论文标题
在Pandax-4T实验中搜索带有电离信号的轻度暗物质
Search for light dark matter with ionization signals in the PandaX-4T Experiment
论文作者
论文摘要
我们使用PANDAX-4T液体氙气检测器的调试数据，通过与壳电子和核的相互作用来报告光暗物质的搜索结果。选择低能事件的仅电离信号在60至200个光电子之间，对应于0.77至2.54 KEV的平均核后坐力能量，并且电子后坐力能量从0.07到0.23 KEV。有效暴露于0.55吨$ \ cdot $年，我们将最严格的限制设置在40 $ \ rm {mev/c^2} $到10 $ \ rm {gev/c^2} $的点{gev/c^2} $中，以点为点状的暗物质 - 互动，100 mev/c $^2 $^2 $^2 $^2 $^2 $ 2 $^2 $ 3. 4 $ \ rm {gev/c^2} $用于暗物质 - 核旋转无关的交互。对于与电子的相互作用，我们的限制正在关闭，该参数空间由早期宇宙中的冻结和冻结机制预测。
We report the search results of light dark matter through its interactions with shell electrons and nuclei, using the commissioning data from the PandaX-4T liquid xenon detector. Low energy events are selected to have an ionization-only signal between 60 to 200 photoelectrons, corresponding to a mean nuclear recoil energy from 0.77 to 2.54 keV and electronic recoil energy from 0.07 to 0.23 keV. With an effective exposure of 0.55 tonne$\cdot$year, we set the most stringent limits within a mass range from 40 $\rm{MeV/c^2}$ to 10 $\rm{GeV/c^2}$ for point-like dark matter-electron interaction, 100 MeV/c$^2$ to 10 GeV/c$^2$ for dark matter-electron interaction via a light mediator, and 3.2 to 4 $\rm{GeV/c^2}$ for dark matter-nucleon spin-independent interaction. For DM interaction with electrons, our limits are closing in on the parameter space predicted by the freeze-in and freeze-out mechanisms in the early Universe.
