| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 8189412 | Physics Letters B | 2013 | 5 Pages |
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 Zâ² 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 E6Zâ² 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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Authors
A. Solaguren-Beascoa, M.C. Gonzalez-Garcia,