| Abstract: | We present a measurement of neutrino oscillations via atmospheric muon
neutrino disappearance with three years of data of the completed IceCube
neutrino detector. DeepCore, a region of denser instrumentation, enables the
detection and reconstruction of atmospheric muon neutrinos between 10,GeV and
100,GeV, where a strong disappearance signal is expected. The detector volume
surrounding DeepCore is used as a veto region to suppress the atmospheric muon
background. Neutrino events are selected where the detected Cherenkov photons
of the secondary particles minimally scatter, and the neutrino energy and
arrival direction are reconstructed. Both variables are used to obtain the
neutrino oscillation parameters from the data, with the best fit given by
$Delta m^2_{32}=2.72^{+0.19}_{-0.20} imes 10^{-3},mathrm{eV}^2$ and
$sin^2 heta_{23} = 0.53^{+0.09}_{-0.12}$ (normal mass hierarchy assumed). The
results are compatible and comparable in precision to those of dedicated
oscillation experiments. |
REGISTER
Did you like this article? 
