First Observation of Accelerator Muon Antineutrinos in MINOS

Details First Observation of Accelerator Muon Antineutrinos in MINOS First Observation of Accelerator Muon Antineutrinos in MINOS

2009-10-19

arxiv.org/abs/0910.3439v1

Physics

High Energy Physics

High Energy Physics - Experiment

To be published in the proceedings of the DPF-2009 conference, Detroit, MI, July 27-31, 2009, eConf C090726. 6 pages and 9 fig

Scientific paper

We report the first direct observation of muon antineutrinos in the MINOS Far Detector in the current muon-neutrino dominated beam. The magnetic field of the detector is utilized to separate muon neutrinos and antineutrinos event-by-event by identifying the charge sign of the muon created in charged-current interactions. We present preliminary results on the muon antineutrino oscillation parameters as well as limit on the fraction of neutrinos that disappear and reappear as antineutrinos. We also discuss the prospect of the measurement when the polarity of the magnetic focusing horns will be reversed to create a dedicated muon antineutrino beam.

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