The three- and four-Higgs couplings in the general two-Higgs-doublet model

Understand

We apply the unitarity bounds and the bounded-from-below (BFB) bounds to the most general scalar potential of the two-Higgs-doublet model (2HDM).

• We do this in the Higgs basis, i.e.
• in the basis for the scalar doublets where only one doublet has vacuum expectation value.
• In this way we obtain bounds on the scalar masses and couplings that are valid for all 2HDMs.