Neutrino Mass Seesaw Version 3: Recent Developments

TL;DR

This paper reviews the recent developments in the neutrino mass seesaw mechanism, focusing on the third version involving a heavy Majorana fermion triplet, including its theoretical basis and gauge extension.

Contribution

It provides a comprehensive overview of the third seesaw mechanism and recent progress, highlighting its theoretical framework and extensions.

Findings

Discussion of the U(1) gauge extension

Summary of recent theoretical developments

Comparison with previous seesaw versions

Abstract

The origin of neutrino mass is usually attributed to a seesaw mechanism, either through a heavy Majorana fermion singlet (version 1) or a heavy scalar triplet (version 2). Recently, the idea of using a heavy Majorana fermion triplet (version 3) has gained some attention. This is a review of the basic idea involved, its U(1) gauge extension, and some recent developments.