Leptonic CP violation from a vector-like lepton

Abstract

Leptonic CP violation is yet to be confirmed as an additional source of CP violation in fundamental interactions. We study the case where leptonic CP violation is spontaneous and is induced by the mixing with a heavy charged vector-like lepton (VLL). We show that the non-decoupling of this VLL is linked with the presence of CP violation and its coupling with the SM leptons are partly fixed from the SM Yukawas. Due to the large leptonic mixing angles, these couplings are typically of the same order and there is no flavor preference. Strong but not definitive constraints come from charged lepton flavor violating processes because the VLL can decouple from one or two leptonic flavors in very special points of parameter space. These special points are very sensitive to the neutrino Majorana phases.

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Cited by in corpus (8)

• Vector-like Singlet Quarks: a Roadmap
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• The Two Scales of New Physics in Higgs Couplings
• Explicit parametrization of more than one vector-like quark of Nelson-Barr type
• 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
• Leptonic CP violation from the seesaw
• Machine learning study on single production of a singlet vectorlike lepton at the Large Hadron Collider
• From Higgs physics to lepton flavour violation: current bounds and future prospects for vector-like lepton models