Higgs-boson visible and invisible constraints on hidden sectors

We investigate the impact of interactions between hidden sectors and discovered Higgs boson $h_{125}$, allowing for additional invisible decay channels $h_{125}$. perform $\chi^2$-fits to measurements Higgs-boson cross sections as a function branching ratio different combinations coupling modifiers, where latter quantify modifications couplings $h_{125}$ compared predictions Standard Model. present generic results in terms exclusion limits on modifiers Additionally, we apply our variety concrete model realizations containing sector: dark matter within Higgs- singlet-portal scenarios, models featuring (pseudo) Nambu-Goldstone bosons two doublet extensions. One main conclusions work is that wide class indirect constraints resulting from provide substantially stronger direct obtained searches However, demonstrate presence an mode can also open up parameter space regions which otherwise would be excluded result constraints. As byproduct analysis, show light new LZ collaboration fermionic DM candidate simplest Higgs-portal scenario ruled out under standard assumptions.