A Combined $\hat{I}{½}_{\hat{I}}¼\to \hat{I}{½}_e$ and $\bar{\hat{I}}{½}_{\hat{I}}¼\to \bar{\hat{I}}{½}_e$ Oscillation Analysis of the MiniBooNE Excesses

Abstract

The MiniBooNE experiment at Fermilab reports results from an analysis of the combined $\hat{I}{½}_e$ and $\bar{\hat{I}}{½}_e$ 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 ($3.8\ddot{I}ƒ$) is observed from combining the two data sets in the energy range $200<E_{\hat{I}}{½}^{QE}<1250$ MeV. In a combined fit for CP-conserving $\hat{I}{½}_{\hat{I}}¼\to \hat{I}{½}_e$ and $\bar{\hat{I}}{½}_{\hat{I}}¼\to \bar{\hat{I}}{½}_e$ oscillations via a two-neutrino model, the background-only fit has a $\ddot{I}{‡}^2$-probability of 0.03% relative to the best oscillation fit. The data are consistent with neutrino oscillations in the $0.01<\hat{I}”m^2<1.0$ eV${}^2$ range and with the evidence for antineutrino oscillations from the Liquid Scintillator Neutrino Detector (LSND).

Minor wording and figure changes and added references