OSCILLATION SEARCHES WITH LABORATORY NEUTRINOS - THEORETICAL ASPECTS

Neutrino oscillations searches with laboratory beams from accelerators or reactors explore several flavor transition channels, and thus cann ot be globally analysed in a simplistic two-flavor approach. A three-n eutrino spectrum with two widely different mass gaps provides a simple and natural scheme to analyse both positive and negative oscillation searches. In this scheme, the possible patterns of neutrino masses and mixing are strongly constrained by the recent results of the Chooz re actor experiment. The ''surviving'' scenarios predict distinct signatu res that can be probed in future short or long baseline laboratory exp eriments.