A gauge model for right handed neutrinos as dark matter

TL;DR

This paper proposes a simple extension of the electroweak symmetry with a $U(1)_{B-L}$ gauge group, where right-handed neutrinos gain mass and can serve as dark matter candidates, analyzing cosmological and collider constraints.

Contribution

It introduces a minimal $SU(2)_L imes U(1)_Y imes U(1)_{B-L}$ model linking neutrino masses and dark matter, with detailed cosmological and collider analysis.

Findings

Right-handed neutrinos can be viable dark matter candidates within this model.

Cosmological constraints restrict the parameter space of the $B-L$ symmetry breaking.

The $B-L$ current affects low-energy $e^+e^-$ scattering processes.

Abstract

$B-L$ is known to be a symmetry somewhat linked to the origin of neutrino masses, which turns out to be anomaly free upon the sole introduction of right handed neutrinos. We suggest a simple extension of the electroweak group, $SU(2)_L\times U(1)_Y\times U(1)_{B-L}$, where the breaking of $U(1)_{B-L}$ symmetry provides masses for right handed neutrinos at an acceptable range for them to be Dark Matter candidates. We review the cosmological constraints for this type of models, in order to find the restrictions on the parameters of the model. We study the contributions due to the $B-L$ current in the process $e^+e^- \rightarrow e^+e^-$ at low energies.