Probing annihilations and decays of low-mass galactic dark matter in IceCube DeepCore array: Track events

Abstract

The deployment of DeepCore array significantly lowers IceCube's energy threshold to about 10 GeV and enhances the sensitivity of detecting neutrinos from annihilations and decays of light dark matter. To match this experimental development, we calculate the track event rate in DeepCore array due to neutrino flux produced by annihilations and decays of galactic dark matter. We also calculate the background event rate due to atmospheric neutrino flux for evaluating the sensitivity of DeepCore array to galactic dark matter signatures. Unlike previous approaches, which set the energy threshold for track events at around 50 GeV (this choice avoids the necessity of including oscillation effect in the estimation of atmospheric background event rate), we have set the energy threshold at 10 GeV to take the full advantage of DeepCore array. We compare our calculated sensitivity with those obtained by setting the threshold energy at 50 GeV. We conclude that our proposed threshold energy significantly improves the sensitivity of DeepCore array to the dark matter signature for $m_{\chi }<100$ GeV in the annihilation scenario and $m_{\chi }<300$ GeV in the decay scenario.

19 pages, 5 figures; match the published version

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Cited by in corpus (5)

• Indirect Searches for Decaying Dark Matter
• Future sensitivity of neutrino telescopes to dark matter annihilations from the cosmic diffuse neutrino signal
• Downward-going tau neutrinos as a new prospect of detecting dark matter
• Sensitivities of IceCube DeepCore Detector to Signatures of Low-Mass Dark Matter in the Galactic Halo
• Constraining dark matter capture and annihilation cross sections by searching for neutrino signature from the Earth core