Fourth Generation Parity

Abstract

We present a very simple 4th-generation (4G) model with an Abelian gauge interaction under which only the 4G fermions have nonzero charge. The U(1) gauge symmetry can have a Z_2 residual discrete symmetry (4G-parity), which can stabilize the lightest 4G particle (L4P). When the 4G neutrino is the L4P, it would be a neutral and stable particle and the other 4G fermions would decay into the L4P leaving the trace of missing energy plus the standard model fermions. Because of the new symmetry, the 4G particle creation and decay modes are different from those of the sequential 4G model, and the 4G particles can be appreciably lighter than typical experimental bounds.

Version accepted for publication in PRL

References in corpus (10)

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• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
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• Dirac Neutrino Dark Matter
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Cited by in corpus (12)

• Co-genesis of Matter and Dark Matter with Vector-like Fourth Generation Leptons
• Radiative symmetry breaking at the Fermi scale and flat potential at the Planck scale
• Radiative Symmetry Breaking from Flat Potential in various U(1)' models
• Minimal Vector-like leptonic Dark Matter and Signatures at the LHC
• $g_{\mu }-2$ from Vector-Like Leptons in Warped Space
• Dark Two Higgs Doublet Model
• A Call for New Physics : The Muon Anomalous Magnetic Moment and Lepton Flavor Violation
• Hybrid dynamical electroweak symmetry breaking with heavy quarks and the 125 GeV Higgs
• Fourth generation Majorana neutrino, dark matter and Higgs physics
• Pair Production of New Heavy Leptons with $U(1{)}^{\prime }$ Charge at Linear Colliders
• Chiral heavy fermions in a two Higgs doublet model: 750 GeV resonance or not
• Gauged $L_e-L_{\mu }-L_{\tau }$ symmetry, fourth generation, neutrino mass and dark matter