Probing New Physics in the Vector-like Lepton Model by Lepton Electric Dipole Moments

Abstract

We examine the lepton dipole moments in an extension of the Standard Model (SM), which contains vector-like leptons that couple only to the second-generation SM leptons. The model naturally leads to sizable contributions to the muon $g-2$ and the muon electric dipole moment (EDM). One feature of this model is that a sizable electron EDM is also induced at the two-loop level due to the existence of new vector-like leptons in the loops. We find parameter regions that can explain the muon $g-2$ anomaly and are also consistent with the experimental constraints coming from the electron EDM and the Higgs decay $h\to {\mu }^{+}{\mu }^{-}$. The generated EDMs can be as large as $O(10^{-22})e\cdot \mathrm{cm}$ for the muon and $O(10^{-30})e\cdot \mathrm{cm}$ for the electron, respectively, which can be probed in future experiments for the EDM measurements.

23 pages, 7 figures, version published in JHEP

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• Predictions for Muon Electric and Magnetic Dipole Moments from $h\to {\mu }^{+}{\mu }^{-}$ in Two-Higgs-Doublet Models with New Leptons
• A Large Muon EDM from Dark Matter
• The Two Scales of New Physics in Higgs Couplings
• An $SU(5)\times U(1{)}^{\prime }$ SUSY GUT with a "vector-like chiral" fourth family to fit all low energy data, including the muon $g-2$
• Exploring the Null Results in the Direct Detection Experiments, $(g-2{)}_{\ell }$ and Neutrino Mass in an Extended $U(1{)}_{L_{\mu }-L_{\tau }}$ Model Constrained through the $Z\to {\ell }^{+}{\ell }^{-}$ Decays
• From Higgs physics to lepton flavour violation: current bounds and future prospects for vector-like lepton models