Abelian extension of standard model with four generations

2011/09/30 by Debasish Borah
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dirac (video compression format) #Fermion #Gauge (firearms) #Higgs boson #Mass generation #Neutrino #Neutrino oscillation #Particle physics #Particle physics theoretical and experimental studies #Physics #Seesaw molecular geometry #Standard Model (mathematical formulation) #Sterile neutrino #Yukawa potential #hep-ph

paper · pdf · doi:10.1103/physrevd.85.015006

published as Phys. Rev. D 85, 015006 (2012) · 12 pages, 1 figure, Journal Version

arxiv created 2012/01/13 · openalex publication_date 2012/01/13 · arxiv updated 2012/01/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

An Abelian gauge extension of the standard model is proposed with a fourth generation. The fourth-generation fermions obtain their masses from a heavier Higgs doublet which makes no tree- level contributions to the first three generations' masses. Light first-three-generations' neutrino masses continue to have a type-I seesaw explanation, whereas the fourth-generation neutrino turns out to be a heavy Dirac neutrino. In the minimal version of such a model with no off-diagonal Yukawa couplings between the fourth and the first three generations, such a heavy Dirac neutrino can be long-lived on cosmological time scales. In this model, the stated LHC exclusion range 120 GeV<m_H<600 GeV on the lighter Higgs placed in the context of a generic fourth-generation standard model is evaded. Also, the Dirac fourth-generation neutrino in this model, if stable, would constitute up to 1% of the cold dark matter in the Universe.

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