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All-flavour search for neutrinos from dark matter annihilations in the Milky Way with IceCube/DeepCore

CollaborationWith : Christov, Asen / Montaruli, Teresa / Rameez, Mohamed / Vallecorsa, Sofia
Published in The European Physical Journal. C, Particles and Fields. 2016, vol. 76, no. 10, p. 531
Collection Open Access - SCOAP3
Abstract We present the first IceCube search for a signal of dark matter annihilations in the Milky Way using all-flavour neutrino-induced particle cascades. The analysis focuses on the DeepCore sub-detector of IceCube, and uses the surrounding IceCube strings as a veto region in order to select starting events in the DeepCore volume. We use 329 live-days of data from IceCube operating in its 86-string configuration during 2011–2012. No neutrino excess is found, the final result being compatible with the background-only hypothesis. From this null result, we derive upper limits on the velocity-averaged self-annihilation cross-section, ⟨σAv⟩ , for dark matter candidate masses ranging from 30 GeV up to 10 TeV, assuming both a cuspy and a flat-cored dark matter halo profile. For dark matter masses between 200 GeV and 10 TeV, the results improve on all previous IceCube results on ⟨σAv⟩ , reaching a level of 10 -23 cm 3 s -1 , depending on the annihilation channel assumed, for a cusped NFW profile. The analysis demonstrates that all-flavour searches are competitive with muon channel searches despite the intrinsically worse angular resolution of cascades compared to muon tracks in IceCube.
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ICECUBE COLLABORATION. All-flavour search for neutrinos from dark matter annihilations in the Milky Way with IceCube/DeepCore. In: The European Physical Journal. C, Particles and Fields, 2016, vol. 76, n° 10, p. 531. https://archive-ouverte.unige.ch/unige:88164

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Deposited on : 2016-10-12

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