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

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arxiv 1207.3250 v2 pith:BEYVV656 submitted 2012-07-13 hep-ph

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

classification hep-ph
keywords bosonleptinosmodelchargedarkhiggs-bosoninverselepton
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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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