Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan.
Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
Phys Rev Lett. 2023 Jan 20;130(3):031802. doi: 10.1103/PhysRevLett.130.031802.
We report a search for cosmic-ray boosted dark matter with protons using the 0.37 megaton×years data collected at Super-Kamiokande experiment during the 1996-2018 period (SKI-IV phase). We searched for an excess of proton recoils above the atmospheric neutrino background from the vicinity of the Galactic Center. No such excess is observed, and limits are calculated for two reference models of dark matter with either a constant interaction cross section or through a scalar mediator. This is the first experimental search for boosted dark matter with hadrons using directional information. The results present the most stringent limits on cosmic-ray boosted dark matter and exclude the dark matter-nucleon elastic scattering cross section between 10^{-33}cm^{2} and 10^{-27}cm^{2} for dark matter mass from 1 MeV/c^{2} to 300 MeV/c^{2}.
我们报告了使用 Super-Kamiokande 实验在 1996 年至 2018 年期间（SKI-IV 阶段）收集的 0.37 兆吨×年数据，对宇宙射线增强暗物质与质子的搜索。我们在银河系中心附近寻找来自大气中微子背景的质子反冲过量。没有观察到这种过剩，并且针对暗物质的两个参考模型计算了限制，这两个模型要么具有恒定的相互作用截面，要么通过标量介体。这是首次使用方向信息对增强暗物质与强子进行的实验搜索。该结果对宇宙射线增强暗物质提出了最严格的限制，并排除了暗物质-核子弹性散射截面在 10^{-33}cm^{2}到 10^{-27}cm^{2}之间，暗物质质量在 1 MeV/c^{2}到 300 MeV/c^{2}之间。
