Fig. 1: Zenith angular distribution of the atmospheric muon neutrino events in the IC86 sample. | Nature Physics

Fig. 1: Zenith angular distribution of the atmospheric muon neutrino events in the IC86 sample.

From: Neutrino tomography of Earth

Fig. 1

a, Schematic representation of the Earth subdivided into the five concentric layers used in this work. Some representative neutrino trajectories and their associated zenith angles, θz, with respect to the IceCube detector are also indicated. b, Number of atmospheric up-going muon neutrino events collected in the first year of IceCube data-taking as a function of the cosine of the zenith angle \(\theta _{\rm z}^{{\mathrm{rec}}}\) for different reconstructed muon energy thresholds. The uppermost curve shows the zenith distribution for the entire IC86 sample (that is, 20,145 muons in the energy range \(400\,{\mathrm{GeV}} \lesssim E_\mu ^{{\mathrm{rec}}} \lesssim 20\,{\mathrm{TeV}}\)) and the lowermost curve corresponds to the highest threshold in this plot, \(E_\mu ^{{\mathrm{rec}}} > 2.5\,{\mathrm{TeV}}\). Up-going neutrinos correspond to \({\mathrm{cos}}\,\theta _{\rm z}^{{\mathrm{rec}}} = - 1\). For all the data points the error bars represent one standard statistical deviation.

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