Lepton parameters in the see-saw model extended by one extra Higgs doublet

TL;DR

This paper explores how quantum effects in an extended Standard Model with an extra Higgs doublet and a right-handed neutrino can generate realistic lepton mass hierarchies and mixing angles from high-energy initial conditions.

Contribution

It demonstrates that radiative corrections in this extended model can produce observed lepton mass hierarchies and mixing patterns, starting from approximate rank-1 Yukawa couplings.

Findings

Quantum effects generate muon-tau mass hierarchy.

Mass splittings align with solar and atmospheric neutrino data.

Leptonic mixing angles match experimental observations.

Abstract

We investigate the radiative generation of lepton masses and mixing angles in the Standard Model extended by one right-handed neutrino and one extra Higgs doublet. We assume approximate rank-1 Yukawa couplings at a high energy scale and we calculate the one loop corrected charged lepton and neutrino mass matrices at the low energy scale. We find that quantum effects generate, for typical high energy parameters, a hierarchy between the muon and the tau mass, a hierarchy between the solar and the atmospheric mass splittings, and a pattern of leptonic mixing angles in qualitative agreement with experiments.