Deviation from Tri-Bimaximal Mixing and Large Reactor Mixing Angle

TL;DR

This paper explores how breaking a 2-3 flavor symmetry in the neutrino sector can explain the observed non-zero reactor mixing angle, deviating from the tri-bimaximal mixing pattern.

Contribution

It introduces a model that accounts for the sizable $ heta_{13}$ by analyzing deviations from TBM due to neutrino sector symmetry breaking, expanding on previous charged lepton sector work.

Findings

Deviations from TBM are derived due to neutrino sector symmetry breaking.

The model successfully accommodates the observed non-zero $ heta_{13}$.

Both neutrino and charged lepton sectors contribute to mixing angle deviations.

Abstract

Recent observations for a non-zero $\theta_{13}$ have come from various experiments. We study a model of lepton mixing with a 2-3 flavor symmetry to accommodate the sizable $\theta_{13}$ measurement. In this work, we derive deviations from the tri-bimaximal (TBM) pattern arising from breaking the flavor symmetry in the neutrino sector, while the charged leptons contribution has been discussed in a previous work. Contributions from both sectors towards accommodating the non-zero $\theta_{13}$ measurement are presented.