Large Higgs-electron Yukawa coupling in 2HDM

Understand

The present upper bound on $\kappa_e$, the ratio between the electron Yukawa coupling and its Standard Model value, is of ${\cal O}(600)$.

• We ask what would be the implications in case that $\kappa_e$ is close to this upper bound.
• The simplest extension that allows for such enhancement is that of two Higgs doublet models (2HDM) without natural flavor conservation.
• In this framework, we find the following consequences: (i) Under certain conditions, measuring $\kappa_e$ and $\kappa_V$ would be enough to predict values of Yukawa couplings for other fermions and for the $H$ and $A$ scalars.