Abstract
It is assumed that heavy dark matter particles (HDMs) with a mass of O(TeV) are captured by the Sun. HDMs can decay to relativistic light dark matter particles (LDMs), which could be measured by km3 neutrino telescopes (like the IceCube detector). The numbers and fluxes of expected LDMs and neutrinos were evaluated at IceCube with the Z′ portal dark matter model. Based on the assumption that no events are observed at IceCube in 6 years, the corresponding upper limits on LDM fluxes were calculated at 90% C. L.. These results indicated that LDMs could be directly detected in the O(1TeV)-O(10TeV) energy range at IceCube with 100 GeV ≲ mZ′ ≲ 350 GeV and τϕ ≲ 5 × 1022ṡ.
Highlights
The numbers and fluxes of expected light dark matter particles (LDMs) and neutrinos were evaluated at IceCube with the Z′ portal dark matter model
heavy dark matter particles (HDMs) can decay to relativistic light dark matter particles (LDMs), which could be measured by km3 neutrino telescopes
Since the LDM and neutrino cascades are hard to distinguish at IceCube, one could only evaluate the number of expected neutrinos fallen into those windows
Summary
The numbers and fluxes of expected LDMs and neutrinos were evaluated at IceCube with the Z′ portal dark matter model. The distributions and numbers of expected LDMs and neutrinos will be evaluated in the energy range 1–100 TeV assuming 6 years of IceCube data.
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