Charged lepton electric dipole moments from TeV-scale right-handed neutrinos

Abstract

We study the connection between charged lepton electric dipole moments, dl(l = e,μ,τ), and see-saw neutrino-mass generation in a simple two-Higgs doublet extension of the Standard Model plus three right-handed neutrinos (RHN) Na, a = 1, 2, 3. For RHN with hierarchical masses and at least one with mass in the 10 TeV range, we obtain the upper bounds of |de| < 9 × 10−30 e-cm and |dμ| < 2 × 10−26 e-cm. Our scenario favours the normal mass hierarchy for the light neutrinos. We also calculated the cross section for e−e− → W−W− in a high luminosity collider with constraints from neutrinoless double beta decay of nuclei included. Among the rare muon-decay experiments we find that μ → eγ is most sensitive and the upper limit is <8 × 10−13.