Measurement of the [Formula: see text] energy spectrum with IceCube-79: IceCube Collaboration

• Published in: The European Physical Journal C
• Main Authors: Aartsen, M. G., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Al Samarai, I., Altmann, D., Andeen, K., Anderson, T., Ansseau, I., Anton, G., Archinger, M., Argüelles, C., Auffenberg, J., Axani, S., Bagherpour, H., Bai, X., Barwick, S. W., Baum, V., Bay, R., Beatty, J. J., Becker Tjus, J., Becker, K.-H., BenZvi, S., Berley, D., Bernardini, E., Besson, D. Z., Binder, G., Bindig, D., Blaufuss, E., Blot, S., Bohm, C., Börner, M., Bos, F., Bose, D., Böser, S., Botner, O., Bradascio, F., Braun, J., Brayeur, L., Bretz, H.-P., Bron, S., Burgman, A., Carver, T., Casier, M., Cheung, E., Chirkin, D., Christov, A., Clark, K.
• Format: Text
• Language: English
• Published: Springer Berlin Heidelberg 2017
• Subjects: Regular Article - Experimental Physics; South Pole; South pole
• Online Access: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6956919/; https://doi.org/10.1140/epjc/s10052-017-5261-3

IceCube is a neutrino observatory deployed in the glacial ice at the geographic South Pole. The [Formula: see text] 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[Formula: see text] -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 [Formula: see text] in four adjacent bins for neutrino energies [Formula: see text] . 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.