2HDM without FCNC: off the beaten tracks

TL;DR

This paper introduces a novel approach to constructing two Higgs-doublet models that avoid scalar-mediated FCNC at tree level, featuring flavor-diagonal but nonuniversal Yukawa couplings, and demonstrates their potential to replicate quark flavor structures.

Contribution

It presents an alternative method for building 2HDMs without FCNC at tree level, with semi-realistic Yukawa textures and distinctive flavor features.

Findings

Models reproduce quark flavor structure

Flavor-diagonal nonuniversal Yukawa couplings identified

Method offers new pathways for 2HDM construction

Abstract

We propose an alternative method of constructing two Higgs-doublet models free from scalar mediated FCNC couplings at the tree-level. In a toy scenario, we have presented semi realistic textures for the Yukawa matrices, which can reproduce the approximate flavor structure in the quark sector. Presence of flavor diagonal but nonuniversal Yukawa couplings emerges as a distinguishing feature of such models.