Candidate events in a search for anti-muon-neutrino ---> anti-electron-neutrino oscillations

A search for ${\\overline{\\ensuremath{\\nu}}}_{e}$'s in excess of the number expected from conventional sources has been made using the Liquid Scintillator Neutrino Detector, located 30 m behind the Los Alamos Meson Physics Facility beam stop. The ${\\overline{\\ensuremath{\\nu}}}_{e}$ are detected via ${\\overline{\\ensuremath{\\nu}}}_{e}p\\ensuremath{\\rightarrow}{e}^{+}n$ with ${e}^{+}$ energy between 36 and $60\\mathrm{MeV}$, followed by a $\\ensuremath{\\gamma}$ ray from $\\mathrm{np}\\ensuremath{\\rightarrow}d\\ensuremath{\\gamma}$ ( $2.2\\mathrm{MeV}$). Using strict cuts to identify $\\ensuremath{\\gamma}$ rays correlated with ${e}^{+}$ yields 9 events with only $2.1\\ifmmode\\pm\\else\\textpm\\fi{}0.3$ background expected. A likelihood fit to the entire ${e}^{+}$ sample results in a total excess of ${16.4}_{\\ensuremath{-}8.9}^{+9.7}\\ifmmode\\pm\\else\\textpm\\fi{}3.3$ events. If attributed to ${\\overline{\\ensuremath{\\nu}}}_{\\ensuremath{\\mu}}\\ensuremath{\\rightarrow}{\\overline{\\ensuremath{\\nu}}}_{e}$ oscillations, this corresponds to an oscillation probability of ( ${0.34}_{\\ensuremath{-}0.18}^{+0.20}\\ifmmode\\pm\\else\\textpm\\fi{}0.07$)%.