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.

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 proceedings volume presents discussions on the technical aspect of the detection of low energy solar neutrinos. Most of the problems related to the experiments aiming to measure low energy solar neutrinos are dealt with.

The aim of this workshop was to put together the efforts from various fields necessary for understanding neutrino oscillations in detail, from both experimental and theoretical points of view. One of the main experimental issues was to understand the absolute flux of both the atmospheric and the solar neutrinos in order to obtain detailed parameter information on neutrino oscillations.The proceedings contain many discussions on phenomenology and theories about neutrino mass and oscillations. The topics include: solar neutrino oscillations; neutrino mixing and the neutrino mass matrices; the origin of the neutrino masses; long baseline neutrino oscillation experiments; KamLAND and low energy neutrino measurements. Related subjects such as μ-eγ experiments and proton decay are also discussed.

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.

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 proceedings volume presents discussions on the technical aspect of the detection of low energy solar neutrinos. Most of the problems related to the experiments aiming to measure low energy solar neutrinos are dealt with.

The aim of this workshop was to put together the efforts from various fields necessary for understanding neutrino oscillations in detail, from both experimental and theoretical points of view. One of the main experimental issues was to understand the absolute flux of both the atmospheric and the solar neutrinos in order to obtain detailed parameter information on neutrino oscillations.The proceedings contain many discussions on phenomenology and theories about neutrino mass and oscillations. The topics include: solar neutrino oscillations; neutrino mixing and the neutrino mass matrices; the origin of the neutrino masses; long baseline neutrino oscillation experiments; KamLAND and low energy neutrino measurements. Related subjects such as μ-eγ experiments and proton decay are also discussed.