Abstract
The recently observed IceCube PeV events could be due to heavy dark matter (DM) decay. In this paper, we propose a simple DM model with extra U(1)X gauge symmetry and bridge it with standard model particles through heavy right-handed neutrino. The Dirac fermion DM χ with mass ∼5 PeV can dominantly decay into a dark Higgs (ϕ), the SM Higgs (h) and a neutrino (ν). If the lifetime of χ is ∼O(1028) s, the resulting neutrino flux can fit data consistently. The neutrino flux from χ→ϕhν in our model is softer than the one predicted from χ→νh, for example. We also discuss a possible mechanism to produce DM with the right relic abundance.
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