标题： 重暗物质衰变的中微子通量与冰立方最近事件的协调 显示英文标题

标题： Reconciling neutrino flux from heavy dark matter decay and recent events at IceCube

摘要： 冰立方探测器最近报告了在以前未探索的能量下的28个事件。 尽管观察到的事件统计量仍然较低，但这些事件暗示存在超出大气中微子背景的中微子通量。 我们研究了额外中微子通量的一个显著成分可能由于非常重的暗物质（VHDM）粒子通过几种可能的通道衰变为标准模型粒子而产生。 我们表明，将幂律天体物理中微子谱与质量在$150-400$ TeV 范围内的暗物质粒子衰变产生的中微子通量相结合，比仅使用最佳拟合的天体物理中微子通量得到的拟合效果更好。 假设存在由 IC 最佳拟合描述的天体物理背景，我们还表明，对于更重的暗物质粒子（$m_{\text{DM}} \sim 1$ PeV）的衰变，相同的观测结果对衰变寿命施加了重要的限制。 允许天体物理中微子通量归一化变化会导致这些限制的变化，然而，仍有一部分暗物质质量和寿命被 IC 结果排除。 显示英文摘要

摘要： The IceCube detector has recently reported the observation of 28 events at previously unexplored energies. While the statistics of the observed events are still low, these events hint at the existence of a neutrino flux over and above the atmospheric neutrino background. We investigate the possibility that a significant component of the additional neutrino flux originates due to the decay of a very heavy dark matter (VHDM) particle via several possible channels into standard model particles. We show that a combination of a power law astrophysical neutrino spectrum and the neutrino flux from the decay of a DM species of mass in the range $150-400$ TeV improves the fit to the observed neutrino events than that obtained from a best-fit astrophysical flux alone. Assuming the existence of an astrophysical background described by the IC best-fit, we also show that, for the decay of even heavier DM particles ($m_{\text{DM}} \sim 1$ PeV), the same observations impose significant constraints on the decay lifetimes. Allowing the astrophysical flux normalization to vary leads to modifications of these limits, however, there is still a range of dark matter mass and lifetime that is excluded by the IC results.