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arXiv · 1207.3250

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

Lorenzo Basso·Oliver Fischer·J. J. van der Bij
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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.

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Lorenzo Basso, Oliver Fischer, J. J. van der Bij. 2013-02-13. Natural $Z'$ model with an inverse seesaw and leptonic dark matter. https://doi.org/10.1103/physrevd.87.035015

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