One-loop corrections to the Higgs self-couplings in the singlet extension

Understand

We investigate predictions on the triple Higgs boson couplings with radiative corrections in the model with an additional real singlet scalar field.

• In this model, the second physical scalar state ($H$) appears in addition to the Higgs boson ($h$) with the mass 125 GeV.
• The $hhh$ vertex is calculated at the one-loop level, and its possible deviation from the predictions in the standard model is evaluated under various theoretical constraints.
• The decay rate of $H \to hh$ is also computed at the one-loop level.