Next-to-Leading Order QCD Correction to ${\mathbf{e}}^{+}{\mathbf{e}}^{-}\to \mathbf{J}/\mathbf{\psi }+{\mathbf{\eta }}_{\mathbf{c}}$ at $\sqrt{s}=10.6$GeV}

Y. J. Zhang, Y. J. Gao, K. T. Chao

One of the most challenging open problems in heavy quarkonium physics is the double charm production in $e^{+}{e}^{-}$ annihilation at B factories. The measured cross section of $e^+ e^-…