Neutrino oscillations with LSND

The Liquid Scintillator Neutrino Detector (LSND) at the Los Alamos Meson Physics Facility (LAMPF) has conducted searches for ν-barμ → ν-bare oscillations using ν-barμ from μ+ decay at rest (DAR) and for νμ → νe oscillations using νμ from π+ decay in flight (DIF). For the 1993-1995 data taking period, significant beam-excess events have been found in both oscillation channels. For the DAR search, a total excess of 51.8+18.7-16.9 ± 8.0 events from the ν-bare p → e+ n inverse β-decay reaction is observed, with e+ energies between 20-60 MeV. For the DIF search, a total excess of 18.1 ± 6.6 ± 4.0 events from the νe C → e- X inclusive reaction is observed, with e- energies between 60-200 MeV. If interpreted as neutrino oscillations, these excesses correspond to oscillation probabilities of (3.1±1.2±0.5) x 10-3 and (2.6 ± 1.0 ± 0.5) x 10-3, respectively. Additional data collected during the 1996-1998 runs has been preliminarily analyzed for the DAR channel and yields very good agreement with the previously obtained results, for a combined oscillation probability of (3.3±0.9±0.5) x 10-3