An Alternative Analysis of the LSND Neutrino Oscillation Search Data on ν̅ _μ→ν̅ _e

This analysis of data from the Liquid Scintillator Neutrino Detector (LSND) at the Los Alamos Meson Physics Facility (LAMPF) sets bounds on neutrino oscillations in the appearance channel ν̅ _μ→ν̅ _e by searching for the signature of the reaction ν̅ _ep→e⁺n: an e⁺ followed by a 2.2 MeV γ ray from neutron capture. Five e^±- γ coincidences are observed in time with the LAMPF beam, with an estimated background of 6.2 events. The 90% confidence limits obtained in this analysis are Δm²<0.07 eV² for sin²2θ  =  1, and sin²2θ<6×10^-3 for Δm²≳20 eV². The possible signal at the edge of the detector's sensitivity is mentioned.