Pacific Northwest National Laboratory (PNNL), Richland, Washington, USA.
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo (UNCUYO), San Carlos de Bariloche 8400, Argentina.
Phys Rev Lett. 2023 Apr 28;130(17):171003. doi: 10.1103/PhysRevLett.130.171003.
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.
我们报告了 DAMIC-M 探测器首次地下运行中电子与亚GeV 暗物质粒子相互作用的限制。该搜索使用 85.23 g 天的积分曝光量，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。在 CCD 像素中搜索电荷量高达 7e^{-}的暗物质引起的电离信号，超过探测器暗电流。使用这个数据集，我们对质量在 0.53 到 1000 MeV/c^{2} 之间的暗物质粒子施加限制，排除了质量范围 [1.6,1000] MeV/c^{2} 和 [1.5,15.1] MeV/c^{2} 中未探索的参数空间，分别用于超轻和重介体相互作用。
