TL;DR
This paper investigates the constraints on the two-Higgs-doublet model, focusing on flavor physics bounds on the charged Higgs boson, and compares these with restrictions in models with a $Z_2$ symmetry.
Contribution
It provides a comprehensive analysis of flavor physics constraints on the general CP-conserving two-Higgs-doublet model with flavor-diagonal Yukawa couplings, including relations to specific $Z_2$ symmetric models.
Findings
Flavor physics constrains the charged Higgs mass and couplings.
Relations between general and $Z_2$ symmetric models are clarified.
Bounds vary depending on Yukawa coupling structures.
Abstract
The two-Higgs-doublet model provides a simple, yet interesting, generalization of the SM Higgs sector. We study the CP-conserving version of this model with general, flavor-diagonal, Yukawa couplings. Indirect constraints are obtained from flavor physics on the charged Higgs boson mass and couplings. The relation of these bounds to those for the more specialized two-Higgs-doublet model types with a symmetry is discussed.
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