First direct observation of muon antineutrino disappearance

Details First direct observation of muon antineutrino disappearance First direct observation of muon antineutrino disappearance

2011-04-03

arxiv.org/abs/1104.0344v4

Phys.Rev.Lett.107:021801,2011

Physics

High Energy Physics

High Energy Physics - Experiment

Six pages, four figures. This version published by Physical Review Letters

Scientific paper

10.1103/PhysRevLett.107.021801

This letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for muon antineutrino production, accumulating an exposure of $1.71\times 10^{20}$ protons on target. In the Far Detector, 97 charged current muon antineutrino events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at $6.3\sigma$. The best fit to oscillation yields $\Delta \bar{m}^{2}=(3.36^{+0.46}_{-0.40}\textrm{(stat.)}\pm0.06\textrm{(syst.)})\times 10^{-3}\,\eV^{2}$, $\sin^{2}(2\bar{\theta})=0.86^{+0.11}_{-0.12}\textrm{(stat.)}\pm0.01\textrm{(syst.)}$. The MINOS muon neutrino and muon antineutrino measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.

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