Two-loop-induced neutrino masses: A model-independent perspective

TL;DR

This paper provides a comprehensive, model-independent classification scheme for Majorana neutrino mass generation mechanisms occurring at the two-loop level, expanding understanding beyond one-loop models.

Contribution

It introduces a systematic, model-independent framework for classifying two-loop neutrino mass models, building on previous one-loop classifications.

Findings

Developed a general two-loop classification scheme

Cataloged possible two-loop neutrino mass models

Enhanced understanding of neutrino mass generation mechanisms

Abstract

We discuss Majorana neutrino mass generation mechanisms at the two-loop order. After briefly reviewing the systematic classification of one-loop realizations, we then focus on a general two-loop classification scheme which provides a model-independent catalog for neutrino mass models at the two-loop order