Explaining the muon g – 2 discrepancy by the two-Higgs-doublet model

Abstract

The anomalous magnetic dipole moment of muon (from now on called muon g – 2) is one of the precision measurements sensitive to new physics. Recent measurement, performed by the Muon g – 2 Collaboration of Fermilab, differs from the Standard Model (SM) value calculated by the Muon g – 2 Theory Initiative Group at the combined statistical significance of 5.1σ. Taking at face value, such discrepancy is caused by new physics. In this paper, we explain the discrepancy in the context of the two-Higgs-doublet model. We shall systematically classify every scenario that may induce muon g – 2. Their compatibility with relevant constraints, e.g. the oblique parameters and/or lepton-favor universality will also be discussed. We shall also show that the two-Higgs-doublet model can be extended to the Zee model, giving rise to radiative neutrino masses.