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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. 2023 Jul 28;131(4):041002. doi: 10.1103/PhysRevLett.131.041002.
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/c^{2}. The most stringent limit is set for spin-independent scattering at 36 GeV/c^{2}, rejecting cross sections above 9.2×10^{-48} cm at the 90% confidence level.
LUX-ZEPLIN实验是一个暗物质探测器，其核心是一个双相氙时间投影室，在美国南达科他州利德市的桑福德地下研究设施运行。本信函报告了LUX-ZEPLIN首次搜寻弱相互作用大质量粒子（WIMP）的结果，使用5.5吨的基准质量，曝光60个活天。轮廓似然比分析表明，数据与仅含背景的假设一致，为质量高于9 GeV/c²的WIMP设定了自旋无关WIMP-核子、自旋相关WIMP-中子和自旋相关WIMP-质子截面的新限制。在36 GeV/c²时，对自旋无关散射设定了最严格的限制，在90%置信水平下排除了高于9.2×10⁻⁴⁸ cm²的截面。
