Extended Higgs boson sectors, effective field theory, and Higgs boson phenomenology

We consider the phenomenological implications of charged scalar extensions Standard Model (SM) Higgs sector in addition to effective field theory (EFT) couplings this new state SM matter. perform a detailed investigation modifications loop-induced decays 125 GeV boson, which receives corrections from propagating scalars alongside one-loop EFT operator insertions and demonstrate that interplay $H\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ $H\ensuremath{\rightarrow}Z\ensuremath{\gamma}$ can be used clarify additional states phenomenology case discovery is made future. In parallel, interactions lead decreased sensitivity virtual presence states, significantly weaken constraints are naively expected precisely measured branching ratio. Again measurements provide complementary exploited