Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 80: Neutrinophysik VIII

T 80.7: Vortrag

Donnerstag, 22. März 2018, 18:05–18:20, Z6 - HS 0.001

Model Independent Measurement of the Atmospheric Muon Neutrino Energy Spectrum with 3 Years of IceCube Data — •Mathis Börner, Mirco Huennefeld, Tobias Hoinka, Thorben Menna, and Maximillian Meier for the IceCube collaboration — U Dortmund, Lehrstuhl für Experimentelle Physik 5b, Otto-Hahn-Straße 4a, 44227 Dortmund

The main array of the IceCube neutrino observatory is the largest running neutrino detector in the world and covers neutrino energies starting at a few hundred GeV and ending in the PeV region. This allowed to prove the existence of astrophysical neutrinos and now with increasing data to probe the detailed spectral shape of the different flux components. In this contribution a model independent unfolding of the muon neutrino spectrum between 125 GeV and 2.5 PeV is presented. This covers the transition between an atmospheric to an astrophysical dominated spectrum.

The analysis consists of a selection to obtain a sample of muon neutrino events and a subsequent unfolding. The event selection utilizes modern machine learning techniques to achieve maximal efficiency while preserving a signal purity over 99%. For the first time in IceCube, data from multiple years are used in a dedicated unfolding analysis. In conjunction with the efficient event selection this analysis provides the most precise model independent measurement of the muon neutrino flux in this energy region.