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Dark Radiation Confronting LHC in Z' Models
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Recent cosmological data favour additional relativistic degrees of freedom beyond the three active neutrinos and photons, often referred to as "dark radiation". Extensions of the SM involving TeV-scale Z' gauge bosons generically contain superweakly interacting light right-handed neutrinos which can constitute this dark radiation. In this letter we confront the requirement on the parameters of the E6 Z' models to account for the present evidence of dark radiation with the already existing constraints from searches for new neutral gauge bosons at LHC7.
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Observing Dirac neutrinos in the cosmic microwave background
Future CMB Stage IV measurements of N_eff will detect or exclude thermally populated right-handed neutrino partners in most Dirac-neutrino models, constraining new gauge bosons and scalar mediators more strongly than ...
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