Atmospheric and Solar neutrinos in the light of the SuperKamiokande results
Abstract
Description
The hierarchy $Δm^2_{atm} \gg Δm^2_\odot$ and the large $θ_{23}$ 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 $m_{atm}\equiv (Δm^2_{atm})^{1/2}\approx 0.03 eV$; 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.
8 pages, lecture at Erice 98
8 pages, lecture at Erice 98