Results from atmospheric neutrino oscillations with IceCube DeepCore

We present preliminary results on the measurement of neutrino oscillations with three years of data of the completed IceCube Neutrino Observatory. With an energy threshold of about 10 GeV, the detector is sensitive to the disappearance of atmospheric muon neutrinos. The effect is measured using a sample of high-quality muon neutrino events that interact in DeepCore, a region of denser instrumentation. In a livetime of 953 days, 5174 events are found with expectation of 6980 without oscillations. The energy−zenith angle distribution of the events is analyzed yielding the best-fit oscillation parameters sin2 (θ23) = 0.51 ± 0.09 and Δm322=2.68−0.18+0.19×10−3eV2 (normal mass hierarchy assumed). The result achieves a precision similar to that of the Super-Kamiokande experiment, which also analyzes atmospheric neutrinos but at lower energies.