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Non-Decoupling New Particles
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We initiate the study of a new class of beyond the Standard Model states that we call "Loryons." They have the defining characteristic of being non-decoupling, in the sense that their physical mass is dominated by a contribution from the vacuum expectation value of the Higgs boson. The stakes are high: the discovery of a Loryon would tell us that electroweak symmetry must be non-linearly realized in the effective field theory of the Standard Model. Loryons have their masses bounded from above by perturbative unitarity considerations and thus define a finite parameter space for exploration. After providing a complete catalog of Loryon representations under mild assumptions, we turn to examining the constraints on the parameter space from Higgs couplings measurements, precision electroweak tests, and direct collider searches. We show that most fermionic candidates are already ruled out (with some notable exceptions), while much of the scalar Loryon parameter space is still wide open for discovery.
Forward citations
Cited by 4 Pith papers
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Towards the HEFT-hedron: the complete set of positivity constraints at NLO
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Constraints on Loryons in a Two Higgs Doublet Model
In a two-Higgs-doublet model, neutral singlet scalar Loryons remain viable up to about 700 GeV, while charged Loryon representations are strongly constrained by unitarity and Higgs-to-diphoton measurements.
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High Energy Vector Boson Scattering in Four-Body Final States to Probe Higgs Cubic, Quartic, and HEFT interactions
With modified Higgs potentials, 2-to-4 vector boson scattering has unitarity violation scales around ten times lower than 2-to-3 scattering and can overtake its cross section at parton energies of a few TeV.
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Accuracy complements energy: electroweak precision tests at Tera-Z
Z-pole precision at a Tera-Z factory gives projected sensitivities to Higgs and gauge SMEFT operators that are competitive with, and complementary to, higher-energy runs such as WW and ZH.
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