Evidence for $\barν_μ\to\barν_e$ Oscillations from the LSND Experiment at LAMPF

Details Evidence for $\barν_μ\to\barν_e$ Oscillations from the LSND Experiment at LAMPF Evidence for $\barν_μ\to\barν_e$ Oscillations from the LSND Experiment at LAMPF

1996-05-09

arxiv.org/abs/nucl-ex/9605003v1

Phys.Rev.Lett.77:3082-3085,1996

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, revtex, psfig. additional information available at http://nu1.lampf.lanl.gov/~lsnd/

Scientific paper

10.1103/PhysRevLett.77.3082

A search for $\bar\nu_{\mu}\to \bar\nu_{e}$ oscillations has been conducted at the Los Alamos Meson Physics Facility by using $\bar\nu_\mu$ from $\mu^+$ decay at rest. The $\bar\nu_e$ are detected via the reaction $\bar\nu_e\,p \rightarrow e^{+}\,n$, correlated with a $\gamma$ from $np\rightarrow d\gamma$ ($2.2\,{\rm MeV}$). The use of tight cuts to identify $e^+$ events with correlated $\gamma$ rays yields 22 events with $e^+$ energy between 36 and $60\,{\rm MeV}$ and only $4.6 \pm 0.6$ background events. A fit to the $e^+$ events between 20 and $60\,{\rm MeV}$ yields a total excess of $51.8^{+18.7}_{-16.9} \pm 8.0$ events. If attributed to $\bar \nu_\mu \rightarrow \bar \nu_e$ oscillations, this corresponds to an oscillation probability of ($0.31^{+0.11}_{-0.10} \pm 0.05$)\%.

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