Neutrino dark matter candidate in fourth generation scenarios

Details Neutrino dark matter candidate in fourth generation scenarios Neutrino dark matter candidate in fourth generation scenarios

2011-05-17

arxiv.org/abs/1105.3490v3

Phys.Lett.B704:30-35,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to appear in PLB

Scientific paper

10.1016/j.physletb.2011.08.051

We overview the constraints on the 4th-generation neutrino dark matter candidate and investigate a possible way to make it a viable dark matter candidate. Given the LEP constraints tell us that the 4th-generation neutrino has to be rather heavy (> M_Z/2), in sharp contrast to the other three neutrinos, the underlying nature of the 4th-generation neutrino is expected to be different. We suggest that an additional gauge symmetry B-4L_4 distinguishes it from the Standard Model's three lighter neutrinos and this also facilitates promotion of the 4th-generation predominantly right-handed neutrino to a good cold dark matter candidate. It provides distinguishable predictions for the dark matter direct detection and the Large Hadron Collider experiments.

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