MiniBooNE Oscillation Results 2011

TL;DR

The MiniBooNE experiment at Fermilab reports updated results on antineutrino oscillations, observing an excess of events that supports LSND-like oscillation signals with increased statistical significance.

Contribution

This paper provides the most recent high-statistics results on $ar u_ ext{mu} ightarrow ar u_ ext{e}$ oscillations, strengthening evidence for neutrino oscillation anomalies.

Findings

Observed an excess of 57.7 ± 28.5 events in the 200 MeV to 3 GeV energy range.

Data favor LSND-like oscillations over background-only hypothesis at 91.1% confidence level.

Increased data sample by 52% compared to previous 2010 results.

Abstract

The MiniBooNE neutrino oscillation search experiment at Fermilab has recently updated results from a search for $\bar\nu_\mu \rightarrow \bar\nu_e$ oscillations, using a data sample corresponding to $8.58 \times 10^{20}$ protons on target in anti-neutrino mode. This high statistics result represent an increase in statistics of 52% compared to result published in 2010. An excess of 57.7 $\pm$ 28.5 events is observed in the energy range 200 MeV $< E_\nu <$ 3000 MeV. The data favor LSND-like $\bar\nu_\mu \rightarrow \bar\nu_e$ oscillations over a background only hypothesis at 91.1% confidence level in the energy range 475 $< E_\nu< $3000 MeV.