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Theoretical constraints on models with vector-like fermions

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arxiv 2406.16050 v2 pith:X3QRX3QW submitted 2024-06-23 hep-ph

Amit Adhikary , Marek Olechowski , Janusz Rosiek , Michal Ryczkowski This is my paper · ORCID
classification hep-ph
keywords constraintselectroweakmodelscouplingsfermionsmodeltheoreticalvector-like
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We provide a set of theoretical constraints on models in which the Standard Model field content is extended by vector-like fermions and in some cases also by a real scalar singlet. Our approach is based on the study of electroweak vacuum stability, perturbativity of model couplings and gauge couplings unification with the use of renormalization group equations. We show that careful analysis of these issues leads to strong constraints on the parameter space of the considered models. This, in turn, has important implications for phenomenology, as we show using examples of the double Higgs boson production, electroweak precision observables, and the electroweak phase transition.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Towards UV-Models of Kinetic Mixing and Portal Matter VII: A Light Dark Photon in the $3_c3_L1_A1_B$ Model

    hep-ph 2024-12 conditional novelty 6.0 of 10

    In the 3c3L1A1B model, a single larger gauge force unifies part of the weak force with a dark force, producing a light dark photon, multi-TeV portal matter, and new heavy gauge bosons with testable signatures.

  2. The Two Scales of New Physics in Loop-Induced Higgs Couplings

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A deviation in the loop-induced Higgs couplings hgg, hγγ, or hZγ caused solely by new vectorlike fermions implies an upper bound on the mass scale of new bosons needed to restore perturbativity and vacuum stability.

  3. Portal Matter and Scotogenic-like Dirac Neutrino Masses

    hep-ph 2026-07 conditional novelty 5.0 of 10

    One-loop diagrams from dark-charged scalars and fermions in an E6-like portal matter model generate Dirac neutrino masses near 0.05 eV.

  4. Single production of singlet vector-like leptons at the ILC

    hep-ph 2024-12 conditional novelty 4.0 of 10

    Projected 5-sigma discovery regions for singlet vector-like leptons at the 1 TeV ILC are derived, covering masses 300-700 GeV and coupling kappa down to about 0.026.

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