the production of different vector charmonia are presented.4 pages, 2 figures; minor changesHigh Energy Physics - Phenomenologytext