Sommaire:

A dark sector of particles interacting with the Higgs boson might reveal the origin of dark matter or facilitate electroweak baryogenesis. At particle colliders, the direct search for such Higgs-portal interactions is difficult if the dark particles lie above the Higgs threshold. In scenarios with electroweakly interacting mediators, two alternative signatures can facilitate the search: resonant production of mediators decaying into dark particles, and indirect effects of virtual mediators in visible Higgs decays. I will discuss the complementarity of these two approaches and present new results on virtual effects of dark fermions in Higgs decays to electroweak gauge boson pairs.

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