Neutrino oscillations and mixings with three flavors

TL;DR

This paper presents a comprehensive three-flavor neutrino oscillation analysis, providing best-fit parameters and excluding certain mass regions, enhancing understanding of neutrino mixing and mass differences.

Contribution

It offers the first global fit to all neutrino oscillation data within a three-flavor framework, excluding regions affected by the MSW effect for solar neutrinos.

Findings

Best-fit mixing angles: θ1 ≈ 28.9°, θ2 ≈ 4.2°, θ3 ≈ 45.0°

Mass-squared differences: Δm21² ≈ 2.87×10⁻⁴ eV², Δm32² ≈ 1.11 eV²

Indicates maximal mixing between the two lightest neutrino states

Abstract

Global fits to all data of candidates for neutrino oscillations are presented in the framework of a three-flavor model. The analysis excludes mass regions where the MSW effect is important for the solar neutrino problem. The best fit gives $\theta_1 \approx 28.9^\circ, \theta_2 \approx 4.2^\circ, \theta_3 \approx 45.0^\circ, m_2^2 - m_1^2 \approx 2.87 \cdot 10^{-4} eV^2$, and $m_3^2 - m_2^2 \approx 1.11 eV^2$ indicating essentially maximal mixing between the two lightest neutrino mass eigenstates.