Seesaw-I and II Hybrid $T^{\prime}$ Symmetric Neutrino Masses with Mass Selection Rule

TL;DR

This paper proposes a new neutrino mixing scheme based on a $T^{\prime}$ flavor symmetry with a specific mass selection rule, combining type-I and II seesaw mechanisms to predict neutrino masses and mixing parameters.

Contribution

It introduces a novel neutrino mass texture with a selection rule within a $T^{\prime}$ symmetry framework, extending the Standard Model with a minimal combined seesaw approach.

Findings

Predictions for neutrino mass orderings and mixing angles.

Specific values for lightest neutrino mass and neutrinoless double beta decay.

Constraints on CP-violating phases in neutrino mixing.

Abstract

The present manuscript studies a recently proposed new neutrino mixing scheme with a neutrino mass selection rule, $m_{\nu}^{13} + m_{\nu}^{22} + m_{\nu}^{31} = 0$, among a neutrino mass matrix elements. The neutrino mass matrix texture is achieved by means of $T^{\prime}$ flavor discrete symmetry extension of the Standard Model gauge group. The model realizing the neutrino mixing pattern consists of a combination of type-I and II seesaw mechanisms in the minimal possible extension of the Standard Model. Stringent predictions are obtained for normal and inverted neutrino mass orderings. Some important predictions include $\alpha_2 \approx 2\pi$ (best fit), $m_{\text{lightest}} \approx 3 - 4 \times 10^{-4}\,\text{eV}$, and $m_{ee}^{0\nu\beta\beta} \approx 3 \times 10^{-3}\,\text{eV}$ for normal neutrino mass ordering; $110^\circ < \alpha_1 < 170^\circ$, $40(220)^\circ < \alpha_2 < 60(240)^\circ$, $240^\circ < \delta_{\text{Dirac}} < 310^\circ$, and $m_{\text{lightest}} \approx 2 \times 10^{-5} - 7 \times 10^{-3}\,\text{eV}$ for inverted neutrino mass ordering.