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Besides the conventional strong and electromagnetic decay modes, the$J/{\psi}$ particle can also decay via the weak interaction in the standardmodel. In this paper, nonleptonic $J/{\psi}$ ${\to}$ $D_{s,d}{\pi}$, $D_{s,d}K$weak decays, corresponding to the externally emitted virtual $W$ boson process,are investigated with the perturbative QCD approach. It is found that branchingratio for the Cabibbo-favored $J/{\psi}$ ${\to}$ $D_{s}{\pi}$ decay can reachup to ${\cal O}(10^{-10})$, which might be potentially measurable at the futurehigh-luminosity experiments.

$J/{\psi}$ ${\to}$ $D_{s,d}{\pi}$, $D_{s,d}K$ decays with perturbative QCD approach