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Multipole analysis of IceCube data to search for dark matter accumulated in the Galactic halo
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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2015 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 75, no 1, 20Article in journal (Refereed) Published
Abstract [en]

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 <sigma(A)v > down to 1.9x10(-23) cm(3) s(-1) for a dark matter particle mass of 700-1,000 GeV and direct annihilation into nu(nu) over bar. The resulting exclusion limits come close to exclusion limits from gamma-ray experiments, that focus on the outer Galactic halo, for high dark matter masses of a few TeV and hard annihilation channels.

Place, publisher, year, edition, pages
2015. Vol. 75, no 1, 20
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Physical Sciences
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URN: urn:nbn:se:su:diva-115457DOI: 10.1140/epjc/s10052-014-3224-5ISI: 000348992100002OAI: oai:DiVA.org:su-115457DiVA: diva2:798666
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AuthorCount:301;

Available from: 2015-03-27 Created: 2015-03-24 Last updated: 2017-12-04Bibliographically approved

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Ahrens, MaryonBohm, ChristianDanninger, MatthiasFinley, ChadFlis, SamuelHulth, Per OlofHultqvist, KlasWalck, ChristianWolf, MartinZoll, Marcel
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