Predicting lepton mixing parameters including Majorana phases from Δ(6n²) flavour symmetry and generalised CP

An important class of flavour groups that are subgroups of U(3) and that predict experimentally viable lepton mixing parameters including Majorana phases is the Δ(6n²) series. The most well-known member is Δ(24)=S₄. I present results of several extensive studies of lepton mixing predictions obtained in models with a Δ(6n²) flavour group that preserve either the full Klein symmetry or a Z₂ subgroup for neutrinos and can include a generalised CP symmetry. Predictions include mixing angles and Dirac CP phase generally; and if invariance under a generalised CP symmetry is included, also Majorana phases. For this, the interplay of flavour group and generalised CP symmetry has to be studied carefully. Furthermore, I present results for neutrinoless double-beta decay.