Candidate Events in a Search for ${\bar{ν}}_{μ} \to \bar{ν}_{e}$ Oscillations

2 October 1995

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 75 (14) , 2650-2653
https://doi.org/10.1103/physrevlett.75.2650

Abstract

A search for

{\bar{ν}}_{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

{\bar{ν}}_{e}

are detected via

{\bar{ν}}_{e} p \to e^{+} n

with

e^{+}

energy between 36 and

60 MeV

, followed by a

γ

ray from

np \to d γ

(

2.2 MeV

). Using strict cuts to identify

γ

rays correlated with

e^{+}

yields 9 events with only

2.1 \pm 0.3

background expected. A likelihood fit to the entire

e^{+}

sample results in a total excess of

{16.4}_{- 8.9}^{+ 9.7} \pm 3.3

events. If attributed to

{\bar{ν}}_{μ} \to {\bar{ν}}_{e}

oscillations, this corresponds to an oscillation probability of (

{0.34}_{- 0.18}^{+ 0.20} \pm 0.07

)%.

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Candidate Events in a Search forν¯μ→ν¯eOscillations

Abstract

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Candidate Events in a Search for ${\bar{ν}}_{μ} \to \bar{ν}_{e}$ Oscillations