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Measurement of Atmospheric Neutrino Oscillations with IceCube
Aartsen, M. G. Besson, David Zeke IceCube Collaboration
Aartsen, M. G.
Besson, David Zeke
IceCube Collaboration
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Abstract
We present the first statistically significant detection of neutrino oscillations in the high-energy regime (>20 GeV) from an analysis of IceCube Neutrino Observatory data collected in 2010 and 2011. This measurement is made possible by the low-energy threshold of the DeepCore detector (∼20 GeV) and benefits from the use of the IceCube detector as a veto against cosmic-ray-induced muon background. The oscillation signal was detected within a low-energy muon neutrino sample (20–100 GeV) extracted from data collected by DeepCore. A high-energy muon neutrino sample (100 GeV–10 TeV) was extracted from IceCube data to constrain systematic uncertainties. The disappearance of low-energy upward-going muon neutrinos was observed, and the nonoscillation hypothesis is rejected with more than 5σ significance. In a two-neutrino flavor formalism, our data are best described by the atmospheric neutrino oscillation parameters |Δm232|=(2.3+0.6−0.5)×10−3 eV2 and sin2(2θ23)>0.93, and maximum mixing is favored.
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2013-08-19
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American Physical Society
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M. G. Aartsen et al. (IceCube Collaboration). "Measurement of Atmospheric Neutrino Oscillations with IceCube
Phys. Rev. Lett. 111, 081801 – Published 19 August 2013" http://dx.doi.org/10.1103/PhysRevLett.111.081801