Neutrino Oscillations at Accelerators and the Implications

Negative results from CHORUS and NOMAD and positive results--reinforced by a new analysis--from LSND makes ever more likely the four-neutrino model needed for the solar ν_e deficit and the atmospheric ν_e/ν_μ anomaly. The SNO and MiniBooNE experiments will further test this model, which also seems needed to allow supernovae production of the heaviest elements. Fitting all solar data--difficult in any model--is successful if the necessary sterile neutrino is a bulk neutrino in extra dimensions.