A 3-3-1 model with SU(8) unification

TL;DR

This paper develops a unified SU(8) model embedding a 3-3-1 framework for three fermion families, deriving fermion mass hierarchies and mixing patterns through a novel symmetry-breaking and mass matrix structure.

Contribution

It introduces a comprehensive SU(8) unification scheme for 3-3-1 models, detailing fermion content, symmetry breaking, and mass generation mechanisms with hierarchical features.

Findings

Light fermion masses are generated at different loop levels.

Mass ratios for up-type quarks are consistent with observed hierarchies.

The model predicts specific flavor structure without hierarchical Yukawa couplings.

Abstract

We construct a 3-3-1 model for three families that can be embedded into a single SU(8) unified model. Assuming appropriate branching rules and symmetry-breaking pattern, we find a complete fermion content within irreducible representations of SU(8), where light standard model fermions, heavy 3-3-1 fermions and super-heavy fermions may be distinguished. In the framework of the doubly lopsided mechanism, we obtain mass matrix structures which exhibit nontrivial flavor hierarchical features. Among the up-type quarks, one (top quark) has tree-level mass and two (charm and up) get masses at one-loop level. Considering only dominant contributions, we may obtain the ratios $|m_c/m_t| \approx 7.4 \times 10^{-3}$ and $|m_u/m_c| \approx 1.9 \times 10^{-3}$ with few assumptions on the free parameters and without any hierarchical requirements on the Yukawa couplings.