Natural $Z'$ model with an inverse seesaw and leptonic dark matter

TL;DR

This paper introduces a Z'-boson model with an inverse seesaw mechanism and leptonic dark matter, predicting potential collider signatures and leptogenesis possibilities.

Contribution

It proposes a novel model combining a Z'-boson with leptinos for neutrino masses and dark matter, including collider and cosmological implications.

Findings

Z'-boson and Higgs could be detected at LHC

Leptinos enable inverse seesaw neutrino masses

Model allows for leptogenesis with multiple leptino pairs

Abstract

We consider a model for a Z'-boson coupled only to baryon minus lepton number and hypercharge. Besides the usual right-handed neutrinos, we add a pair of fermions with a fractional lepton charge, which we therefore call leptinos. One of the leptinos is taken to be odd under an additional Z_2 charge, the other even. This allows for a natural (inverse) seesaw mechanism for neutrino masses. The odd leptino is a candidate for dark matter, but has to be resonantly annihilated by the Z'-boson or the Higgs-boson responsible for giving mass to the former. Considering collider and cosmological bounds on the model, we find that the Z'-boson and/or the extra Higgs-boson can be seen at the LHC. With more pairs of leptinos leptogenesis is possible.