TeV-scale seesaw mechanism catalyzed by the electron mass

TL;DR

This paper proposes a TeV-scale seesaw model where neutrino masses are generated with right-handed neutrinos around TeV, predicting specific lepton-number and flavor violation signatures without collider effects.

Contribution

The model links neutrino masses to the electron mass scale and predicts observable lepton-flavor-violating processes at low energies.

Findings

Predicted lepton-number-violating process e- e- --> H- H-

Possible lepton-flavor-violating decay mu- --> e- e+ e-

Potential contribution to muon anomalous magnetic moment

Abstract

We construct a model in which the neutrino Dirac mass terms are of order the electron mass and the seesaw mechanism proceeds via right-handed neutrinos with masses of order TeV. In our model the spectra of the three light and of the three heavy neutrinos are closely related. Since the mixing between light and heavy neutrinos is small, the model predicts no effects in pp and p \bar p colliders. Possible signatures of the model are the lepton-number-violating process e- e- --> H- H-, where H- is a charged scalar particle, lepton-flavour-violating decays like mu- --> e- e+ e-, or a sizable contribution to the anomalous magnetic dipole moment of the muon.