Large \theta_13 from finite quantum corrections in quasi-degenerate neutrino mass spectrum

TL;DR

This paper investigates quantum corrections to neutrino mixing matrices, highlighting challenges in explaining the large b_13 angle, and proposes a new mixing pattern with a simple model extension.

Contribution

It introduces a novel neutrino mixing pattern that better fits experimental data, addressing limitations of previous models.

Findings

Quantum corrections struggle to produce large b_13 angles.

A new neutrino mixing pattern successfully fits experimental observations.

A simple extension of the standard model can realize the proposed pattern.

Abstract

We study finite quantum corrections for several well known neutrino mixing matrices and find that it is hard to account for the large value of \theta_13 recently reported by T2K and MINOS. To nicely reproduce all experimentally favored neutrino mixing angles and masses, we propose a new neutrino mixing pattern. We also demonstrate a simple realization by slightly extending the standard model to illustrate the quantum corrections.