Jefferson实验室束流转储eXperiment（BDX）中的暗物质搜索
Dark matter search in a Beam-Dump eXperiment (BDX) at Jefferson Lab
摘要：
MeV-GeV的暗物质（DM）理论上是很好的动机，但显着未探索。本意向书介绍了MeV-GeV DM发现潜力的1米$^3$分段塑料闪烁体探测器放置在下游的束流转储在一个高强度的JLab实验大厅，接收多达10个$^{22}$电子靶（EOT）在一年的时间。这个实验（Beam-Dump eExperiment或BDX）对DM-核子弹性散射敏感，每年一千次，具有非常低的阈值反冲能量（$\sim$ 1 MeV），并且仅受可还原宇宙成因背景的限制。在要求探测器中的所有电磁簇射超过几百MeV之后，对DM-电子弹性散射和/或非弹性DM的灵敏度将低于每年10个计数，这大大减少或完全消除了所有背景。详细的蒙特卡罗模拟正在进行中，以最终确定探测器的设计和实验装置。现有的0.036米$^3$原型基于相同的技术将被用来验证模拟与背景速率估计，驾驶必要的R $\&$ D朝向优化的检测器。最终的探测器设计和实验设置将在提交给下一届JLab PAC的完整提案中提出。完全实现的实验将对DM参数空间的大区域敏感，在MeV-GeV DM质量范围内，超过现有和计划中实验的发现潜力两个数量级。
英文摘要：
MeV-GeV dark matter (DM) is theoretically well motivated but remarkably unexplored. This Letter of Intent presents the MeV-GeV DM discovery potential for a 1 m$^3$ segmented plastic scintillator detector placed downstream of the beam-dump at one of the high intensity JLab experimental Halls, receiving up to 10$^{22}$ electrons-on-target (EOT) in a one-year period. This experiment (Beam-Dump eXperiment or BDX) is sensitive to DM-nucleon elastic scattering at the level of a thousand counts per year, with very low threshold recoil energies ($\sim$1 MeV), and limited only by reducible cosmogenic backgrounds. Sensitivity to DM-electron elastic scattering and/or inelastic DM would be below 10 counts per year after requiring all electromagnetic showers in the detector to exceed a few-hundred MeV, which dramatically reduces or altogether eliminates all backgrounds. Detailed Monte Carlo simulations are in progress to finalize the detector design and experimental set up. An existing 0.036 m$^3$ prototype based on the same technology will be used to validate simulations with background rate estimates, driving the necessary R$\&$D towards an optimized detector. The final detector design and experimental set up will be presented in a full proposal to be submitted to the next JLab PAC. A fully realized experiment would be sensitive to large regions of DM parameter space, exceeding the discovery potential of existing and planned experiments by two orders of magnitude in the MeV-GeV DM mass range.
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