arXiv 2005.019502020-05hep-phastro-ph.COhep-ex

利用Hyper-Kamiokande探测银河系中心的Sub-GeV暗物质

Searching for Sub-GeV Dark Matter in the Galactic Centre using Hyper-Kamiokande

Nicole F. Bell, Matthew J. Dolan, Sandra Robles

备注：: 30 pages, 17 figures, 4 tables, 2 appendices. Discussion extended, references added, matches JCAP published version
发表信息：: JCAP 09 (2020) 019
DOI：: 10.1088/1475-7516/2020/09/019

摘要：

通过湮灭产物间接探测暗物质是寻找大质量弱相互作用粒子（WIMPs）形式的暗物质的关键技术。强约束存在于湮灭的WIMP高度可见的标准模型的最终状态，如光子或带电粒子。在s波湮灭的情况下，这通常会消除质量低于$\cal{O}$（10）GeV的暗物质的热遗迹截面。然而，这样的限制通常忽略了暗物质可能湮灭到假设的不可见或难以检测的最终状态（如中微子）的可能性。由于中微子相互作用的截面很弱，这是一个很难探测的范例。考虑到星系晕中的暗物质湮灭，我们研究了使用Hyper-Kamiokande（HyperK）中微子实验间接探测质量低于1 GeV的暗物质的前景。我们对HyperK探测器进行了专门的模拟，并将其与类似的Super-Kamiokande实验和HyperK物理投影的结果进行了比较。我们提供的湮灭截面，可以探测到的HyperK湮灭μ子或中微子的最终状态的预测，并讨论与暗物质晕配置文件的不确定性。对于中微子的最终状态，我们发现，HyperK是敏感的热湮灭截面与质量约20 MeV的暗物质，假设NFW晕配置文件。我们还讨论了中子标记的影响，并在低质量的范围内提高的前景。

英文摘要：

Indirect detection of dark matter via its annihilation products is a key technique in the search for dark matter in the form of weakly interacting massive particles (WIMPs). Strong constraints exist on the annihilation of WIMPs to highly visible Standard Model final states such as photons or charged particles. In the case of s-wave annihilation, this typically eliminates thermal relic cross sections for dark matter of mass below $\cal{O}$(10) GeV. However, such limits typically neglect the possibility that dark matter may annihilate to assumed invisible or hard-to-detect final states, such as neutrinos. This is a difficult paradigm to probe due to the weak neutrino interaction cross section. Considering dark matter annihilation in the Galactic halo, we study the prospects for indirect detection using the Hyper-Kamiokande (HyperK) neutrino experiment, for dark matter of mass below 1 GeV. We undertake a dedicated simulation of the HyperK detector, which we benchmark against results from the similar Super-Kamiokande experiment and HyperK physics projections. We provide projections for the annihilation cross-sections that can be probed by HyperK for annihilation to muon or neutrino final states, and discuss uncertainties associated with the dark matter halo profile. For neutrino final states, we find that HyperK is sensitive to thermal annihilation cross-sections for dark matter with mass around 20 MeV, assuming an NFW halo profile. We also discuss the effects of neutron tagging, and prospects for improving the reach at low mass.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文