Pure Leptonic Gauge Symmetry, Neutrino Masses and Dark Matter

TL;DR

This paper explores an extension of the Standard Model with a local lepton number gauge symmetry, leading to neutrino masses via a modified Type-II seesaw and proposing right-handed neutrinos as dark matter candidates, with experimental constraints analyzed.

Contribution

It introduces a novel lepton number gauge symmetry extension with anomaly cancellation, neutrino mass generation, and dark matter candidate analysis.

Findings

Neutrinos acquire Majorana masses through the modified Type-II seesaw.

Right-handed Majorana neutrinos can serve as dark matter candidates.

Constraints from electroweak precision and dark matter relic abundance are satisfied.

Abstract

A possible extension of the Standard Model to include lepton number as local gauge symmetry is investigated. In such a model, anomalies are canceled by two extra fermions doublet. After leptonic gauge symmetry spontaneously broken, three active neutrinos may acquire non-zero Majorana masses through the modified Type-II seesaw mechanism. Constraints on the model from electro-weak precision measurements are studied. Due to the $Z_2$ discrete flavor symmetry, right-handed Majorana neutrinos can serve as cold dark matter candidate of the Universe. Constraint from dark matter relic abundance is calculated.