# Double type-II Dirac seesaw accompanied by Dirac fermionic dark matter

## TL;DR

This paper proposes a TeV-scale Higgs doublet model with a seesaw mechanism involving a $U(1)_{B-L}$ gauge symmetry, explaining neutrino masses, dark matter stability, and baryon asymmetry in a testable framework.

## Contribution

It introduces a double type-II Dirac seesaw model with a $U(1)_{B-L}$ gauge symmetry that links neutrino mass generation, dark matter stability, and baryon asymmetry.

## Key findings

- Predicts the existence of two right-handed neutrinos.
- Provides a mechanism for small Higgs mixing and baryon asymmetry.
- Suggests testable signatures at TeV-scale experiments.

## Abstract

A TeV-scale Higgs doublet with a small mixing to the standard model Higgs doublet can have the sizable Yukawa couplings to several right-handed neutrinos and the standard model lepton doublets. This provides a testable Dirac neutrino mass generation. We further consider a seesaw mechanism involving a $U(1)_{B-L}^{}$ gauge symmetry, which predicts the existence of two right-handed neutrinos and a stable Dirac fermionic dark matter, to simultaneously explain the small mixing between the two Higgs doublets and the generation of the cosmic baryon asymmetry.