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

Fei-Fan Lee and Guey-Lin Lin

  • Institute of Physics, National Chiao-Tung University, Hsinchu 30010, Taiwan

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Phys. Rev. D 85, 023529 – Published 25 January, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.023529

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 the 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 the oscillation effect in the estimation of atmospheric background event rate), we have set the energy threshold at 10 GeV to take 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 mχ<100  GeV in the annihilation scenario and mχ<300  GeV in the decay scenario.

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Phys. Rev. D 85, 023529– Published 25 January, 2012
  • Received 5 July 2011

© 2012 American Physical Society

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