Abstract
The leptophilic weakly interacting massive particle (WIMP) is realized in a minimal renormalizable model scenario where scalar mediators with lepton number establish the WIMP interaction with the standard model (SM) leptons. We perform a comprehensive analysis for such a WIMP scenario for two distinct cases with an SU(2) doublet or singlet mediator considering all the relevant theoretical, cosmological and experimental constraints at present. We show that the mono-photon search at near-future lepton collider experiments (ILC, FCC-ee, CEPC, etc.) can play a significant role to probe the yet unexplored parameter range allowed by the WIMP relic density constraint. This will complement the search prospect at the near-future hadron collider experiment (HL-LHC). Furthermore, we discuss the combined model scenario including both the doublet and singlet mediator. The combined model is capable of explaining the long-standing muon (g-2) anomaly which is an additional advantage. We demonstrate that the allowed region for anomalous muon (g-2) explanation, which has been updated very recently at Fermi National Accelerator Laboratory, can also be probed at the future colliders which will thus be a simultaneous authentication of the model scenario.
Highlights
A weakly interacting massive particle (WIMP) has been one of the most accepted particle candidates for dark matter (DM) in the past few decades, as it can naturally explain the DM abundance in the current Universe through the standard thermal freeze-out mechanism [1,2]
We find that the International Linear Collider (ILC) can give a complementary detection prospect to the future high-luminosity LHC (HL-LHC) experiment for such a leptophilic WIMP
We considered two distinct model scenarios: each has three generations of scalar mediators, but the mediators in the first scenario are doublets under SM SUð2ÞL, while the other scenario has only singlet mediators under the SUð2ÞL symmetry of the SM
Summary
A weakly interacting massive particle (WIMP) has been one of the most accepted particle candidates for dark matter (DM) in the past few decades, as it can naturally explain the DM abundance in the current Universe through the standard thermal freeze-out mechanism [1,2]. We perform the same monophoton search analysis for the combined model, and find that the ILC-250 GeV can validate the parameter space that can explain the muon g − 2 anomaly. This is an interesting finding as the muon anomaly has persisted at the Fermilab [25] experiment, and the monophoton search at the ILC will provide an additional clue to the leptophilic WIMP.
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