Charmonium decays into ${Lambda}_cbar{Lambda}_c$ pair governed by the hadronic loop mechanism

In this work, we investigate the open-charm decay process $psitoLambda_cbar{Lambda}_c$ via the hadronic loop mechanism for vector charmonia above $Lambda_cbar{Lambda}_c$ threshold. The branching ratios of these vector charmonium states to $Lambda_cbar{Lambda}_c$ are estimated. The charmonium explanation of the $Y(4630)$ observed in $e^+e^- to Lambda_cbar{Lambda}_c$ is tested. Furthermore, for the predicted higher vector charmonia above 4.7 GeV, the branching ratios $mathcal{B}[psi(nS)toLambda_cbar{Lambda}_c]$ with $n=7,8,9$ are found to be of the order of magnitude of $10^{-4}-10^{-3}$ while $mathcal{B}[psi(mD)toLambda_cbar{Lambda}_c]$ with $m=6,7,8$ are of the order of magnitude of $10^{-3}-10^{-2}$. The experimental signals of these missing charmonium states are discussed. The search for them may be an interesting topic in the future BESIII and Belle II experiments.