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arXiv · 2202.03453

New constraints on extended Higgs sectors from the trilinear Higgs coupling

Henning Bahl·Johannes Braathen·Georg Weiglein
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Abstract

The trilinear Higgs coupling $λ_{hhh}$ is crucial for determining the structure of the Higgs potential and for probing possible effects of physics beyond the Standard Model (SM). Focusing on the Two-Higgs-Doublet Model as a concrete example, we identify parameter regions in which $λ_{hhh}$ is significantly enhanced with respect to the SM. Taking into account all relevant corrections up to the two-loop level, we show that already current experimental bounds on $λ_{hhh}$ rule out significant parts of the parameter space that would otherwise be unconstrained. We illustrate the interpretation of the results on $λ_{hhh}$ for a benchmark scenario. Similar results are expected for wide classes of models with extended Higgs sectors.

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Henning Bahl, Johannes Braathen, Georg Weiglein. 2022-12-08. New constraints on extended Higgs sectors from the trilinear Higgs coupling. https://doi.org/10.1103/physrevlett.129.231802

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