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Measurement of TeV dark particles due to decay of heavy dark matter in the earth core at IceCube
Physics of the Dark Universe ( IF 5.5 ) Pub Date : 2021-03-30 , DOI: 10.1016/j.dark.2021.100809
Ye Xu

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 km3 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 mZ250GeV and τϕ1020 s, finally, it is proved that LDMs could be directly measured in the energy range between O(1TeV) and O(10TeV) at IceCube.



中文翻译:

由于IceCube地心中的重质暗物质的衰减而导致的TeV暗粒子的测量

在另一种暗物质场景中,假定存在两种暗物质:在早期宇宙中生成的质量为O(TeV)的重暗物质粒子(HDM)和较轻暗物质粒子(LDM)由于HDM的衰减,这是相对论的产物。被地球捕获的HDM会衰减为高能LDM,而这些颗粒的测量单位为km3中微子望远镜,例如IceCube探测器。在本文中,ž 采用门户暗物质模型,使LDM通过重质玻色子介导的中性电流相互作用与核相互作用。 ž。随着HDM和Z衰减的不同寿命在IceCube中,在1 TeV到100 TeV的能量范围内评估了预期的LDM和中微子的发生率。根据IceCube数据,在IceCube处,LDM通量的上限估计为CL的90%。和ž250GË伏特τϕ1个020 最后,证明了可以在IceCube的O(1TeV)和O(10TeV)之间的能量范围内直接测量LDM。

更新日期:2021-04-05
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