Extra doublets - Global analyses of Standard Model extensions in the fermionic or scalar sector

Understand

I present comprehensive analyses of the viable parameter regions of the Standard Model of particle physics and two of its extensions: the Standard Model with four fermion generations and the Two-Higgs-Doublets model of type II.

• Applying frequentist methods, I have performed global fits which show that the Standard Model is compatible with electroweak precision data and the measured Higgs signal strengths.
• The Standard Model with four generations is excluded by the experimental results with a p-value corresponding to more than five standard deviations.
• In the Two-Higgs-Doublets model of type II, the fit prefers the decoupling limit where it mimics the Standard Model; however, neutral heavy Higgs boson masses below 200 GeV are still allowed.