Portals into Higgs vacuum stability

Abstract

We address the notorious metastability of the standard model (SM) and promote it to a model building task: What are the new ingredients required to stabilize the SM up to the Planck scale without encountering subplanckian Landau poles? Using the SM extended by vector-like fermions (VLFs), we chart out the corresponding landscape of Higgs stability. We find that the gauge portal mechanism, triggered by new SM charge carriers, opens up sizeable room for stability in a minimally invasive manner. We also find models with Higgs criticality, and Yukawa portals opening up at stronger coupling. Several models allow for VLFs in the TeV-range, which can be searched for at the LHC. For nontrivial flavor structure severe flavor-changing neutral current constraints arise which complement those from stability, and push lower fermion masses up to $\mathcal{O}(10^3\text{TeV})$.

18 pages, 16 figures. v2: match published version

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• Perturbative Asymptotic Safety and Its Phenomenological Applications
• The Two Scales of New Physics in Higgs Couplings
• Vacuum Stability in the one-loop approximation of a 331 Model
• Stability of the Standard Model Vacuum with Vector-Like Leptons: A Critical Examination
• Asymptotic safety in the Litim-Sannino model at four loops
• Higgs-portal dark matter from non-supersymmetric strings
• Scale symmetry breaking and generation of mass at quantum critical points
• The Two Scales of New Physics in Loop-Induced Higgs Couplings
• Stability of the Higgs Potential in the Standard Model and Beyond
• From Higgs physics to lepton flavour violation: current bounds and future prospects for vector-like lepton models
• Improving sensitivity of vectorlike top partner searches with jet substructure