ECFA Higgs, electroweak, and top Factory Study

Abstract

The ECFA Higgs, electroweak, and top Factory Study ran between 2021 and 2025 as a broad effort across the experimental and theoretical particle physics communities, bringing together participants from many different proposed future collider projects. Activities across three main working groups advanced the joint development of tools and analysis techniques, fostered new considerations of detector design and optimisation, and led to a new set of studies resulting in improved projected sensitivities across a wide physics programme. This report demonstrates the significant expansion in the state-of-the-art understanding of the physics potential of future e+e- Higgs, electroweak, and top factories, and has been submitted as input to the 2025 European Strategy for Particle Physics Update.

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• Improving systematic uncertainties on precision two-body mass measurements
• Search for additional scalar bosons within the Inert Doublet Model in a final state with two leptons at the FCC-ee
• Deep-learning jet flavor tagging for precision hadronic Higgs measurements at future $e^{+}{e}^{-}$ Higgs factories
• Flavour Physics beyond the LHC
• Monte Carlo Event Generators for Future Lepton Colliders
• Next-to-next-to-leading order event generation for $t\bar{t}H$ production with approximate two-loop amplitude
• Higgs boson decay to massive bottom quarks at order ${\alpha }_s^4$ induced by top-quark Yukawa couplings
• Searches for light exotic scalar decays at the e${}^{+}$e${}^{-}$ Higgs factory