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

Jaco ter Hoeve1, Luca Mantani2, Juan Rojo3,4, Alejo N. Rossia5, and Eleni Vryonidou6

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Phys. Rev. D 112, 013008 – Published 15 July, 2025

DOI: https://doi.org/10.1103/qtz8-bkd4

Abstract

Motivated by the updated high luminosity (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 standard model effective field theory (SMEFT) analysis to deformations of the Higgs self-coupling modifier κ3. 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 renormalization group evolution throughout. We demonstrate that significantly improving on the legacy HL-LHC constraints on κ3 at the FCC-ee is not possible without the s=365  GeV run; that individual and marginalized 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, especially at the (HL-)LHC. This finding fundamentally alters the picture compared to strategic planning often based on one-parameter projections. Overall, the combination of HL-LHC and FCC-ee data offers unique potential to pin down the Higgs self-coupling with ∼15% precision.

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Phys. Rev. D 112, 013008– Published 15 July, 2025
  • Received 11 April 2025
  • Accepted 24 June 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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