One-loop corrections to the processes $e^{+}{e}^{-}\to \gamma ,Z\to J/\psi {\eta }_c$ and $e^{+}{e}^{-}\to Z\to J/\psi J/\psi$

Abstract

The cross section values of $J/\psi {\eta }_c$ and $J/\psi J/\psi$ production in $e^{+}{e}^{-}$ annihilation are estimated within one-loop approximation near $Z$ pole, as well as at higher energies. Both intermediate bosons, $\gamma$ and $Z$, are taken into account. It is shown that at $Z$ mass the NLO contribution increases the cross-section values by 3.5 times.

In this version the quality of the text is improved as the manuscript was thoroughly proofread. The physical content remains the same

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