Tree level Majorana neutrino mass from Type-1 $\times$ Type-2 Seesaw mechanism with Dark Matter

TL;DR

This paper introduces a hybrid Seesaw model combining Type-1 and Type-2 mechanisms to generate Majorana neutrino masses at tree level, while also providing a dark matter candidate within a TeV-scale framework.

Contribution

It presents a novel multiplicative hybrid Seesaw model that links neutrino mass generation with dark matter stability through an extended gauge symmetry.

Findings

Neutrino masses arise from both Type-1 and Type-2 Seesaw mechanisms.

The model allows for new physics at the TeV scale detectable at LHC.

A stable dark matter candidate emerges from the residual symmetry.

Abstract

We propose a type of hybrid Seesaw model that combines Type-1 and Type-2 Seesaw mechanism in multiplicative way to generate tree level Majorana neutrino mass and provides a Dark Matter candidate. The model extends the Standard Model by extra gauge symmetry $U(1)_{D}$ and hidden sector consisted of chiral fermions and additional scalar fields. After spontaneous symmetry breaking, light neutrino masses are generated not only by exchange of the new heavy fermions as Type-1 Seesaw, but also by coupling to the naturally small induced vacuum expectation value of new heavy scalar as Type-2 Seesaw. An unbroken residue of $U(1)_{D}$ protects the lightest Dirac fermion required by anomaly cancellation in hidden sector from decaying, therefore giving rise to a Dark Matter candidate. Due to strong enough Seesaw suppression from our hybridization, new physics scale can be as low as TeV in this model and discovering signal from LHC data is possible in near future.