Optimized QCD two-loop correction to exclusive double $J/\psi$ production at B factories

Wen-Long Sang, Feng Feng, Yu Jia +3

We report the calculation of the process $e^{+}{e}^{-}\to J/\psi J/\psi$ up to next-to-next-to-leading order (NNLO) at a center-of-mass (CM) energy of $\sqrt{s}=10.58$ GeV. We employ an impro…