Our present knowledge of neutrinos can be summarized in terms of the “standard neutrino scenario”. Phenomenology of this scenario as well as attempts to uncover physics behind neutrino mass and mixing are described. Goals of future studies include complete reconstruction of the neutrino mass and flavor spectrum, further test of the standard scenario and search for new physics beyond it. Develop...

An outline of the present and future long-baseline neutrino facilities with emphasis on the possibilities at CERN is presented. Accelerator-made neutrinos for long-baseline oscillation experiments open the exploration to a broad and rather interesting field of physics experiments, with the measurement of the neutrino mixing angle (θ13), the determination of the sign of neutrino mass hierarchy (...

We propose the new mechanism of neutrino flavour relaxation to explain the experimentally observed changes of initial neutrino flavour fluxes. The test of neutrino relaxation hypothesis is presented, using the data of modern reactor, solar and accelerator experiments. The final choice between the standard neutrino oscillations and the proposed neutrino flavour relaxation model can be done in fu...

Recent experimental data of neutrinos make big impact on the neutrino masses and their mixings. Most exciting one is the results at Super-Kamiokande on the atmospheric neutrinos, which indicate the large neutrino flavor oscillation of νμ → νx . Solar neutrino data also provide the evidence of the neutrino oscillation, however this problem still uncertain . What can we learn from these results? ...

I review promising approaches to neutrino mass models, focussing on three neutrino patterns of neutrino masses and mixing angles, and the corresponding Majorana mass matrices. I discuss the see-saw mechanism, and show how it may be applied in a very natural way to give a neutrino mass hierarchy with large atmospheric and solar angles by assuming single right-handed neutrino dominance. A theoret...

We study neutrino energy emission rates (emissivities) due to electron bremsstrahlung produced by ee and ep collisions in the superfluid neutron star cores. The neutrino emission due to ee collisions is shown to be the dominant neutrino reaction at not too high temperatures (T <∼ 10 8 K) in dense matter if all other neutrino reactions involving nucleons are strongly suppressed by neutron and pr...

We study the RH neutrino properties from the low energy neutrino data in the seesaw mechanism. Reonance behavior is found for the right-handed (RH) mixing angle as a function of light neutrino mass ratios in two favored region of the solar neutrino problem and, at the resonance point, the two corresponding RH Majorana neutrino masses are degenerate. This phenomenon is similar with that in the m...

In analyzing neutrino oscillation experiments it is often assumed that while new physics contributes to neutrino masses, neutrino interactions are given by the Standard Model. We develop a formalism to study new physics effects in neutrino interactions using oscillation experiments. We argue that the notion of branching ratio is not appropriate in this case. We show that a neutrino appearance e...

Future cosmological data may be sensitive to the effects of a finite neutrino mass even as small as the ∼0.05 eV lower limit guaranteed by neutrino oscillation experiments. We show that a cosmological detection of neutrino mass in agreement with expectations would improve by many orders of magnitude the existing limits on neutrino lifetime, and as a consequence on neutrino secret interactions w...

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 .