Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 67: Higgs Physics VII (HH and Trilinear Coupling)

T 67.9: Vortrag

Donnerstag, 3. April 2025, 18:15–18:30, ZHG104

Comparison between off-shell and on-shell sensitivity to trilinear Higgs couplings at future colliders based on EFTs and models with an extended Higgs sector — Henning Bahl¹, Philip Bechtle², Johannes Braathen³, Klaus Desch², Christian Grefe², Sven Heinemeyer⁴, Jenny List³, •Murillo Vellasco², and Georg Weiglein^3,5 — ¹Institute for Theoretical Physics (ITP), Universität Heidelberg, Germany — ²Physikalisches Institut, Universität Bonn, Germany — ³Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — ⁴Instituto de Física Teórica (UAM/CSIC), Universidad Autónoma de Madrid, Spain — ⁵Institut für Theoretische Physik, Universität Hamburg, Germany

Measuring the Higgs potential is one of the main goals of the next generation of high-energy particle colliders. Studies of the future sensitivity to trilinear Higgs coupling, λ_hhh, have been mainly performed within the framework of EFTs, which offer some degree of model-independence. However, not only is the EFT approach not valid if BSM degrees of freedom are not fully decoupled, but one must often make a selection of relevant operators to consider out of larger set thereof.

In this work, we have investigated the sensitivity to λ_hhh at future colliders based on UV-complete models with extended Higgs sectors, while also comparing with results from EFT analyses. In particular, we considered cases where on-shell measurements sensitive to λ_hhh would show considerable deviations from the SM value, all the while avoiding large deviations in off-shell observables. The results highlight the need to go beyond EFT frameworks.

Keywords: future colliders; Higgs; self-coupling; SMEFT; BSM