Atmospheric and Solar neutrinos in the light of the SuperKamiokande results

Details Atmospheric and Solar neutrinos in the light of the SuperKamiokande results Atmospheric and Solar neutrinos in the light of the SuperKamiokande results

1999-01-07

arxiv.org/abs/hep-ph/9901241v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, lecture at Erice 98

Scientific paper

The hierarchy $\Delta m^2_{atm} \gg \Delta m^2_\odot$ and the large $\theta_{23}$ mixing angle, as suggested by neutrino oscillation experiments, can be accounted for by a variety of lepton flavour models. A dichotomy emerges: i) Models were all neutrino masses are bounded by $m_{atm}\equiv (\Delta m^2_{atm})^{1/2}\approx 0.03 eV$; ii) Models of quasi-degenerate neutrinos. It is shown how these different patterns of neutrino masses may arise from different lepton flavour symmetries. Physical implications are discussed in the various cases.

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