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SLAC National Accelerator Laboratory, Menlo Park, California 94025-7015, USA.
Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, California 94305-4085, USA.
Phys Rev Lett. 2025 Jul 2;135(1):011802. doi: 10.1103/4dyc-z8zf.
We report results of a search for nuclear recoils induced by weakly interacting massive particle (WIMP) dark matter using the LUX-ZEPLIN (LZ) two-phase xenon time projection chamber. This analysis uses a total exposure of 4.2±0.1 tonne-years from 280 live days of LZ operation, of which 3.3±0.1 tonne-years and 220 live days are new. A technique to actively tag background electronic recoils from ^{214}Pb β decays is featured for the first time. Enhanced electron-ion recombination is observed in two-neutrino double electron capture decays of ^{124}Xe, representing a noteworthy new background. After removal of artificial signal-like events injected into the dataset to mitigate analyzer bias, we find no evidence for an excess over expected backgrounds. World-leading constraints are placed on spin-independent (SI) and spin-dependent WIMP-nucleon cross sections for masses ≥9 GeV/c^{2}. The strongest SI exclusion set is 2.2×10^{-48} cm^{2} at the 90% confidence level and the best SI median sensitivity achieved is 5.1×10^{-48} cm^{2}, both for a mass of 40 GeV/c^{2}.
我们报告了使用大型地下氙实验（LZ）双相氙时间投影室寻找由弱相互作用大质量粒子（WIMP）暗物质引起的核反冲的结果。该分析使用了LZ运行280个有效天的4.2±0.1吨·年的总曝光量，其中3.3±0.1吨·年和220个有效天是新的。首次采用了一种主动标记来自²¹⁴Pb β衰变的背景电子反冲的技术。在¹²⁴Xe的双中微子双电子俘获衰变中观察到增强的电子 - 离子复合，这代表了一个值得注意的新背景。在去除注入数据集中以减轻分析器偏差的人工信号类事件后，我们没有发现超过预期背景的证据。对于质量≥9 GeV/c²的情况，对自旋无关（SI）和自旋相关的WIMP - 核子截面给出了世界领先的限制。在90%置信水平下，最强的SI排除值为2.2×10⁻⁴⁸ cm²，对于质量为40 GeV/c²时，实现的最佳SI中位数灵敏度为5.1×10⁻⁴⁸ cm²。
