Neutrino Cosmology after WMAP 7-year data and LHC first Z′ bounds
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.
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.
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