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The trilinear Higgs coupling ₇₇₇ is a crucial tool to probe the structure of the Higgs potential and to search for possible effects of physics beyond the Standard Model (SM). Focusing on the Two-Higgs-Doublet Model as a concrete example, we identify parameter regions in which ₇₇₇ is significantly enhanced with respect to its SM prediction. Taking into account all relevant corrections up to the two-loop level, we show that current experimental bounds on ₇₇₇ already rule out significant parts of the otherwise unconstrained parameter space. We illustrate the interpretation of the current results and future measurement prospects on ₇₇₇ for a benchmark scenario. Recent results from direct searches for BSM scalars in the A ZH channel and their implications will also be discussed in this context.
Braathen et al. (Fri,) studied this question.