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来自DEAP-3600的最新结果

Recent results from DEAP-3600

Michela Lai

摘要:

DEAP-3600是目前运行中最大的充满液态氩的暗物质探测器,位于加拿大萨德伯里的SNOLAB地下2公里处。该实验在氩气中对大于20 GeV/c $^2$的WIMP具有最严格的排斥极限。在最新发表的分析中,由于探测器颈部的α诱导闪烁导致的背景事件限制了灵敏度。由于硬件升级和应用多变量分析实现了背景的减少,探测器在下一次WIMP搜索中的灵敏度将得到提高。此外,在非相对论性有效场论框架下重新审视了WIMP分析,并探讨了银河系暗物质晕中可能的子结构的影响。这项分析是由盖亚和斯隆天空数字调查的最新结果推动的。在这里,DEAP-3600为恐氙暗物质设定了世界上最好的排除极限。最后,一项定制开发的分析最近指出了对超重、多散射暗物质候选者的非凡敏感性,导致对两种复合暗物质候选者的世界领先的排除限制达到普朗克尺度质量。这些会议记录在对DEAP-3600中的暗物质探测进行快速概述之后,概述了探测器升级和过去三年合作的暗物质搜索结果。

英文摘要:

DEAP-3600 is the largest running dark matter detector filled with liquid argon, set at SNOLAB, in Sudbury, Canada, 2 km underground. The experiment holds the most stringent exclusion limit in argon for WIMPs above 20 GeV/c$^2$. In the most recent published analysis, the background events due to alpha-induced scintillation in the neck of the detector limited the sensitivity. The sensitivity of the detector in the next WIMP search will be improved thanks to the decrease in backgrounds achieved by hardware upgrades and applying multivariate analyses. Moreover, the WIMP analysis has been revisited in terms of a non-relativistic effective field theory framework, and the impact of possible substructures in the galactic dark matter halo was explored. This analysis was motivated by the latest results from Gaia and the Sloan Sky Digital Survey. Here DEAP-3600 set the world's best exclusion limit for xenon-phobic dark matter scenarios. Finally, a custom-developed analysis has recently pointed out the extraordinary sensitivity to ultra-heavy, multi-scattering dark matter candidates, resulting in world-leading exclusion limits on two composite dark matter candidates up to Planck scale masses. These proceedings, after a quick overview of the dark matter detection in DEAP-3600, outline the detector upgrades and the dark matter search results from the collaboration of the last three years.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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