Re-evaluation of neutrino mixing pattern according to latest T2K result

TL;DR

This paper re-evaluates neutrino mixing patterns in light of the latest T2K results, showing larger deviations from previous models and proposing a new pattern with a self-complementary relation that fits data well.

Contribution

It introduces updated triminimal expansions based on BM and TB patterns and proposes a novel mixing pattern with a self-complementary angle relation.

Findings

Larger deviations from BM and TB mixing patterns.

Several schemes connecting PMNS and CKM matrices fit the new data.

A new mixing pattern with a self-complementary angle relation describes the data well.

Abstract

We re-evaluate neutrino mixing patterns according to the latest T2K result for a larger mixing angle $\theta_{13}$, and find that the PMNS mixing matrix has larger deviations from bimaximal (BM) and tribimaximal (TB) mixing patterns than previously expected. We also find that several schemes connecting PMNS and CKM mixing matrices can accommodate the latest T2K result nicely. As necessary updates to former works, we make new triminimal expansions of PMNS mixing matrix based on BM and TB mixing patterns. We also propose a new mixing pattern with a self-complementary relation between the mixing angles $\theta_{12}^{\nu} + \theta_{13}^{\nu} \simeq 45^\circ$, and find such a new mixing pattern in leading order can provide a rather good description of the data.