# Minimal inverse seesaw accompanied by Dirac fermionic dark matter

## TL;DR

This paper proposes a minimal inverse seesaw model with a $U(1)_{B-L}$ gauge symmetry that explains neutrino masses, dark matter, and baryon asymmetry through interconnected mechanisms involving seven neutral fermions.

## Contribution

It introduces a novel minimal inverse seesaw framework with anomaly cancellation, linking neutrino mass generation, Dirac fermionic dark matter, and baryogenesis within a unified $U(1)_{B-L}$ gauge symmetry.

## Key findings

- Two nonzero neutrino masses generated
- Stable Dirac fermion acts as dark matter
- Baryon asymmetry explained via additional seesaw mechanism

## Abstract

We present a minimal inverse seesaw mechanism by resorting to a $U(1)_{B-L}$ gauge symmetry. In order to cancel the gauge anomalies, we introduce seven neutral fermions among which four participate in the inverse seesaw to induce two nonzero neutrino mass eigenvalues, two forms a stable Dirac fermion to become a dark matter, while the last one keeps massless but decouples early. In this inverse seesaw, two neutral fermions are the usual right-handed neutrinos while the other two have a small Majorana mass term. An additional seesaw mechanism for generating these small Majorana masses also explains the cosmic baryon asymmetry in association with the sphaleron processes.