Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA.
High Energy Physics, Imperial College London, Blackett Laboratory, London SW7 2BZ, United Kingdom.
Phys Rev Lett. 2014 Mar 7;112(9):091303. doi: 10.1103/PhysRevLett.112.091303. Epub 2014 Mar 4.
The Large Underground Xenon (LUX) experiment is a dual-phase xenon time-projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota). The LUX cryostat was filled for the first time in the underground laboratory in February 2013. We report results of the first WIMP search data set, taken during the period from April to August 2013, presenting the analysis of 85.3 live days of data with a fiducial volume of 118 kg. A profile-likelihood analysis technique shows our data to be consistent with the background-only hypothesis, allowing 90% confidence limits to be set on spin-independent WIMP-nucleon elastic scattering with a minimum upper limit on the cross section of 7.6 × 10(-46) cm(2) at a WIMP mass of 33 GeV/c(2). We find that the LUX data are in disagreement with low-mass WIMP signal interpretations of the results from several recent direct detection experiments.
大型地下氙气（LUX）实验是一个双相氙气时间投影室，在南达科他州的桑福德地下研究设施运行。LUX 低温恒温器于 2013 年 2 月在地下实验室首次填充。我们报告了第一次 WIMP 搜索数据集的结果，该数据集是在 2013 年 4 月至 8 月期间采集的，分析了 85.3 个有效天数的数据，有效体积为 118 千克。轮廓似然分析技术表明，我们的数据与仅背景假设一致，允许在 WIMP 质量为 33GeV/c(2)时，对自旋非独立 WIMP-核子弹性散射设置 90%置信限，最小上限为 7.6×10(-46)cm(2)。我们发现，LUX 数据与最近几个直接探测实验的结果的低质量 WIMP 信号解释不一致。
