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

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 $\mathcal{O}(10)-\mathcal{O}(1000)\mathrm{GeV}$ 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 $\mathcal{O}(10)-\mathcal{O}(1000)\mathrm{GeV}$ can be fully probed by the future experimental searches at the HL-LHC and the lepton colliders at their early stages.

Comments: minor corrections with references added, 17 pages, 9 figures