Renormalization schemes for the Two-Higgs-Doublet Model and applications to h -> WW/ZZ -> 4fermions

Understand

We perform the renormalization of different types of Two-Higgs-Doublet Models for the calculation of observables at next-to-leading order.

• In detail, we suggest four different renormalization schemes based on on-shell renormalization conditions as far as possible and on MSbar prescriptions for the remaining field-mixing parameters where no distinguished on-shell condition exists and make contact to existing schemes in the literature.
• In particular, we treat the tadpole diagrams in different ways and discuss issues of gauge independence and perturbative stability in the considered schemes.
• The renormalization group equations for the MSbar parameters are solved in each scheme, so that a consistent renormalization scale variation can be performed.