Searching for Sub-GeV dark matter in the galactic centre using Hyper-Kamiokande
Searching for Sub-GeV dark matter in the galactic centre using Hyper-Kamiokande
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DOI：
10.1088/1475-7516/2020/09/019
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发表时间：
2020-05
影响因子：
6.4
通讯作者：
N. Bell;M. Dolan;S. Robles
中科院分区：
文献类型：
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作者：
N. Bell;M. Dolan;S. Robles
通过其湮没产物间接检测暗物质是寻找弱相互作用大质量粒子（WIMPs）形式的暗物质的关键技术。强有力的限制存在于湮灭的WIMP高度可见的标准模型最终状态，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10 GeV的暗物质的热遗迹截面。𝒪然而，这样的限制通常忽略了暗物质可能湮灭为假设的不可见或难以检测的最终状态的可能性，例如中微子。由于中微子相互作用截面很弱，这是一个很难探测的范例。考虑到暗物质湮灭在银河系晕，我们研究的前景，间接检测使用超神冈（HyperK）中微子实验，暗物质的质量低于1 GeV。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的质量约为20兆电子伏的暗物质，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。
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 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.