Limits on neutrino masses and mixing parameters

There is no compelling reasons why neutrinos should be massless in nature. In fact there is a growing feeling in the High Energy Physics community, greatly supported by the so called 'neutrino anomalies', that neutrinos physics constitute, in a near future, a window beyond the standard model of electroweak interactions. The number of dedicated neutrino experiments that proliferated in the last few years is no doubt result of this belief. Theoretically, there are many extensions of the standard model in which neutrinos are endowed with a mass. Unfortunately, in all of these models the mass scale is rather arbitrary and almost any scenario can be realized. As usual this input will have ultimately to come from experiment. Here we will review the most recent limits on neutrino masses and oscillation parameters coming from accelerator, reactors and double beta decay experiments. (author)