We present the results of an analysis of the data of reactor and accelerator neutrino oscillation experiments in the framework of a model with mixing of three massive neutrino fields and a neutrino mass hierarchy. The results of the LSND experiment are commented. Taking into account future long-baseline neutrino oscillation experiments, we have also analyzed the atmospheric neutrino data in the...

We study the effects of neutrino oscillation on supernova neutrino in the case of the inverted mass hierarchy (m3 ≪ m1 < m2) as well as the normal mass hierarchy (m1 < m2 ≪ m3). Numerical analysis using a realistic supernova and presupernova model allows us to discuss quantitatively a possibility to probe neutrino oscillation parameters. We show that information about the mass hierarchy can be ...

We review neutrino oscillation physics, including the determination of mass splittings and mixings from current solar, atmospheric, reactor and accelerator neutrino data. A brief discussion is given of cosmological and astrophysical implications. Non-oscillation phenomena such as neutrinoless double beta decay would, if discovered, probe the absolute scale of neutrino mass and also reveal their...

We argue how pseudo-Dirac scenario for neutrinos leads to rich neutrino oscillation phenomena, including oscillation inside each generation. The pseudo-Dirac scenario is generalized by incorporating generation mixings and formulae for the various neutrino oscillations are derived. As the application we compare the formulae with the corresponding data. We find that observed pattern of mixings, s...

The major steps in the development of our knowledge about neu-trinos are reviewed. The basics of neutrino oscillation formalism is presented. Neutrino oscillations in the framework of three-neutrino mixing are considered. The evidence for neutrino oscillations is discussed .

We propose the indirect search for the CP violating phase in the long baseline νμ → νe oscillation experiment, in which two scenarios of the neutrino mass hierarchy are discussed in the three family model. The CP violatig phase effect is clearly found in the scenario: the LSND data plus the atmospheric neutrino deficit. The phase dependence of the oscillation probability is explicitly shown by ...

We present an overview of the future projects concerning the neutrino oscillation physics in Europe. Recently a joint CERN–LNGS scientific committee has reviewed several proposals both for the study of atmospheric neutrinos and for long (LBL) and short baseline (SBL) neutrino oscillation experiments. The committee has indicated the priority that the European high energy physics community should...

Within the framework of an SO(10) GUT model that can accommodate both the atmospheric and the LMA solar neutrino mixing solutions, we present explicit predictions for the neutrino oscillation parameters sin 2θ13, sin 2θ12, sin 2 2θ23, and ∆m 2 21. Precise measurements of sin 2 2θ12 and ∆m 2 21 by KamLAND can be used to precisely determine the GUT model parameters. We find that the model can the...

Within the framework of an SO(10) GUT model that can accommodate both the atmospheric and the LMA solar neutrino mixing solutions, we present explicit predictions for the neutrino oscillation parameters sin 2θ13, sin 2θ12, sin 2 2θ23, and ∆m 2 21. Precise measurements of sin 2 2θ12 and ∆m 2 21 by KamLAND can be used to precisely determine the GUT model parameters. We find that the model can the...

If Nature has chosen the vacuum oscillation solution to the Solar neutrino puzzle, a key theoretical challenge is to understand the extreme smallness of the ∆m2νe−νX (∼ 10 −10 eV2) required for the purpose. We find that in a class of models such as [SU(3)]3 or its parent group E6, which contain one sterile neutrino, νis for each family, the ∆m 2 νi−νis is proportional to the cube of the lepton ...