Quasi-Dirac fermion: A source of neutrino mass and dark matter

TL;DR

This paper proposes that quasi-Dirac fermions, arising from neutral vectorlike fermions, can simultaneously generate neutrino masses and serve as dark matter candidates, with small mass splittings ensuring experimental consistency.

Contribution

It introduces a model where quasi-Dirac fermions from vectorlike states explain neutrino masses and dark matter stability through radiative mechanisms.

Findings

Quasi-Dirac fermions can generate small neutrino masses.

Small mass splitting suppresses neutrino mass and enables dark matter detection.

Model remains consistent with charged lepton flavor violation constraints.

Abstract

Neutral vectorlike fermion as inspired by unified theories might become quasi-Dirac states at TeV due to a violation in lepton-like symmetry. It is shown that such quasi-Dirac fermions can properly achieve radiative neutrino mass generation and dark matter stability. Indeed, the small splitting of quasi-Dirac masses, i.e. $\Delta M/M\ll 1$, suitably suppresses neutrino mass to be small in order to allow dark matter annihilation and detection to be appropriate to experiment as well as charged lepton flavor violation limit.