Seesaw lepton masses and muon g-2 from heavy vector-like leptons

초록

We propose a model for the vector-like lepton to explain the small muon mass by a seesaw mechanism, based on leptonspecific two Higgs doublet models with a local U(1)' symmetry. There is no bare muon mass for a nonzero U(1)' charge of the leptophilic Higgs doublet, so the physical muon mass is generated due to the mixing between the vector-like lepton and the muon after the leptophilic Higgs doublet and the dark Higgs get VEVs. In this scenario, the non-decoupling effects of the vector- like lepton give rise to leading contributions to the muon g - 2, thanks to the light Z' and the light dark Higgs boson. We discuss various constraints on the model from lepton flavor violation, electroweak precision and Higgs data, as well as collider searches.

키워드