[SEMINARI]: Prof. Smirnov: Neutrino mass spectra ...

[Arcadi Santamaria]

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                              S E M I N A R I

            [Image]    Departament de Física Teòrica     [Image]
                          Universitat de València
                      46100 Burjassot (València) Spain

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          Neutrino Mass Spectra and $\nu_{\mu} - \nu_s$ Oscillations of
                              Atmospheric Neutrinos

                              Prof. A. Smirnov

                               (ICTP-Trieste)

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                     Aula de Seminaris de Física Teòrica
                    Tuesday 21 of April of 1998 at 04:00
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                                    Resum

Two natural spectra of the neutrino mass based on the see-saw mechanism with
 the intermediate mass scale and the GUT scale are considered. In addition,
 an existence of new light singlet fermion $\nu_s$ is suggested to solve the
     atmospheric neutrino problem. Properties of the $\nu_{\mu} - \nu_s$
 oscillations of the atmospheric neutrinos are studied. In particular, it is
 shown that the parametric resonance occurs in the oscillations of neutrinos
when they cross the core of the Earth. This leads to a peculiar zenith angle
distribution of the upward-going muons which can be relevant for explanation
              of the MACRO, Baksan and Super-Kamiokande data.

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