Type-I 2HDM under the Higgs and Electroweak Precision Measurements

Understand

We explore the extent to which future precision measurements of the Standard Model (SM) observables at the proposed $Z$-factories and Higgs factories may have impacts on new physics beyond the Standard Model, as illustrated by studying the Type-I Two-Higgs-doublet model (Type-I 2HDM).

• We include the contributions from the heavy Higgs bosons at the tree-level and at the one-loop level in a full model-parameter space.
• While only small $\tan\beta$ region is strongly constrained at tree level, the large $\tan\beta$ region gets constrained at loop level due to $\tan\beta$ enhanced tri-Higgs couplings.
• We perform a multiple variable global fit with non-alignment and non-degenerate masses.