# Could electron-top interactions spoil the measurement of the Higgs trilinear? A quantitative estimate at future lepton colliders

- Institution: CERN
- Speaker: Lucine Tabatt
- Year: 2026
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3020968)
- Licence: [CERN](https://copyright.web.cern)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

The measurement of the Higgs self-coupling is considered the next milestone in the study of the Higgs boson properties. At future $e^+e^-$ facilities below the double Higgs production threshold, this is extracted from the $Zh$ production cross-section, which is sensitive to the trilinear coupling at the one-loop level. At the same perturbative order, potential effects beyond the Standard Model (SM) may affect the Higgstrahlung rate and distort the self-coupling determination. We study the question focusing especially on contact interactions containing two electron and two top-quark fields. We conclude that, in the context of FCC-ee and its planned runs at different energies, $eett$ interactions change the Higgs self-coupling sensitivity below the percent level. Even in the most pessimistic scenarios, we confirm a robust sensitivity of the order of 17% at the 1$\sigma$ confidence level under the assumption of otherwise SM-like Higgs couplings. A crucial role in these results is played by the measurement of fermion pair production above the $Z$ resonance.

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## Lectures

1. [Could electron-top interactions spoil the measurement of the Higgs trilinear? A quantitative estimate at future lepton colliders](https://invisiblenetwork.ai/learn/cern/3020968/71203f82b670), 11 min (CERN's player)