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arXiv · 2504.05974

Higgs trilinear coupling in the standard model effective field theory at the high luminosity LHC and the FCC-ee

Jaco ter Hoeve·Luca Mantani·Juan Rojo·Alejo N. Rossia·Eleni Vryonidou
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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.

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Jaco ter Hoeve, Luca Mantani, Juan Rojo, Alejo N. Rossia, Eleni Vryonidou. 2025-04-08. Higgs trilinear coupling in the standard model effective field theory at the high luminosity LHC and the FCC-ee. https://arxiv.org/abs/2504.05974

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