Three Flavor Neutrino Oscillation Constraints from Accelerator, Reactor, Atmospheric and Solar Neutrino Experiments

We discuss constraints on three flavor neutrino mixings from the accelerator and reactor experiments, the Kamiokande multi-GeV data, and the solar neutrino observations. The LSND result is excluded at 90%CL by the constraints imposed by all the data of reactor and accelerator experiments and the Kamiokande multi-GeV data if the mass scale required for the solution to the solar neutrino problem is hierarchically small. The region of a set of the effective two-flavor mixing parameters (∆m, sin 2θ) is given for the Email: [email protected] Email: [email protected]