Neutrino Oscillations: A Global Analysis

Abstract

We review the status of the neutrino oscillation physics (as of June 2003), with a particular emphasis on the present knowledge of the neutrino mass-mixing parameters in a three generation approach. We consider first the nu_mu-->nu_tau flavor transitions of atmospheric neutrinos. It is found that standard oscillations provide the best description of the SK+K2K data, and that the associated mass-mixing parameters are determined at 1 sigma (and dof=1) as: Delta m^2=(2.6 +-0.4) x 10^-3 eV^2 and sin^2(2theta)=1.00+0.00-0.05. Such indications, presently dominated by SK, could be strengthened by further K2K data. Then we analyze the energy spectrum of reactor neutrino events recently observed at KamLAND and combine them with solar and terrestrial neutrino data. We find that the solution to the solar neutrino problem at large mixing angle (LMA) is basically split into two sub-regions, that we denote as LMA-I and LMA-II. The LMA-I solution, characterized by lower values of the squared neutrino mass gap, is favored by the global data fit. Finally, we briefly illustrate how prospective data from the SNO and KamLAND can increase our confidence in the occurrence of standard matter effects in the Sun, which are starting to emerge from current data.

Invited talk given by G.L. Fogli at the XXIII Physics in Collisions Conference (PIC03), Zeuthen, Germany, June 2003. 2nd version significantly shortened to match editorial constraints; 16 pages, including 7 figures

References in corpus (19)

• Limits on Neutrino Oscillations from the CHOOZ Experiment
• Solar Models: current epoch and time dependences, neutrinos, and helioseismological properties
• Standard Neutrino Spectrum from B-8 Decay
• The Dark Side of the Solar Neutrino Parameter Space
• Imprint of SNO neutral current data on the solar neutrino problem
• Implications of the first neutral current data from SNO for Solar Neutrino Oscillation
• Matter-enhanced Three-flavor Oscillations and the Solar Neutrino Problem
• Testing violations of special and general relativity through the energy dependence of nu_mu<--->nu_tau oscillations in the Super-Kamiokande atmospheric neutrino experiment
• Shape of the 8B Alpha and Neutrino Spectra
• Accelerator and Reactor Neutrino Oscillation Experiments in a Simple Three-Generation Framework
• Super-Kamiokande data and atmospheric neutrino decay
• Global Analysis with SNO: Toward the Solution of the Solar Neutrino Problem
• Matter Effects in Four-Neutrino Mixing
• Quasivacuum solar neutrino oscillations
• Analytical description of quasivacuum oscillations of solar neutrinos
• MSW Effects in Vacuum Oscillations
• On the Evolution of the Neutrino State inside the Sun
• Constraints on $|U_{e3}{|}^2$ from a Three-Neutrino Oscillation Analysis of the CHOOZ Data
• Three Generation Neutrino Oscillation Parameters after SNO

Cited by in corpus (8)

• Gravitational clustering of relic neutrinos and implications for their detection
• Models of Baryogenesis via Spontaneous Lorentz Violation
• Do neutrino flavor oscillations forbid large lepton asymmetry of the universe ?
• Neutrino Mass Models
• Determining the heavy seesaw neutrino mass matrix from low-energy parameters
• Neutrino oscillations in a neutrino-dominated accretion disk around a Kerr BH
• Leptogenesis implications in models with Abelian family symmetry and one extra real Higgs singlet
• Relic neutrino clustering and implications for their detection