IceCube Events from Heavy DM decays through the Right-handed Neutrino Portal
arXiv:1508.02500 · doi:10.1016/j.physletb.2015.10.021
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 $Ï$ with mass ~5 PeV can dominantly decay into a dark Higgs ($Ï$), the SM Higgs ($h$) and a neutrino ($ν$). If the lifetime of $Ï$ is ~O($10^{28}$) sec, the resulting neutrino flux can fit data consistently. The neutrino flux from $Ï\rightarrow Ïh ν$ in our model is softer than the one predicted from $Ï\rightarrow νh$, for example. We also discuss a possible mechanism to produce DM with the right relic abundance.
17 pages, 5 figures, references added, minor changes, published version