Bi-large neutrino mixing and the Cabibbo angle

TL;DR

The paper proposes a new neutrino mixing matrix parametrization where the reactor angle, approximately equal to the Cabibbo angle, seeds large solar and atmospheric mixing angles, challenging the tri-bimaximal mixing paradigm.

Contribution

It introduces a bi-large mixing pattern model with the reactor angle set to the Cabibbo angle, providing a new standard for neutrino mixing models.

Findings

Reactor angle approximately equals the Cabibbo angle.

Large solar and atmospheric mixing angles are seeded by the reactor angle.

Challenges the tri-bimaximal mixing ansatz.

Abstract

Recent measurements of the neutrino mixing angles cast doubt on the validity of the so-far popular tri-bimaximal mixing ansatz. We propose a parametrization for the neutrino mixing matrix where the reactor angle seeds the large solar and atmospheric mixing angles, equal to each other in first approximation. We suggest such bi-large mixing pattern as a model building standard, realized when the leading order value of the reactor angle equals the Cabibbo angle.