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Higgs trilinear coupling in the standard model effective field theory at the high luminosity LHC and the FCC-ee
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abstract
Motivated by the updated HL-LHC projections for Higgs pair production from ATLAS and CMS and by the release of the FCC-ee Feasibility Study, we critically revisit the sensitivity of the global SMEFT analysis to deformations of the Higgs self-coupling modifier $\kappa_3$. To this end, we quantify the impact of SMEFT operators modifying double Higgs production at the LHC and single Higgs production, including loop corrections, at the FCC-ee, and include Renormalisation Group Evolution throughout. We demonstrate that significantly improving on the legacy HL-LHC constraints on $\kappa_3$ at the FCC-ee is not possible without the $\sqrt{s}=365$ GeV run; that individual and marginalised determinations are similar at the HL-LHC while differing by up to a factor 3 at the FCC-ee; and that quadratic EFT corrections cannot be neglected. Overall, the combination of HL-LHC and FCC-ee data offers unique potential to pin down the Higgs self-coupling with $\sim$$15\%$ precision.
Forward citations
Cited by 4 Pith papers
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Tailored PDFs for New Physics searches
Using closure tests with W', Z', and coloron models, the paper shows that either excluding high-energy data or fitting PDFs jointly with SMEFT coefficients prevents new-physics signals from being absorbed into the pro...
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Could electron-top interactions spoil the measurement of the Higgs trilinear? -A quantitative estimate at future lepton colliders-
Electron-top four-fermion operators are constrained by FCC-ee fermion-pair measurements strongly enough that they do not spoil the ~17% one-sigma extraction of the Higgs trilinear coupling.
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