ILC Workshop on Potential Experiments (ILCX2021)

H to hh decay in extended Higgs sectors with a nearly alignment scenario

28 Oct 2021, 10:20

20m

Room #2 (Zoom Meeting ID: 823 6921 2312)

Oral presentation using Zoom Session F: Higgs properties F-1: Higgs properties

Speaker

Kei Yagyu (Osaka U)

Description

Searches for extra Higgs bosons are quite important for a direct test of models with extended Higgs sectors. On the other hand, recent LHC data indicates that properties of the discovered Higgs boson are consistent with the SM Higgs boson within the error.
This favors a nearly alignment scenario in models with extended Higgs sectors, where the discovered Higgs boson couplings are almost the same as those of the SM Higgs boson at tree level.
We show that in such an alignment scenario the decay branching ratio of a heavy Higgs boson into the SM-like Higgs bosons can significantly be modified at one-loop level
as compared with the tree level prediction. In particular, we discuss two Higgs doublet models as an important example.

Presentation materials

2021-10-ILCX_Hhh_Yagyu.pdf