Dark Radiation Confronting LHC in Z' Models

Abstract

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.

11 pages, 4 figures

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• Robustness of cosmic neutrino background detection in the cosmic microwave background
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• Investigation of Gamow Teller Transition Properties in 56-64Ni Isotopes Using QRPA Methods
• Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E_6
• Sterile Neutrinos and B-L Symmetry