The collider tests of a leptophilic scalar for the anomalous magnetic moments

TL;DR

This paper explores a leptophilic scalar with CP-violating couplings as a potential explanation for the muon and electron magnetic moment anomalies, and discusses how future collider experiments can test this hypothesis.

Contribution

It introduces a leptophilic scalar model with CP violation that can account for magnetic moment deviations and proposes experimental searches at future colliders to test this model.

Findings

A leptophilic scalar with 10-1000 GeV mass can explain magnetic moment anomalies.

Future collider experiments like HL-LHC, CEPC, and muon collider can fully probe this scalar.

Current EDM constraints are considered in the model analysis.

Abstract

We study the anomalous muon and electron magnetic moments by introducing a scalar with CP-violating Yukawa couplings to the lepton sector. By fitting these two magnetic moments with the recent experimental measurements, we find that such a leptophilic scalar in the mass range of $\mathcal{O}(10)- \mathcal{O}(1000 )\,\rm GeV$ can be a possible source for the current experimental deviations from the Standard Model (SM) predictions, with $\mathcal{O}(0.1) - \mathcal{O}(1)$ Yukawa couplings. The current electron and muon EDM constraints to the general CP-violating Yukawa couplings are discussed. We propose to search such a leptophilic scalar mediated at the future high-luminosity LHC (HL-LHC) runs, as well as the high-energy lepton colliders, including the CEPC and the muon collider. Our results show that the leptophilic scalar in the mass range of $\mathcal{O}(10)- \mathcal{O}(1000 )\,\rm GeV$ can be fully probed by the future experimental searches at the HL-LHC and the lepton colliders at their early stages.