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arXiv · 2110.09942

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

Hyun Min Lee·Jiseon Song·Kimiko Yamashita
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Abstract

We propose a model for the vector-like lepton to explain the small muon mass by a seesaw mechanism, based on lepton-specific 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.

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Hyun Min Lee, Jiseon Song, Kimiko Yamashita. 2021-11-08. Seesaw lepton masses and muon $g-2$ from heavy vector-like leptons. https://doi.org/10.1007/s40042-021-00339-0

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