Journal
PHYSICS LETTERS B
Volume 719, Issue 1-3, Pages 121-125Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2012.12.065
Keywords
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Funding
- Spanish MICINN grant [FPA2010-20807]
- consolider-ingenio grant [CSD-2008-0037]
- CUR Generalitat de Catalunya grant [2009SGR502]
- USA-NSF grant [PHY-0653342]
- EU grant FP7 ITN INVISIBLES (Marie Curie Actions) [PITN-GA-2011-289442]
- ICREA Funding Source: Custom
- Division Of Physics
- Direct For Mathematical & Physical Scien [969739] Funding Source: National Science Foundation
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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 E-6 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. (c) 2013 Elsevier B.V. All rights reserved.
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