Seminarium "Teoria cząstek elementarnych i kosmologia"

The interactions of the discovered Higgs boson have been scrutinized in the LHC experiments. The current measurement results show that the properties of the discovered Higgs boson are consistent with the SM. This fact constrains wide parameter space in extended Higgs models. However, many models can fit with the current results by considering the near alignment scenario where the predictions of the Higgs boson couplings are SM-like. The intriguing thing in the near-alignment scenario is that behaviors of the heavy Higgs boson decays can be drastically changed, depending on the size of deviations in the Higgs boson couplings. This indicates that NLO corrections to the heavy Higgs boson decays can be significant in the near alignment scenario. In particular, this is the case for the decay processes that vanish in the alignment limit (e.g., A-->Zh, H-->hh). In this talk, taking two Higgs doublet models (2HDMs) as concrete examples, we show the impact of NLO corrections on the heavy Higgs boson decays. We also demonstrate that types of 2HDMs can be discriminated by the decay pattern of the CP-odd Higgs boson.