Consequences of a Pati-Salam unification of the electroweak-scale active $\nu_R$ model

TL;DR

This paper explores a Pati-Salam unification model where electroweak-scale right-handed neutrinos are accessible experimentally, introducing sterile neutrinos with keV masses as dark matter candidates and predicting new gauge bosons potentially observable at colliders.

Contribution

It proposes a unified framework combining electroweak-scale right-handed neutrinos with Pati-Salam quark-lepton unification, predicting sterile neutrinos and new gauge bosons.

Findings

Sterile neutrinos with keV masses as warm dark matter candidates.

Potential detection of new W-like and Z-like gauge bosons at colliders.

Natural emergence of four fermion families in the model.

Abstract

If right-handed neutrinos are {\em not} singlets under the electroweak gauge group as it was proposed in a recent model, they can acquire electroweak scale masses and are thus accessible experimentally in the near future. When this idea is combined with quark-lepton unification \`{a} la Pati-Salam, one is forced to introduce new neutral particles which are singlets under the Standard Model (SM). These "sterile neutrinos" which exist in both helicities and which are different in nature from the popular particles with the same name can have their own seesaw with masses in the keV range for the lighter of the two eigenstates. The keV sterile neutrinos have been discussed in the literature as warm dark matter candidates with wide ranging astrophysical consequences such as structure formation, supernova asymetries, pulsar kicks, etc..In addition, the model contains W-like and Z-like heavy gauge bosons which might be accessible at the LHC or the ILC. An argument is presented on why, in this model, it is natural to have four families which can obey existing constraints.