Dark Matter Search Results from a One Ton-Year Exposure of XENON1T

Dark Matter Search Results from a One Ton-Year Exposure of XENON1T
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DOI:
10.1103/physrevlett.121.111302
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发表时间:
2018-09-12
影响因子:
8.6
通讯作者:
Zhu, T.
Zhu, T.
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Aprile, E.;Aalbers, J.;Zhu, T.

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我们报告的搜索弱相互作用大质量粒子(WIMPs)使用278.8天的数据收集的XENON 1 T实验在LNGS。XENON 1 T使用基准质量为(1.30 +/- 0.01)吨的液体氙时间投影室,导致1.0吨/年的曝光。感兴趣的能量区域,[1.4; 10.6] keV(ee)([4.9; 40.9] keV(nr)),显示出超低的电子反冲背景速率[82(-3)(+5)(系统)+/- 3 stat)]事件/吨yr keV(ee))。没有发现明显超出背景的情况,在空间和能量维度上参数化的轮廓似然分析排除了WIMP质量高于6 GeV/c(2)的WIMP-核子自旋无关弹性散射截面的新参数空间,在30 GeV/c(2)和90%置信水平下最小值为4.1 x 10(-47)cm(2)。
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 x 10(-47) cm(2) at 30 GeV/c(2) and a 90% confidence level.