Natural $Z'$ model with an inverse seesaw and leptonic dark matter
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.
Cite
@article{arxiv.1207.3250,
title = {Natural $Z'$ model with an inverse seesaw and leptonic dark matter},
author = {Lorenzo Basso and Oliver Fischer and J. J. van der Bij},
journal= {arXiv preprint arXiv:1207.3250},
year = {2013}
}
Comments
29 pages, 9 figures. RGE section moved to appendix and other minor corrections applied to matched published version