SuperCDMS HVeV探测器地下运行与反符合事件选择对轻暗物质的约束
Light Dark Matter Constraints from SuperCDMS HVeV Detectors Operated Underground with an Anticoincidence Event Selection
AI总结：
本研究利用SuperCDMS HVeV探测器地下运行数据，通过反符合事件选择等方法，对暗物质-电子相互作用给出了更严格的约束，显著提升了灵敏度。
摘要：
本文展示了从多个SuperCDMS HVeV探测器在同一外壳中运行的首次地下数据采集活动中获得的暗物质-电子相互作用约束。利用7.63克-天的曝光量，对质量在0.5至1000 MeV/$c^2$之间的暗物质-电子散射截面设置了上限，同时对质量在1.2至23.3 eV/$c^2$之间的暗光子动力学混合和类轴子粒子轴电耦合也设置了上限。与早期的HVeV搜索相比，由于增加了225米水当量的覆盖层、反符合事件选择以及更好的堆积抑制，灵敏度得到了提高。在通过重介质的暗物质-电子散射情况下，截面灵敏度提高了最多25倍。
英文摘要：
This article presents constraints on dark-matter-electron interactions obtained from the first underground data-taking campaign with multiple SuperCDMS HVeV detectors operated in the same housing. An exposure of 7.63 g-days is used to set upper limits on the dark-matter-electron scattering cross section for dark matter masses between 0.5 and 1000 MeV/$c^2$, as well as upper limits on dark photon kinetic mixing and axion-like particle axioelectric coupling for masses between 1.2 and 23.3 eV/$c^2$. Compared to an earlier HVeV search, sensitivity was improved as a result of an increased overburden of 225 meters of water equivalent, an anticoincidence event selection, and better pile-up rejection. In the case of dark-matter-electron scattering via a heavy mediator, an improvement by up to a factor of 25 in cross-section sensitivity was achieved.
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