Neutrino Mixing and Oscillations in 1999 and Beyond

Abstract

The interpretation of the existing experimental evidences for oscillations of neutrinos in schemes with three and four neutrino mixing is reviewed. Forms of the lepton mixing matrix allowed by the neutrino oscillation data are considered. The possible neutrino mass spectra compatible with the observations are analyzed. The possibility to obtain information about the neutrino mass spectrum from the future ${}^3$H $\beta -$decay and $(\beta \beta {)}_{0\nu }-$decay experiments is also considered.

Comments: 16 pages, LATEX, uses sprocl.sty. Invited talk given at the International Workshop on Weak Interaction and Neutrinos, January 25 - 30, 1999, Cape Town, South Africa; to be published in the Proceedings of the Workshop