Leptophilic fermion WIMP ~ Role of future lepton colliders

TL;DR

This paper investigates leptophilic WIMP models with scalar mediators, analyzing their detectability at future lepton colliders and their potential to explain the muon (g-2) anomaly, considering current theoretical and experimental constraints.

Contribution

It provides a comprehensive analysis of leptophilic WIMP models with SU(2) doublet or singlet mediators, highlighting the role of future lepton colliders in probing unexplored parameter space and explaining the muon (g-2) anomaly.

Findings

Future lepton colliders can effectively probe WIMP parameter space.

Combined mediator models can explain the muon (g-2) anomaly.

Collider searches complement hadron collider experiments.

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.