论文标题
通过BDX-MINI实验搜索暗物质
Dark matter search with the BDX-MINI experiment
论文作者
论文摘要
BDX-MINI是一项优化的梁转储实验，以搜索在杰斐逊实验室（Jefferson Lab）的强烈CEBAF 2.176 GEV电子束与霍尔A梁转储的相互作用中产生的轻暗物质。 BDX-MINI探测器由PBWO $ _4 $ _4 $电磁热量计组成，该热量计周围环绕着用于背景拒绝的密封否决系统。该实验在六个月内积累了$ 2.56 \ times 10^{21} $ eot。使用BDX-MINI检测器的活动体积的电子与电子相互作用的模拟和标量暗物质相互作用来估计预期信号。在横梁停机期间收集的数据使我们能够表征由宇宙射线主导的背景。基于最大似然方法的盲数据分析用于优化实验灵敏度。使用在梁孔和横梁构造过程中收集的合并事件样品设置了对光暗物质的上限。在某些运动学中，该试验实验对迄今为止一些最敏感的实验所涵盖的参数空间敏感，这证明了在强烈电子束设备计划下的下一代梁转储实验的发现潜力。
BDX-MINI is a beam dump experiment optimized to search for Light Dark Matter produced in the interaction of the intense CEBAF 2.176 GeV electron beam with the Hall A beam dump at Jefferson Lab. The BDX-MINI detector consists of a PbWO$_4$ electromagnetic calorimeter surrounded by a hermetic veto system for background rejection. The experiment accumulated $2.56 \times 10^{21}$ EOT in six months of running. Simulations of fermionic and scalar Dark Matter interactions with electrons of the active volume of the BDX-MINI detector were used to estimate the expected signal. Data collected during the beam-off time allowed us to characterize the background dominated by cosmic rays. A blind data analysis based on a maximum-likelihood approach was used to optimize the experiment sensitivity. An upper limit on the production of light dark matter was set using the combined event samples collected during beam-on and beam-off configurations. In some kinematics, this pilot experiment is sensitive to the parameter space covered by some of the most sensitive experiments to date, which demonstrates the discovery potential of the next generation beam dump experiment planned at intense electron beam facilities.
