Two-Higgs Leptonic Minimal Flavour Violation

TL;DR

This paper develops two-Higgs doublet models with minimal flavor violation that incorporate leptonic sectors, linking flavor-changing neutral currents to fermion mixing matrices, and explores both Dirac and Majorana neutrino cases.

Contribution

It extends minimal flavor violation models to include leptonic sectors with a minimal discrete symmetry, considering both Dirac and Majorana neutrinos.

Findings

Models fix flavor-changing neutral currents using CKM and PMNS matrices.

Identifies minimal discrete symmetry for natural implementation.

Considers both Dirac and Majorana neutrino scenarios.

Abstract

We construct extensions of the Standard Model with two Higgs doublets, where there are flavour changing neutral currents both in the quark and leptonic sectors, with their strength fixed by the fermion mixing matrices $V_{CKM}$ and $V_{PMNS}$. These models are an extension to the leptonic sector of the class of models previously considered by Branco, Grimus and Lavoura, for the quark sector. We consider both the cases of Dirac and Majorana neutrinos and identify the minimal discrete symmetry required in order to implement the models in a natural way.