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English Intern
  • Seminar Elementarteilchenphysik
Theoretische Physik II

MSc. Duarte Fontes

University of Lisbon

O n l i n e   T a l k : 17-Dec-2020

Renormalization of the complex 2HDM with FeynMaster 2

Abstract

I present the one-loop electroweak renormalization of the CP violating Two-Higgs-Doublet Model with softly broken Z2 symmetry (C2HDM). The existence of CP violation in the scalar sector of the model leads to a quite unique process of renormalization, as it requires the introduction of several non-physical parameters. The C2HDM will thus have more independent counterterms than independent renormalized parameters, which means that different combinations of counterterms can be taken as independent for the same set of independent renormalized parameters. I compare the behaviour of selected combinations in specific NLO processes, which are assured to be gauge independent via a simple prescription. In all this, and by deriving Feynman rules, counterterms and one-loop processes in a simultaneously automatic and flexible way, FeynMaster 2 is presented as an ideal tool to renormalize a model such as the C2HDM and investigate it at NLO.