Candidate Events in a Search for Muon Antineutrino to Electron Antineutrino Oscillations

Details Candidate Events in a Search for Muon Antineutrino to Electron Antineutrino Oscillations Candidate Events in a Search for Muon Antineutrino to Electron Antineutrino Oscillations

1995-04-20

arxiv.org/abs/nucl-ex/9504002v2

Phys.Rev.Lett.75:2650-2653,1995

Physics

Nuclear Physics

Nuclear Experiment

3 PS figures; corrected TeX file (April 21, 1995)

Scientific paper

10.1103/PhysRevLett.75.2650

A search for $\nuebar$'s in excess of the number expected from conventional sources has been made using the Liquid Scintillator Neutrino Detector, located 30 m from a proton beam dump at LAMPF. A $\nuebar$ signal was detected via the reaction $\nuebar\,p \rightarrow e^{+}\,n$ with $e^+$ energy between 36 and $60\mev$, followed by a $\gamma$ from $np\rightarrow d\gamma$ ($2.2\mev$). Using strict cuts to identify $\gamma$'s correlated with positrons results in a signal of 9 events, with an expected background of $2.1 \pm 0.3$. A likelihood fit to the entire $e^+$ sample yields a total excess of $16.4^{+9.7}_{-8.9}\pm 3.3$ events, where the second uncertainty is systematic. If this excess is attributed to neutrino oscillations of the type $\numubar\rightarrow\nuebar$, it corresponds to an oscillation probability of ($0.34^{+0.20}_{-0.18}\pm 0.07$)\%.

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