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The deployment of DeepCore array significantly lowers IceCu be’s energy threshold to about 10 GeV and enhances the sensitivity of detecting neutrinos fro m annihilations and decays of light dark matter. To match this experimental development, we pro vide a complete analysis of track and cascade event rates in DeepCore array due to neutrino flux produced by annihilations and decays of galactic dark matter. We also calculate the backgr ound event rates due to atmospheric neutrino flux for evaluating the sensitivity of DeepCore arr ay to galactic dark matter signatures. Unlike previous approaches, which set the energy threshold for track and cascade events at around 50 GeV (this choice makes the estimation of atmospheric back ground event rate much simpler, i.e., the oscillation effect in atmospheric neutrino flux ca n be neglected), we have set the energy threshold at 10 GeV to take the full advantage of DeepCore arr ay. We compare our calculated sensitivity with those obtained by setting a 50 GeV threshol d energy. We conclude that our choice of threshold energy significantly improves the sensitivity to dark matter signature for WIMP mass below 100 GeV.

Probing annihilations and decays of low-mass galactic dark matter by track and cascade events in IceCube DeepCore