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

We build the first 3-3-1 model based on the $\mathrm{\Delta }(27)$ 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.