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  • Open Access

Higgs Self-Coupling at the Future Circular e+e− Collider

Victor Maura1,*, Ben A. Stefanek2,†, and Tevong You1,‡

  • *Contact author: victor.maura_breick@kcl.ac.uk
  • †Contact author: bstefan@ific.uv.es
  • ‡Contact author: tevong.you@kcl.ac.uk
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Phys. Rev. Lett. 135, 141802 – Published 29 September, 2025

DOI: https://doi.org/10.1103/wjcy-1qk6

Abstract

Single Higgs production at FCC-ee probes the Higgs self-coupling at next-to-leading order (NLO). Extracting a bound requires a global analysis accounting for other possible new physics contributions up to NLO. We determine the FCC-ee sensitivity to Higgs self-coupling modifications δκλ within the standard model effective field theory framework, including for the first time flavor, LEP, LHC, and FCC-ee observables in a global analysis with all leading NLO effects via one-loop renormalization group evolution, as well as incorporating finite NLO contributions to electroweak precision and ZH observables. The global sensitivity to δκλ is estimated by marginalizing over the effects of all other operators, bringing flavor considerations to the fore. We find that, under reasonable assumptions, FCC-ee sensitivity to δκλ can exceed that of the HL-LHC.

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Phys. Rev. Lett. 135, 141802– Published 29 September, 2025
  • Received 16 April 2025
  • Accepted 24 July 2025
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