First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment
First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment
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DOI：
10.1103/physrevlett.131.041002
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发表时间：
2023-07-28
影响因子：
8.6
通讯作者：
Zuckerman, A.
中科院分区：
文献类型：
--
作者：
Aalbers, J.;Akerib, D. S.;Zuckerman, A.
LUX-ZEPLIN实验是一个暗物质探测器，位于美国南达科他州的桑福德地下研究设施，中心位于一个双相氙时间投影室。这封信报告了LUX-ZEPLIN首次搜索弱相互作用大质量粒子（WIMP）的结果，使用5.5 t的基准质量进行了60天的曝光。一个配置文件的似然比分析表明，数据是一致的背景假设，设置新的限制自旋独立的WIMP核子，自旋相关的WIMP中子，自旋相关的WIMP质子横截面的WIMP质量超过9 GeV/c2。最严格的限制是在36 GeV/c2的自旋无关散射，拒绝在90%的置信水平超过9.2 × 10-48厘米2的截面。
The LUX-ZEPLIN experiment is a dark matter detector centered on a dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility in Lead, South Dakota, USA. This Letter reports results from LUX-ZEPLIN's first search for weakly interacting massive particles (WIMPs) with an exposure of 60 live days using a fiducial mass of 5.5 t. A profile-likelihood ratio analysis shows the data to be consistent with a background-only hypothesis, setting new limits on spin-independent WIMP-nucleon, spin-dependent WIMP-neutron, and spin-dependent WIMP-proton cross sections for WIMP masses above 9 GeV/c2. The most stringent limit is set for spin-independent scattering at 36 GeV/c2, rejecting cross sections above 9.2 x 10-48 cm2 at the 90% confidence level.