$\Delta \left( 27\right)$ flavor singlet-triplet Higgs model for fermion masses and mixings

TL;DR

This paper introduces a $ ext{Delta}(27)$ flavor symmetry-based multiscalar singlet extension of the singlet-triplet Higgs model, explaining fermion mass hierarchies and mixing patterns through spontaneous symmetry breaking and the type-II seesaw mechanism.

Contribution

It presents a novel multiscalar singlet extension with $ ext{Delta}(27)$ symmetry that accounts for fermion masses, mixings, and neutrino masses within a unified framework.

Findings

Successfully reproduces SM fermion mass hierarchies

Derives extended Gatto-Sartori-Tonin relations for quarks

Provides a mechanism for light neutrino masses via type-II seesaw

Abstract

We propose a multiscalar singlet extension of the singlet-triplet Higgs model capable of explaining the SM fermion mass spectrum and mixing parameters. Our model is based on the $\Delta \left( 27\right) $ family symmetry, supplemented by cyclic symmetries, which are spontaneously broken thus yielding the observed hierarchy of the SM charged fermion masses and quark mixing angles. The masses of the light active neutrinos are produced by type-II seesaw mechanism mediated by the neutral component of the $SU(2)_{L}$ scalar triplet. The model symmetries lead to the extended Gatto-Sartori-Tonin relations between the quark masses and mixing angles.