Measurement of the $ν_μ$ energy spectrum with IceCube-79

• Published in: The European Physical Journal C
• Main Authors: Collaboration, IceCube, Sarkar, S
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Springer Verlag 2017
• Subjects: South Pole; South pole
• Online Access: https://doi.org/10.1140/epjc/s10052-017-5261-3; https://ora.ox.ac.uk/objects/uuid:ce359695-7dce-412b-a3d7-3a438e7b83c0

IceCube is a neutrino observatory deployed in the glacial ice at the geographic South Pole. The $\nu_\mu$ energy unfolding described in this paper is based on data taken with IceCube in its 79-string configuration. A sample of muon neutrino charged-current interactions with a purity of 99.5\% was selected by means of a multivariate classification process based on machine learning. The subsequent unfolding was performed using the software \truee. The resulting spectrum covers an E_$\nu$-range of more than four orders of magnitude from 125 GeV to 3.2 PeV. Compared to the Honda atmospheric neutrino flux model, the energy spectrum shows an excess of more than $1.9\,\sigma$ in four adjacent bins for neutrino energies $E_\nu\geq177.8\$,TeV. The obtained spectrum is fully compatible with previous measurements of the atmospheric neutrino flux and recent IceCube measurements of a flux of high-energy astrophysical neutrinos.