Title: Constraints on WIMP-like dark matter scattering on electrons with COSINE-100 Show Chinese title

Title: 与COSINE-100对WIMP样暗物质与电子散射的约束

Abstract: We present results of the search for WIMP-like dark matter interaction with electrons in the NaI(Tl) crystals of the COSINE-100 experiment. The two benchmark scenarios of a heavy and a light vector boson as mediator of the interaction were studied. We found no excess events over the expected background in a data-set of 2.82 years, with a total exposure of 172.9 kg-year. The derived 90% confidence level upper limits exclude a WIMP-electron scattering cross section above 6.4 $\times$ 10$^{-33}$ cm$^2$ for a WIMP mass of 0.25 GeV, assuming a light mediator; and above 3.4 $\times$ 10$^{-37}$ cm$^2$ for a 0.4 GeV WIMP, assuming a heavy mediator, and represent the most stringent constraints for a NaI(Tl) target to date. We also briefly discuss a planned analysis using an annual modulation method below the current 0.7 keV threshold of COSINE-100, down to few photoelectrons yield. Show Chinese abstract

Abstract: 我们展示了在COSINE-100实验的NaI(Tl)晶体中搜索类似WIMP的暗物质与电子相互作用的结果。 研究了作为相互作用媒介的重矢量玻色子和轻矢量玻色子的两个基准情景。 我们在一个2.82年的数据集上未发现超出预期背景的过剩事件，总暴露量为172.9 kg-year。 得出的90%置信度上限排除了假设轻媒介子时0.25 GeV WIMP的WIMP-电子散射截面高于6.4$\times$10$^{-33}$cm$^2$；以及假设重媒介子时0.4 GeV WIMP的WIMP-电子散射截面高于3.4$\times$10$^{-37}$cm$^2$，这些结果是迄今为止对NaI(Tl)靶材最严格的限制。 我们还简要讨论了计划使用年度调制方法的分析，低于当前COSINE-100的0.7 keV阈值，达到少量光电子产率。