A Combined ${\nu }_{\mu }\to {\nu }_e$ and ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ Oscillation Analysis of the MiniBooNE Excesses

Abstract

The MiniBooNE experiment at Fermilab reports results from an analysis of the combined ${\nu }_e$ and ${\bar{\nu }}_e$ appearance data from $6.46\times 10^{20}$ protons on target in neutrino mode and $11.27\times 10^{20}$ protons on target in antineutrino mode. A total excess of $240.3\pm 34.5\pm 52.6$ events ($3.8\sigma$) is observed from combining the two data sets in the energy range $200<E_{\nu }^{QE}<1250$ MeV. In a combined fit for CP-conserving ${\nu }_{\mu }\to {\nu }_e$ and ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ oscillations via a two-neutrino model, the background-only fit has a ${\chi }^2$-probability of 0.03% relative to the best oscillation fit. The data are consistent with neutrino oscillations in the $0.01<\Delta m^2<1.0$ eV${}^2$ range and with the evidence for antineutrino oscillations from the Liquid Scintillator Neutrino Detector (LSND).

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