Phenomenological Study of Type II Seesaw with $\Delta(27)$ Symmetry

TL;DR

This paper explores a type-II seesaw model extended with $ ext{Delta}(27)$ symmetry, addressing neutrino masses, mixings, matter-antimatter asymmetry, and lepton flavor violation through detailed numerical analysis and phenomenological implications.

Contribution

It introduces a novel $ ext{Delta}(27)$ flavor symmetry extension to the type-II seesaw mechanism, providing comprehensive phenomenological analysis and predictions.

Findings

Neutrino oscillation parameters consistent with experimental data

Leptogenesis explains matter-antimatter asymmetry at TeV scale

Predictions for lepton flavor violating decay rates

Abstract

We discuss the phenomenology of type-II seesaw by extending the Standard Model with additional Higgs doublets and scalar triplets additionally invoked with $\Delta(27)$ flavor symmetry for the explanation of non-zero neutrino masses and mixings, matter-antimatter asymmetry and lepton flavor violation. The non-zero neutrino masses can be realized via type-II seesaw mechanism by introducing scalar triplets transforming as triplets under $\Delta(27)$ while we add additional $SU(2)_L$ scalar doublets to have correct charge lepton masses. We further demonstrate with detailed numerical analysis in agreement with neutrino oscillation data like non-zero reactor mixing angle, $\delta_{CP}$, the sum of the light neutrino masses, two mass squared differences and its implication to neutrinoless double beta decay. We also discuss on the matter-antimatter asymmetry of the universe through leptogenesis with the decay of TeV scale scalar triplets and variation of CP-asymmetry with input model parameters. Finally, we comment on implication to lepton flavor violating decays like $\mu \to e \gamma$, $\mu \to 3 e$ processes.