Doublet-singlet model and unitarity

Abstract

We study the renormalizable singlet-doublet fermionic extension of the Standard Model. In this model, the new vector-like fermions couple to the gauge bosons and to the Higgs via new Yukawa couplings, that allow for nontrivial mixing in the new sector, providing a stable, neutral dark matter candidate. Approximate analytic formulae are given for the mass spectrum around the blind spots, where the dark matter candidate coupling to $h$ or $Z$ vanishes. We calculate the two particle scattering amplitudes in the model, impose the perturbative unitarity constraints and establish bounds on the Yukawa couplings.

10 pages, 7 figures, v2 typos corrected

References in corpus (5)

• Light custodians in natural composite Higgs models
• Dark Matter Search Results from the PICO-2L C${}_3$F${}_8$ Bubble Chamber
• Dark matter and Higgs boson physics
• Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications
• Electroweak Precision Constraints on Vector-like Fermions

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• Linking the pseudo-Dirac dark matter and radiative neutrino mass in a singlet doublet scenario
• Flavoured gauge extension of singlet-doublet fermionic dark matter: neutrino mass, high scale validity and collider signatures
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• Anatomy of singlet-doublet dark matter relic: annihilation, co-annihilation, co-scattering, and freeze-in
• Vector Dark Matter from the 5-Dimensional Representation of $SU(2{)}_L$
• Impact of conversion-driven processes on singlet-doublet Majorana dark matter relic
• Gravitational Wave Probe of Singlet-Doublet Dark Matter Induced Radiative Neutrino Mass
• Singlet-Doublet Self-interacting Dark Matter and Radiative Neutrino Mass