Large Mixing and CP Violation in Neutrino Oscillations

TL;DR

This paper proposes a simple phenomenological model explaining lepton flavor mixing and CP violation, naturally producing a nearly bi-maximal mixing pattern consistent with neutrino oscillation data, and predicts measurable CP violation effects.

Contribution

It introduces a novel phenomenological model based on flavor democracy and neutrino mass degeneracy that naturally explains observed neutrino mixing patterns and predicts CP violation measurable in experiments.

Findings

Nearly bi-maximal mixing pattern explains atmospheric and solar neutrino data.

CP violation strength is about one percent, potentially measurable in experiments.

Discussion of similarities and differences between lepton and quark mixing phenomena.

Abstract

I introduce a simple phenomenological model of lepton flavor mixing and CP violation based on the flavor democracy of charged leptons and the mass degeneracy of neutrinos. The nearly bi-maximal mixing pattern, which can interpret current data on atmospheric and solar neutrino oscillations, emerges naturally from this model. The rephasing-invariant strength of CP or T violation amounts to about one percent and could be measured in the long-baseline neutrino experiments. The similarity and difference between lepton and quark flavor mixing phenomena are also discussed.