Neutrino masses and mixing from neutrino oscillation experiments

Abstract

What information about the neutrino mass spectrum and mixing matrix can be inferred from the existing neutrino oscillation data? We discuss here the answer to this question in the case of mixing of three and four neutrinos. We present the constraints on the effective Majorana mass <m> that can be obtained from the results of reactor neutrino oscillation experiments and from atmospheric neutrino data. We discuss the bounds on the oscillation probabilities in long-baseline neutrino oscillation experiments that follow from the results of short-baseline experiments. Some remarks on a model-independent approach to the solar neutrino problem are also made.