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Ackermann, M.; Altmann, D.; Auffenberg, J.; Barwick, S. W.; Becker Tjus, J.; Becker, K.-H.; Binder, G.; Bindig, D.; Blaufuss, E.; Böser, S.; Christy, B.; Clark, K.; Classen, L.; Coenders, S.; Cruz Silva, A. H.; Daughhetee, J.; Davis, J. C.; de Vries, K. D.; DeYoung, T.; Eberhardt, B.; Fedynitch, A.; Feintzeig, J.; Fischer-Wasels, T.; Flis, S.; Franckowiak, A.; Gaisser, T. K.; Gerhardt, L.; Glüsenkamp, T.; Goldschmidt, A.; Gretskov, P.; Hallen, P.; Halzen, F.; Helbing, K.; Hickford, S.; Hill, G. C.; Hoffman, K. D.; Hoffmann, R.; Hoshina, K.; Hultqvist, K.; Hussain, S.; Jurkovic, M.; Kaminsky, B.; Karle, A.; Kiryluk, J.; Kläs, J.; Köhne, J.-H.; Köpke, L.; Koskinen, D. J.; Kurahashi, N.; Labare, M.; Larsen, D. T.; Lünemann, J.; Macías, O.; Madsen, J.; Meli, A.; Miarecki, S.; Middell, E.; Morse, R.; Nahnhauer, R.; Nowicki, S. C.; Palczewski, T.; Penek, Ö.; Pfendner, C.; Pieloth, D.; Posselt, J.; Price, P. B.; Rees, I.; Rhode, W.; Richman, M.; Riedel, B.; Rongen, M.; Ruhe, T.; Ruzybayev, B.; Sander, H.-G.; Santander, M.; Sarkar, S.; Schatto, K.; Schmidt, T.; Schönwald, A.; Schulte, L.; Smith, M. W. E.; Spiczak, G. M.; Stasik, A.; Stokstad, R. G.; Strahler, E. A.; Strotjohann, N. L.; Toale, P. A.; Tobin, M. N.; Tosi, D.; Unger, E.; Vallecorsa, S.; Voge, M.; Wellons, M.; Wendt, C.; Wichary, C.; Wolf, M.; Xu, D. L.; Yanez, J. P.; Zarzhitsky, P.; Zierke, S.
The European physical journal. C, Particles and fields, 2015/1, Letnik: 75, Številka: 1Journal Article
Dark matter which is bound in the Galactic halo might self-annihilate and produce a flux of stable final state particles, e.g. high energy neutrinos. These neutrinos can be detected with IceCube, a cubic-kilometer sized Cherenkov detector. Given IceCube’s large field of view, a characteristic anisotropy of the additional neutrino flux is expected. In this paper we describe a multipole method to search for such a large-scale anisotropy in IceCube data. This method uses the expansion coefficients of a multipole expansion of neutrino arrival directions and incorporates signal-specific weights for each expansion coefficient. We apply the technique to a high-purity muon neutrino sample from the Northern Hemisphere. The final result is compatible with the null-hypothesis. As no signal was observed, we present limits on the self-annihilation cross-section averaged over the relative velocity distribution ⟨ σ A v ⟩ down to 1.9 × 10 - 23 cm 3 s - 1 for a dark matter particle mass of 700–1,000 GeV and direct annihilation into ν ν ¯ . The resulting exclusion limits come close to exclusion limits from γ -ray experiments, that focus on the outer Galactic halo, for high dark matter masses of a few TeV and hard annihilation channels.
