Abstract
The fermionic Z-portal dark matter model suffers from severe constraints from direct detection experiments. However, a narrow parameter space around the Z-funnel region is beyond the reach due to the resonance annihilation. In this paper, we provide an intriguing collider prospect for probing the Z-funnel dark matter mass range at the future lepton colliders including the beam polarization feature. We have done a comprehensive analysis for mono-photon signal at the colliders for such a dark matter. A realistic estimation for the 90% C.L. constraints with the systematic beam uncertainties has also been provided.
Highlights
The discovery of the Higgs boson at the Large Hadron Collider (LHC) experiment completes the quest for the Standard Model (SM) [1,2]
We focus on a Majorana fermionic weakly interacting massive particles (WIMPs) dark matter (DM) that is singlet under the SM gauge group
We will discuss the capability of the future lepton colliders in searching the fermionic Z-portal WIMP based on our result obtained in the previous section
Summary
The discovery of the Higgs boson at the Large Hadron Collider (LHC) experiment completes the quest for the Standard Model (SM) [1,2]. Negligible interaction between the DM and the SM particles leads to too large DM relic abundance and conflicts with the current observation. One can further advantageously probe the WIMP in the collider, direct, and indirect detection experiments due to the interactions. The observed DM abundance and the constraints from the DM spindependent direct detection experiments have already excluded most of the parameter space, except for the Z-funnel region: m χ ≃ mZ=2. In the Z-funnel region, the coupling between the DM and Z boson can be small to explain the DM abundance in the present universe, and the constraints of the DM direct detection experiments are still weak.
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