On double $1^{--}$ charmonium production through two-photon $\e^+ e^-$ annihilation at $\sqrt{s}=10.6 GeV$

Abstract

Recent 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.

Figures (2)

• Figure 1: QED diagrams for $e^+e^-\to2\gamma^*\to V_1V_2$
• Figure 2: Angular distribution for the process $e^+e^-\to2J/\psi$