Charge-Separated Atmospheric Neutrino-Induced Muons in the MINOS Far Detector

Abstract

We found 140 neutrino-induced muons in 854.24 live days in the MINOS far detector. We looked for evidence of neutrino disappearance in this data set by computing the ratio of the number of low momentum muons to the sum of the number of high momentum and unknown momentum muons for both data and Monte Carlo expectation in the absence of neutrino oscillations. The ratio of data and Monte Carlo ratios is consistent with an oscillation signal. A fit to the data for the oscillation parameters excludes the null oscillation hypothesis at the 94% confidence level. We separated the muons by charge sign in both the data and Monte Carlo events and found the ratio of the total number of negative to positive muons in both samples. The ratio of those ratios is a test of CPT conservation. The result is consistent with CPT conservation.

14 pages, 15 figures

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• First direct observation of muon antineutrino disappearance
• Identifying the Neutrino mass Ordering with INO and NOvA
• Measurements of atmospheric neutrinos and antineutrinos in the MINOS Far Detector
• An intermediate gamma beta-beam neutrino experiment with long baseline
• Apparent multiple Delta m^2_32 in muon anti-neutrino and muon neutrino survival oscillations from non-standard interaction matter effect
• Neutrino hierarchy from CP-blind observables with high density magnetized detectors
• MINOS neutrino oscillation results
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• A Bayesian technique for improving the sensitivity of the atmospheric neutrino L/E analysis
• Light Higgs boson scenario in the SUSY seesaw model
• Testing the RRPP vertex of effective Regge action