Evidence for neutrino oscillations from the observation of ν¯e appearance in a ν¯μ beam

A search for ν¯_μ-->ν¯_e oscillations was conducted by the Liquid Scintillator Neutrino Detector at the Los Alamos Neutron Science Center using ν¯_μ from μ⁺ decay at rest. A total excess of 87.9+/-22.4+/-6.0 events consistent with ν¯_ep-->e⁺n scattering was observed above the expected background. This excess corresponds to an oscillation probability of (0.264+/-0.067+/-0.045)%, which is consistent with an earlier analysis. In conjunction with other known limits on neutrino oscillations, the LSND data suggest that neutrino oscillations occur in the 0.2-10 eV²/c⁴ Δm² range, indicating a neutrino mass greater than 0.4 eV/c².