3-neutrino Oscillations, Past Present and Future

Abstract

After a first part devoted to the description of the main steps in the discovery of neutrino oscillations, in the second part the results of a recent global analysis of solar, reactor, accelerator and atmospheric neutrino oscillation experiments is reported, searching for the first indications about the still unknown parameters, the mass hierarchy, the θ 23 octant and the CP-violating phase δ .Concerning the hierarchy, no significant difference emerges between normal and inverted mass ordering.A slight overall preference is found for θ 23 in the first octant and for nonzero CP violation with sin δ < 0. In the third part the prospects of the future experimental searches for θ 13 , θ 13 and its octant, δ CP and the neutrino mass hierarchy:sign(∆m 2 ) are briefly discussed.