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

CollaborationWith : Aguilar, J. A. / Christov, Asen / Montaruli, Teresa / Rameez, Mohamed / Vallecorsa, Sofia
Published in European Physical Journal. C. 2015, vol. 75, no. 1, p. 20
Collection Open Access - SCOAP3
Abstract 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 ⟨σAv⟩ down to 1.9×10-23cm3s-1 for a dark matter particle mass of 700–1,000 GeV and direct annihilation into νν¯ . 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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ICECUBE COLLABORATION. Multipole analysis of IceCube data to search for dark matter accumulated in the Galactic halo. In: European Physical Journal. C, 2015, vol. 75, n° 1, p. 20. https://archive-ouverte.unige.ch/unige:55743

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Deposited on : 2015-04-27

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