Probing new physics in the vector-like lepton model by lepton electric dipole moments
Koichi Hamaguchi, Natsumi Nagata, Genta Osaki, Shih-Yen Tseng
Abstract
A bstract 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 → μ + μ − . The generated EDMs can be as large as $$ \mathcal{O} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math> (10 − 22 ) e ∙cm for the muon and $$ \mathcal{O} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math> (10 − 30 ) e ∙cm for the electron, respectively, which can be probed in future experiments for the EDM measurements.