标题： 亚GeV暗物质粒子与电子相互作用的DAMIC-M实验限制的第一约束 显示英文标题

标题： First Constraints from DAMIC-M on Sub-GeV Dark-Matter Particles Interacting with Electrons

摘要： 我们报告了DAMIC-M探测器地下运行首次操作对与电子相互作用的亚GeV暗物质粒子的限制。 该搜索使用了85.23克·天的综合曝光量，并利用了DAMIC-M电荷耦合器件（CCD）的亚电子电荷分辨率和低暗电流水平。 在CCD像素中寻找超过探测器暗电流的暗物质引起的电离信号，电荷高达7e$^-$。 通过此数据集，我们对质量在0.53到1000 MeV/$c^2$之间的暗物质粒子设限，排除了参数空间中未被探索的区域，分别为[1.6,1000] MeV/$c^2$和[1.5,15.1] MeV/$c^2$的质量范围内，分别对应于超轻和重介质相互作用的情况。 显示英文摘要

摘要： We report constraints on sub-GeV dark matter particles interacting with electrons from the first underground operation of DAMIC-M detectors. The search is performed with an integrated exposure of 85.23 g days, and exploits the subelectron charge resolution and low level of dark current of DAMIC-M charge-coupled devices (CCDs). Dark-matter-induced ionization signals above the detector dark current are searched for in CCD pixels with charge up to 7e$^-$. With this dataset we place limits on dark matter particles of mass between 0.53 and 1000 MeV/$c^2$, excluding unexplored regions of parameter space in the mass ranges [1.6,1000] MeV/$c^2$ and [1.5,15.1] MeV/$c^2$ for ultralight and heavy mediator interactions, respectively.