A Golden A_5 Model of Leptons with a Minimal NLO Correction

TL;DR

This paper introduces a new A_5 lepton model that minimally corrects leading-order predictions, aligning with recent experimental data and maintaining testable neutrino mass sum rules.

Contribution

It presents a minimal NLO correction to an A_5 lepton model that breaks Klein symmetry and aligns predictions with current experimental measurements.

Findings

Corrects LO predictions to match recent reactor angle measurements

Maintains inverse neutrino mass sum rule

Predicts quasi-degenerate neutrino mass spectrum

Abstract

We propose a new A_5 model of leptons which corrects the LO predictions of Golden Ratio mixing via a minimal NLO Majorana mass correction which completely breaks the original Klein symmetry of the neutrino mass matrix. The minimal nature of the NLO correction leads to a restricted and correlated range of the mixing angles allowing agreement within the one sigma range of recent global fits following the reactor angle measurement by Daya Bay and RENO. The minimal NLO correction also preserves the LO inverse neutrino mass sum rule leading to a neutrino mass spectrum that extends into the quasi-degenerate region allowing the model to be accessible to the current and future neutrinoless double beta decay experiments.