https://doi.org/10.1140/epjc/s10052-018-6093-5
Regular Article - Theoretical Physics
Z-pole test of effective dark matter diboson interactions at the CEPC
1
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
2
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
* e-mail: gaoyu@ihep.ac.cn
Received:
3
July
2018
Accepted:
21
July
2018
Published online:
3
August
2018
We investigate the projected sensitivity to effective dark matter (DM)–diboson interaction during the high luminosity Z-pole and 240 GeV runs at the proposed Circular Electron Positron Collider (CEPC). The proposed runs at the 91.2 GeV 
center of mass energy offers an interesting opportunity to probe effective dark matter couplings to the Z boson, which can be less stringently tested in non-collider searches. We investigate the prospective sensitivity for dimension 6 and dimension 7 effective diboson operators to scalar and fermion dark matter. These diboson operators can generate semi-visible Z boson decay, and high missing transverse momentum mono-photon signals that can be test efficiently at the CEPC, with a small and controllable Standard Model 
background. Projected sensitivities for the effective 
coupling efficient 
for scalar DM, 
for fermion DM are obtain for 25 
and 
Z-pole luminosities assuming the optimal low dark matter mass range. We also compare the CEPC sensitivities to current direct and indirect search limits on these effective DM-diboson operators.
© The Author(s), 2018
