Physics Department, Columbia University, New York, New York 10027, USA.
Nikhef and the University of Amsterdam, Science Park, 1098XG Amsterdam, Netherlands.
Phys Rev Lett. 2018 Sep 14;121(11):111302. doi: 10.1103/PhysRevLett.121.111302.
We report on a search for weakly interacting massive particles (WIMPs) using 278.8 days of data collected with the XENON1T experiment at LNGS. XENON1T utilizes a liquid xenon time projection chamber with a fiducial mass of (1.30±0.01) ton, resulting in a 1.0 ton yr exposure. The energy region of interest, [1.4,10.6] keV_{ee} ([4.9,40.9] keV_{nr}), exhibits an ultralow electron recoil background rate of [82_{-3}^{+5}(syst)±3(stat)] events/(ton yr keV_{ee}). No significant excess over background is found, and a profile likelihood analysis parametrized in spatial and energy dimensions excludes new parameter space for the WIMP-nucleon spin-independent elastic scatter cross section for WIMP masses above 6 GeV/c^{2}, with a minimum of 4.1×10^{-47} cm^{2} at 30 GeV/c^{2} and a 90% confidence level.
我们报告了使用 LNGS 的 XENON1T 实验在 278.8 天的数据中搜索弱相互作用大质量粒子（WIMP）的结果。XENON1T 利用具有（1.30±0.01） 吨基准质量的液体氙时间投影室，产生了 1.0 吨 yr 的曝光量。感兴趣的能量区域为 [1.4,10.6] keV_{ee}（[4.9,40.9] keV_{nr}），在超低电子反冲背景率下，[82_{-3}^{+5}(syst)±3(stat)] 事件/（吨 yr keV_{ee}）。未发现明显的背景超量，并且在空间和能量维度上进行参数化的轮廓似然分析排除了 WIMP 质量高于 6 GeV/c^{2}的 WIMP-核子自旋非独立弹性散射截面的新参数空间，在 30 GeV/c^{2}时最小为 4.1×10^{-47} cm^{2}，置信水平为 90%。
