Contents:

• Solar Neutrinos:
  • The Latest Solar Neutrino Results in Super-Kamiokande (Y Koshio)
  • Weak Current in Deuterium (T Sato)
• Solar Neutrino Phenomenology and Future:
  • Solar Neutrino Oscillations (M C Gonzalez-Garcia)
  • The Status of Resonant Spin Flavor Precession (C S Lim)
• Atmospheric Neutrinos:
  • Status of the Atmospheric Neutrino Studies (M D Messier)
  • Cosmic Ray Measurements for Atmospheric Neutrino with BESS-TeV (K Abe)
• Oscillation Phenomenology I:
  • Calculations of the Atmospheric ν Fluxes (P Lipari)
  • Three-Flavor Analysis of Atmospheric and Solar Neutrinos (A Marrone)
• Absolute Neutrino Mass:
  • Neutrinoless Double Beta Decay and Neutrino Oscillations (H V Klapdor-Kleingrothaus)
• Accelerator Neutrinos, CPV:
  • The MINOS Experiment (M D Messier)
  • The JHF-Kamioka Neutrino Project (T Kajita)
• Models and GUTs:
  • Proton Decay in the Semi-Simple Unification Model (T Watari)
  • Leptogenesis via LHu Flat Direction (M Fujii)
• Lepton Flavor Violation:
  • Probing Physics Beyond the Standard Model from Lepton Sector (J Hisano)
• Oscillation Phenomenology II:
  • Four Puzzles of Neutrino Mixing (S M Barr)
• Supernova Neutrinos:
  • Supernova Neutrinos (J F Beacom)
• and other papers

Readership: Researchers in high energy physics.

The discovery of neutrino oscillations in 1998 initiated efforts to form a group to work on the detailed study of the phenomenon; this study is now supported by a grant-in-aid in the specific field of neutrinos from the Japanese Ministry of Education, Culture and Sports. The aim of this working group is to put together the efforts from various fields necessary for understanding neutrino oscillations in detail from both the experimental and the theoretical point of view. The 4th International Workshop on Neutrino Oscillations and Their Origin was held to discuss recent progress in both experimental and theoretical study.

This volume brings together international experts in diverse areas of physics to discuss recent progress in the experimental and theoretical study of neutrino oscillations.Readers are brought up to date with the latest developments in important neutrino experiments, and the associated progress in theory is summarized. The principal projects worldwide, such as Super-Kamiokande, SNO, KamLAND, are considered, and contributions also report on future experiments, including JPARC, OPERA, and MINOS.Several other related topics, such as dark matter, double beta decay, lepton flavor violation, and cosmology, are discussed, reflecting the wide-ranging specializations of many contributors outside of pure neutrino physics.