Higgs coupling measurements and the scale of new physics

Fayez Abu-Ajamieh (Laboratoire Univers et Particules de Montpellier, Universite de Montpellier, Rue Auguste Broussonnet, Montpellier, 34095, France) ; Spencer Chang (Department of Physics and Institute for Fundamental Science, University of Oregon, 1371 E 13th Ave, Eugene, Oregon, 97403, USA) ; Miranda Chen (Center for Quantum Mathematics and Physics (QMAP), University of California, Davis, 1 Shields Ave, Davis, CA, USA) ; Markus Luty (Center for Quantum Mathematics and Physics (QMAP), University of California, Davis, 1 Shields Ave, Davis, CA, USA)

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.

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Published on:
09 July 2021
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2021 (2021)
Issue 7
Pages 1-45
DOI:
https://doi.org/10.1007/JHEP07(2021)056
arXiv:
2009.11293
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: