Neutrino Masses and Bimaximal Mixing

TL;DR

This paper explores neutrino masses and mixing, proposing that deviations from bimaximal mixing are mainly due to a rotation in the electron-muon generation space, with implications for various neutrino experiments.

Contribution

It introduces a model where deviations from bimaximal mixing are explained by a specific rotation, supported by simple seesaw models and Fritzsch's relation, with testable predictions.

Findings

Deviations from bimaximal mixing can be attributed to a rotation in the electron-muon plane.

Predictions for long baseline and solar neutrino oscillations are provided.

Rates of neutrinoless double beta decay are estimated.

Abstract

Solar and atmospheric neutrino anomalies are described by bimaximal mixing of three neutrinos. Neutrino oscillations in appearance nu_e <--> nu_mu,nu_tau and in disappearance nu_e long baseline and atmospheric experiments are sensitive to deviations from the ideal bimaximal mixing. It is suggested that these deviations may be dominated by a rotation in the electron--muon plane of the generation space. Simple seesaw models are described supporting this idea. The rotation angle is estimated from Fritzsch's relation. Predictions are presented for oscillations in long baseline experiments, for solar neutrinos, and for the rates of neutrinoless double beta decays.