Sensitivity to new physics: single-Higgs couplings vs. the trilinear Higgs coupling
Abstract
The trilinear Higgs self-coupling provides a unique probe of the structure of the Higgs potential and of the nature of the electroweak phase transition, and constitutes a key target for future collider experiments. Recent studies have shown that confronting theoretical predictions for the trilinear Higgs coupling with current experimental bounds offers a powerful and complementary way to test effects of physics beyond the Standard Model (BSM), in particular those arising from extended Higgs sectors. Meanwhile, substantial progress has been achieved in the precise calculation and automation of the trilinear Higgs coupling in a wide class of BSM models. This contribution discusses several BSM scenarios, compatible with existing constraints, in which sizeable deviations in the trilinear Higgs coupling w.r.t. the Standard Model (SM) value are predicted, while other Higgs observables remain close to their SM expectations and are therefore difficult to probe experimentally. These results highlight the strong physics motivation for a precise measurement of the trilinear Higgs coupling at a future Higgs factory.
Cite
@article{arxiv.2603.26633,
title = {Sensitivity to new physics: single-Higgs couplings vs. the trilinear Higgs coupling},
author = {Henning Bahl and Johannes Braathen and Martin Gabelmann and Sven Heinemeyer and Kateryna Radchenko Serdula and Alain Verduras Schaeidt and Georg Weiglein},
journal= {arXiv preprint arXiv:2603.26633},
year = {2026}
}
Comments
11 pages, 5 figures, Contribution to the International Workshop on Future Linear Colliders (LCWS 2025), 20-24 October 2025. Valencia, Spain (C25-10-20.1)