The $\Delta(27)$ flavor 3-3-1 model with neutral leptons

TL;DR

This paper introduces a novel 3-3-1 model based on the $$Delta(27)$$ symmetry, explaining fermion masses, mixings, and neutrino properties, including CP violation and neutrinoless double beta decay predictions.

Contribution

It presents the first 3-3-1 model with $$Delta(27)$$ symmetry that successfully accounts for fermion masses, mixings, and neutrino phenomena, incorporating combined seesaw mechanisms.

Findings

Predicts a leptonic Dirac CP phase of $-rac{}{2}$.

Estimates neutrinoless double beta decay effective mass: 10 meV (normal hierarchy) and 18 meV (inverted hierarchy).

Consistent with experimental leptonic mixing angles.

Abstract

We build the first 3-3-1 model based on the $\Delta (27)$ discrete group symmetry, consistent with fermion masses and mixings. In the model under consideration, the neutrino masses are generated from a combination of type-I and type-II seesaw mechanisms mediated by three heavy right-handed Majorana neutrinos and three $SU(3)_{L}$ scalar antisextets, respectively. Furthermore, from the consistency of the leptonic mixing angles with their experimental values, we obtain a non-vanishing leptonic Dirac CP violating phase of $-\frac{\pi }{2}$. Our model features an effective Majorana neutrino mass parameter of neutrinoless double beta decay, with values $m_{\beta \beta }=$ 10 and 18 meV for the normal and the inverted neutrino mass hierarchies, respectively.