Neutrino Cosmology after WMAP 7-year data and LHC first Z′ bounds
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Originally published in Physical Review Letters v.108 (2012): 081805. DOI: http://link.aps.org/doi/10.1103/PhysRevLett.108.081805”> 10.1103/PhysRevLett.108.081805.
Abstract
The gauge-extended U(1)C×SU(2)L×U(1)IR×U(1)L model elevates the global symmetries of the standard model (baryon number B and lepton number L) to local gauge symmetries. The U(1)L symmetry leads to three superweakly interacting right-handed neutrinos. This also renders a B-L symmetry nonanomalous. The superweak interactions of these Dirac states permit νR decoupling just above the QCD phase transition: 175≲TνRdec/MeV≲250. In this transitional region, the residual temperature ratio between νL and νR generates extra relativistic degrees of freedom at BBN and at the CMB epochs. Consistency with both WMAP 7-year data and recent estimates of the primordial 4He mass fraction is achieved for 3B-L/TeV<6. The model is fully predictive, and can be confronted with dijet and dilepton data from LHC7 and, eventually, LHC14.
Suggested Citation
Luis Alfredo Anchordoqui and Haim Goldberg. "Neutrino Cosmology after WMAP 7-year data and LHC first Z′ bounds" Physics Faculty Publications (2012).
Available at: http://works.bepress.com/hgoldberg/14