Improved statistics in the search for ν¯μ→ν¯e oscillations in MiniBooNE

A search for ν¯μ→ν¯e oscillations in the MiniBooNE experiment at Fermilab has been completed using 11.27×1020 protons on target (POT), roughly doubling the statistics over prior published results. An excess of 78±30.8 events is observed in the signal region. The results from the fit to a simple two-neutrino mixing hypothesis are reported for the full antineutrino data sample and compared to prior results acquired with a neutrino beam. A simultaneous fit to both samples is performed fully accounting for systematic correlations, resulting in a 3.8σ overall excess of 240.3±34.5(stat)±52.6(syst) events