$SU(3)_C\times SU(3)_L\times U(1)_X$ model from $SU(6)$

TL;DR

This paper constructs an $SU(3)_C imes SU(3)_L imes U(1)_X$ model from $SU(6)$, detailing symmetry breaking, neutrino mass generation, and gauge coupling unification, with implications for dark matter.

Contribution

It introduces a novel $SU(6)$-derived $SU(3)_C imes SU(3)_L imes U(1)_X$ model with detailed symmetry breaking, neutrino masses, and unification mechanisms.

Findings

Higgs VEV around 10 TeV for symmetry breaking

Neutrino masses follow a normal hierarchy with a massless lightest neutrino

Gauge coupling unification achieved within 1% with extra particles

Abstract

We propose the $SU(3)_C\times SU(3)_L\times U(1)_X$ model arising from $SU(6)$ breaking. One family of the Standard Model (SM) fermions arises from two $\bar{6}$ representations and one $15$ representation of $SU(6)$ gauge symmetry. To break the $SU(3)_C\times SU(3)_L\times U(1)_X$ gauge symmetry down to the SM, we introduce three $SU(3)_L$ triplet Higgs fields, where two of them come from the $\bar{6}$ representation while the other one from the $15$ representation. We study the gauge boson masses and Higgs boson mass in detail, and find that the vacuum expectation value (VEV) of the Higgs field for $SU(3)_L\times U(1)_X$ gauge symmetry breaking is around 10 TeV. The neutrino masses and mixing can be generated via the littlest inverse seesaw mechanism. In particular, we have normal hierarchy for neutrino masses and the lightest active neutrino is massless. Also, we consider constraints from the charged lepton flavor changing decays as well. Furthermore, introducing two $SU(3)_L$ adjoint fermions, one $SU(3)_C$ adjoint scalar, and one $SU(3)_L$ triplet scalar, we can achieve gauge coupling unification within 1\%. These extra particles can provide a dark matter candidate as well.