An improved measurement of muon antineutrino disappearance in MINOS

Details An improved measurement of muon antineutrino disappearance in MINOS An improved measurement of muon antineutrino disappearance in MINOS

2012-02-13

arxiv.org/abs/1202.2772v1

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures. In submission to Phys.Rev.Lett

Scientific paper

We report an improved measurement of muon anti-neutrino disappearance over a distance of 735km using the MINOS detectors and the Fermilab Main Injector neutrino beam in a muon anti-neutrino enhanced configuration. From a total exposure of 2.95e20 protons on target, of which 42% have not been previously analyzed, we make the most precise measurement of the anti-neutrino "atmospheric" delta-m squared = 2.62 +0.31/-0.28 (stat.) +/- 0.09 (syst.) and constrain the anti-neutrino atmospheric mixing angle >0.75 (90%CL). These values are in agreement with those measured for muon neutrinos, removing the tension reported previously.

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