Abstract
Abstract In an alternative dark matter scenario, it is assumed that there exist two species of dark matter: a heavy dark matter particle (HDM) with the mass of O(TeV) which is generated in early universe and a lighter dark matter particle (LDM) which is a relativistic product due to the decay of HDM. HDMs, captured by the earth, decay to high energy LDMs, and these particles can be measured by km 3 neutrino telescopes, like the IceCube detector. In the present paper, a Z ′ portal dark matter model is taken for LDMs to interact with nuclei via a neutral current interaction mediated by a heavy gauge boson Z ′ . With the different lifetimes of decay of HDMs and Z ′ masses, the event rates of expected LDMs and neutrinos were evaluated at IceCube in the energy range between 1 TeV and 100 TeV. According to the IceCube data, the upper limit for LDM fluxes was estimated at 90% C.L. at IceCube. With m Z ′ ≲ 250 G e V and τ ϕ ≲ 1 0 20 s, finally, it is proved that LDMs could be directly measured in the energy range between O(1TeV) and O(10TeV) at IceCube.
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