Constraining General Two Higgs Doublet Models by the Evolution of Yukawa Couplings

TL;DR

This paper investigates how the evolution of Yukawa couplings in general two Higgs doublet models can be used to impose constraints, particularly focusing on flavor-changing effects and symmetry breaking.

Contribution

It introduces a method to constrain two Higgs doublet models by analyzing the renormalization group evolution of Yukawa couplings and their phenomenological implications.

Findings

Off-diagonal Yukawa couplings can violate experimental FCNC constraints.

Landau pole considerations limit model parameter space.

Z2 symmetry breaking is constrained by flavor physics.

Abstract

We study how general two Higgs doublet models can be constrained by considering their properties under renormalization group evolution of the Yukawa couplings. We take into account both the appearance of a Landau pole as well as off-diagonal Yukawa couplings leading to flavour changing neutral currents in violation with experimental constraints at the electroweak scale. We find that the latter condition can be used to limit the amount of Z2 symmetry breaking allowed in a given model.