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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Acknowledgements
The work is supported in part by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2019R1A2C2003738). This work of KY is supported by Brain Pool program funded by the Ministry of Science and ICT through the National Research Foundation of Korea (NRF-2021H1D3A2A02038697). The work of JS is supported by the Chung-Ang University Graduate Research Scholarship in 2020.
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Lee, H.M., Song, J. & Yamashita, K. Seesaw lepton masses and muon \(g-2\) from heavy vector-like leptons. J. Korean Phys. Soc. 79, 1121–1134 (2021). https://doi.org/10.1007/s40042-021-00339-0
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DOI: https://doi.org/10.1007/s40042-021-00339-0