First Leptophobic Dark Matter Search from the Coherent–CAPTAIN-Mills Liquid Argon Detector
First Leptophobic Dark Matter Search from the Coherent–CAPTAIN-Mills Liquid Argon Detector
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相干公司 CAPTAIN-Mills 液氩探测器首次进行疏疏暗物质搜索
DOI：
10.1103/physrevlett.129.021801
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发表时间：
2022
影响因子：
8.6
通讯作者：
Diaz, A.
中科院分区：
文献类型：
--
作者：
Aguilar-Arevalo, A. A.;Alves, D. S. M.;Biedron, S.;Boissevain, J.;Borrego, M.;Chavez-Estrada, M.;Chavez, A.;Conrad, J. M.;Cooper, R. L.;Diaz, A.
我们报告了从Coherent-CAPTAIN-Mills （CCM）液态氩（LAr）探测器中寻找轻疏暗物质（DM）的第一个结果。为了研究CCM探测器的特性，在2019年秋季进行了120个光电倍增管（pmt）和靶上质子（POT）的工程运行。这台重达10吨的探测器的运行严格以光为基础，阈值为50 keV，并使用氩核的相干弹性散射来检测DM。尽管只有1.5个月的累积亮度，受污染的LAr和未优化的屏蔽，CCM的第一次工程运行已经实现了对以前未探索的具有重子矢量门户的光暗物质模型参数空间的灵敏度。在115005个事件的预期背景下，我们观察到的事件与背景预期相符。对于基准介质与DM质量比，DM质量在90% c.l范围内被排除。在应用Feldman-Cousins检验统计量后的瘦症模型中。CCM升级后的200 pmt、过滤后的LAr、改进的屏蔽和10倍的POT将能够排除该模型剩余的热遗迹密度参数空间，并探测其他疏光DM模型的新参数空间。
We report the first results of a search for leptophobic dark matter (DM) from the Coherent–CAPTAIN-Mills (CCM) liquid argon (LAr) detector. An engineering run with 120 photomultiplier tubes (PMTs) andprotons on target (POT) was performed in fall 2019 to study the characteristics of the CCM detector. The operation of this 10-ton detector was strictly light based with a threshold of 50 keV and used coherent elastic scattering off argon nuclei to detect DM. Despite only 1.5 months of accumulated luminosity, contaminated LAr, and nonoptimized shielding, CCM’s first engineering run has already achieved sensitivity to previously unexplored parameter space of light dark matter models with a baryonic vector portal. With an expected background of 115 005 events, we observeevents which is compatible with background expectations. For a benchmark mediator-to-DM mass ratio of, DM masses within the rangeare excluded at 90% C. L. in the leptophobic model after applying the Feldman-Cousins test statistic. CCM’s upgraded run with 200 PMTs, filtered LAr, improved shielding, and 10 times more POT will be able to exclude the remaining thermal relic density parameter space of this model, as well as probe new parameter space of other leptophobic DM models.