ACCELERATOR, REACTOR AND ATMOSPHERIC NEUTRINO DATA - A 3-FLAVOR OSCILLATION ANALYSIS

We perform a three-flavor oscillation analysis of accelerator, reactor and atmospheric neutrino results. Motivated by the experimental data, the mass squared differences are chosen to be Delta(12) = Delta(13) i n the range 0.5-10 eV(2) and Delta(23) = 10(-2) eV(2). In such a scena rio, the oscillation probabilities for the accelerator and reactor neu trinos involve only two of the mixing angles and one mass scale. But t he atmospheric neutrino oscillation is governed by both mass scales an d all the three mixing angles. The greater latitude allowed by the sch eme leads to some new and interesting solution regions for atmospheric neutrinos in addition to the two-flavor limits usually discussed. How ever, incorporating the constraints from the previous accelerator sear ches for neutrino oscillations, a very narrow range of allowed mixing angles survives. This zone is beyond the reach of the ongoing accelera tor experiments CHORUS and NOMAD with their projected sensitivity.