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arXiv · 2102.08645

Leptophilic fermion WIMP ~ Role of future lepton colliders

Shun-ichi Horigome·Taisuke Katayose·Shigeki Matsumoto·Ipsita Saha
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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.

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Shun-ichi Horigome, Taisuke Katayose, Shigeki Matsumoto, Ipsita Saha. 2021-02-17. Leptophilic fermion WIMP ~ Role of future lepton colliders. https://doi.org/10.1103/physrevd.104.055001

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