Renormalization and Factorization Scale-Invariant Predictions for the $e^{+}{e}^{-}\to J/\psi +{\eta }_c$ process at $B$ factories

Si-Qi Gong, Ting Sun, Sheng-Quan Wang +4

We perform a NNLO perturbative QCD analysis for exclusive double charmonium production $e^{+}{e}^{-}\to J/\psi +{\eta }_c$ within the NRQCD factorization formalism using the Principle of Maximum C…