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In this paper we investigate the projected sensitivity to effective darkmatter (DM) - diboson interaction during the high luminosity $Z$-pole and 240GeV runs at the proposed Circular Electron Positron Collider (CEPC). Theproposed runs at the 91.2 GeV $e^+e^-$ center of mass energy offers aninteresting opportunity to probe effective dark matter couplings to the $Z$boson, which can be less stringently tested in non-collider searches. Weinvestigate the prospective sensitivity for dimension 6 and dimension 7effective diboson operators to scalar and fermion dark matter. These dibosonoperators can generate semi-visible $Z$ boson decay, and high missingtransverse momentum mono-photon signals that can be test efficiently at theCEPC, with a small and controllable Standard Model $\gamma\bar{\nu}\nu$background. A projected sensitivity for effective $\gamma Z$ coupling efficient$\kappa_{\gamma Z}< (1030$ GeV$)^{-3}$, $(1970$ GeV$)^{-3}$ for scalar DM,$\kappa_{\gamma Z}< (360$ GeV$)^{-3}$, $(540$ GeV$)^{-3}$ for fermion DM areobtain for 25 fb$^{-1}$ and 2.5 ab$^{-1}$ $Z$-pole luminosities assuming theoptimal low dark matter mass range. In comparison the effective DM-diphotoncoupling sensitivity $\kappa_{\gamma \gamma}< (590$ GeV$)^{-3}$ for scalar DM,$\kappa_{\gamma \gamma}< (360$ GeV$)^{-3}$ for fermion DM are also obtained fora 5 ab$^{-1}$ 240 GeV Higgs run. We also compare the CEPC sensitivities tocurrent direct and indirect search limits on these effective DM-dibosonoperators.

Z-pole test of effective dark matter diboson interactions at the CEPC