Reanalysis of exclusive charmonium production at the $B$ factories
In this paper, we present a comprehensive analysis of the next-to-next-to-leading-order (NNLO) QCD corrections to the exclusive processes $e^{+}e^{-}\to J/\psi+\eta_{c}$, $e^{+}e^{-}\to J/\psi+\chi_{cJ}$, $e^{+}e^{-}\to \eta_{c}+\gamma$, and $e^{+}e^{-}\to \chi_{cJ}+\gamma$ $(J=0,1,2)$ at the $B$ factories, comparing p...