Some Phenomenological Aspects of Neutrino Physics

The current high level of interest in neutrino properties is well justified. Neutrino properties (such as masses, mixings, magnetic moments etc.) are of interest for a variety of reasons: (i) in their own right as fundamental parameters and (ii) as harbingers of new physics beyond the standard model (if e.g. mi 6= 0, θi 6= 0, μi 6= 0 etc.). I will not review here the kinematic limits on masses but concentrate on the current evidence for mixing and oscillations. First we summarize some salient features of neutrino oscillations. For two flavor mixing (say νe and νμ), the standard forms for survival probability and conversion probability are given by