标题： 在利用PandaX-II实验的完整暴露数据的简化模型中寻找两组分马约拉纳暗物质 显示英文标题

标题： A search for two-component Majorana dark matter in a simplified model using the full exposure data of PandaX-II experiment

摘要： 在两组分马约拉纳暗物质模型中，一个暗物质粒子可以与靶核发生散射，并转化为稍重的组分。 在具有矢量玻色子媒介子的简化模型框架下，树图过程和环图过程都会对直接探测实验中的信号产生贡献。 在本文中，我们报告了来自PandaX-II实验的此类暗物质的搜索结果，使用了全部100.7吨$\cdot$天的暴露数据。 没有观察到显著的过量信号，因此得出了对媒介子质量与暗物质质量组合参数空间的严格限制。 结合来自对撞机实验的补充搜索结果，可以排除大范围的参数空间。 显示英文摘要

摘要： In the two-component Majorana dark matter model, one dark matter particle can scatter off the target nuclei, and turn into a slightly heavier component. In the framework of a simplified model with a vector boson mediator, both the tree-level and loop-level processes contribute to the signal in direct detection experiment. In this paper, we report the search results for such dark matter from PandaX-II experiment, using total data of the full 100.7 tonne$\cdot$day exposure. No significant excess is observed, so strong constraints on the combined parameter space of mediator mass and dark matter mass are derived. With the complementary search results from collider experiments, a large range of parameter space can be excluded.