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Multipole analysis of IceCube data to search for dark matter accumulated in the Galactic halo: IceCube Collaboration

  • Author(s): Aartsen, MG
  • Ackermann, M
  • Adams, J
  • Aguilar, JA
  • Ahlers, M
  • Ahrens, M
  • Altmann, D
  • Anderson, T
  • Arguelles, C
  • Arlen, TC
  • Auffenberg, J
  • Bai, X
  • Barwick, SW
  • Baum, V
  • Beatty, JJ
  • Becker Tjus, J
  • Becker, KH
  • BenZvi, S
  • Berghaus, P
  • Berley, D
  • Bernardini, E
  • Bernhard, A
  • Besson, DZ
  • Binder, G
  • Bindig, D
  • Bissok, M
  • Blaufuss, E
  • Blumenthal, J
  • Boersma, DJ
  • Bohm, C
  • Bos, F
  • Bose, D
  • Böser, S
  • Botner, O
  • Brayeur, L
  • Bretz, HP
  • Brown, AM
  • Casey, J
  • Casier, M
  • Chirkin, D
  • Christov, A
  • Christy, B
  • Clark, K
  • Classen, L
  • Clevermann, F
  • Coenders, S
  • Cowen, DF
  • Cruz Silva, AH
  • Danninger, M
  • Daughhetee, J
  • Davis, JC
  • Day, M
  • de André, JPAM
  • De Clercq, C
  • De Ridder, S
  • Desiati, P
  • de Vries, KD
  • de With, M
  • DeYoung, T
  • Díaz-Vélez, JC
  • Dunkman, M
  • Eagan, R
  • Eberhardt, B
  • Eichmann, B
  • Eisch, J
  • Euler, S
  • Evenson, PA
  • Fadiran, O
  • Fazely, AR
  • Fedynitch, A
  • Feintzeig, J
  • Felde, J
  • Feusels, T
  • Filimonov, K
  • Finley, C
  • Fischer-Wasels, T
  • Flis, S
  • Franckowiak, A
  • Frantzen, K
  • Fuchs, T
  • Gaisser, TK
  • Gallagher, J
  • Gerhardt, L
  • Gier, D
  • Gladstone, L
  • Glüsenkamp, T
  • Goldschmidt, A
  • Golup, G
  • Gonzalez, JG
  • Goodman, JA
  • Góra, D
  • Grandmont, DT
  • Grant, D
  • Gretskov, P
  • Groh, JC
  • Groß, A
  • Ha, C
  • Haack, C
  • Haj Ismail, A
  • Hallen, P
  • et al.
Abstract

© 2015, The Author(s). 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 (Formula Presented.) down to ([Formula Presented.) for a dark matter particle mass of 700–1,000 GeV and direct annihilation into (Formula Presented.). 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.

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