Higgs Coupling Measurements and the Scale of New Physics

Abstract

A primary goal of present and future colliders is measuring the Higgs couplings to Standard Model (SM) particles. Any observed deviation from the SM predictions for these couplings is a sign of new physics whose energy scale can be bounded from above by requiring tree-level unitarity. In this paper, we extend previous work on unitarity bounds from the Higgs cubic coupling to Higgs couplings to vector bosons and top quarks. We find that HL-LHC measurements of these couplings compatible with current experimental bounds may point to a scale that can be explored at the HL-LHC or a next-generation collider. Our approach is completely model-independent: we assume only that there are no light degrees of freedom below the scale of new physics, and allow arbitrary values for the infinitely many couplings beyond the SM as long as they are in agreement with current measurements. We also extend and clarify the methodology of this analysis, and show that if the scale of new physics is above the TeV scale, then the deviations can be described by the leading higher-dimension gauge invariant operator, as in the SM effective field theory.

48 pages, 17 figures, added discussion on basis dependence of unitarity bounds. Final published version in JHEP

References in corpus (6)

• LHC HXSWG interim recommendations to explore the coupling structure of a Higgs-like particle
• Unitarity Constraints on Dimension-Six Operators
• Unitarity Constraints on Dimension-six Operators II: Including Fermionic Operators
• Di-Higgs phenomenology: The forgotten channel
• Tree-level Interference in VBF production of Vh
• Tree-level Interference in VBF production of $Vh$

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• Bounds on Gauge Bosons Coupled to Non-conserved Currents
• Primary Observables for Top Quark Collider Signals
• The Scale of New Physics from the Higgs Couplings to $\gamma \gamma$ and $\gamma Z$
• Extracting Higgs Self-Coupling Constraints through Triple Higgs Boson Production at Future Hadron Colliders
• High Energy Vector Boson Scattering in Four-Body Final States to Probe Higgs Cubic, Quartic, and HEFT interactions
• Primary Observables for Electroweak Gauge Boson Collider Signals
• Positivity and partial wave unitarity bounds on ALP theories via amplitude methods
• Improved Bounds and Global Fit of Flavor-Violating Charged Lepton Yukawa Couplings post LHC
• Quantifying EFT Uncertainties in LHC Searches
• Novel and Updated Bounds on Flavor-Violating Z Interactions in the Quark Sector