Speaker
Description
Although the Higgs boson has been discovered, its couplings to Standard Model (SM) particles may deviate from SM predictions. Such deviations can arise in extensions of the SM, including those that modify the Higgs sector. In particular, extended Higgs models often exhibit different shapes of the Higgs potential depending on their structure. In this work, we focus on near-aligned extended Higgs models, which can be well described as a classical field. The shape of the Higgs potential in these models can be characterized by the trilinear Higgs boson coupling, providing a powerful classification tool. Precise measurements of this coupling at future collider experiments could serve as an efficient way to discriminate between different extended Higgs scenarios. In this talk, we calculate the trilinear Higgs coupling, including one-loop corrections from top quarks and new particles, for several representative nearly-aligned Higgs models. We also discuss the potential to constrain model-dependent parameters based on expected sensitivities at future colliders. This work is a work in progress.
