Comment on "Three Extra Mirror or Sequential Families: Case for a Heavy Higgs Boson and Inert Doublet"

TL;DR

This paper argues that the existence of three extra families compatible with the Standard Model can be explained by Majorana neutrinos without needing additional Higgs doublets, challenging previous claims.

Contribution

It demonstrates that Majorana neutrinos alone can account for the compatibility of extra families with the Standard Model, reducing reliance on beyond Standard Model Higgs sectors.

Findings

Majorana neutrinos can explain extra families within the SM

Less dependence on additional Higgs doublets than previously thought

Supports simpler extensions of the Standard Model

Abstract

In a recent Letter Martinez et al.2011 have argued that the existence of extra three families is still perfectly in accord with the standard model (SM), as long as an additional Higgs doublet is also present. Here we claim that the mentioned accordance can be obtained with less reliance on BSM physics like additional Higgs doublets, but benefiting from Majorana neutrinos is sufficient.