Vacuum Stability of Asymptotically Safe Two Higgs Doublet Models

Understand

We study different types of Two Higgs Doublet Models (2HDMs) under the assumption that all quartic couplings' beta functions vanish simultaneously at the Planck scale.

• The Standard Model seems to display this property almost accidentally, because the Higgs boson mass is close to 125 GeV.
• This also ties closely into the question of whether the theory is stable or metastable.
• We investigate if such "fixed points" can exist in various $\mathbb{Z}_2$-symmetric 2HDM subclasses, and if the theories that meet these conditions are phenomenologically viable, as well as vacuum stable.