XENON100暗物质结果来自477个活日的组合
XENON100 Dark Matter Results from a Combination of 477 Live Days
摘要：
我们报告了XENON 100实验的WIMP搜索结果，结合了2010年1月至2014年1月的三次运行，总计477天。前两次运行的数据已经公布。在合并结果之前，对2013年4月至2014年1月期间记录的最后一次运行进行盲态分析。实验的超低电磁本底，电子反冲排斥前的~ $5 \times 10^{-3}$事件/（keV $_{\mathrm{ee}}\times$ kg $\times$ day），加上增加48 kg $\times$ yr的暴露，提高了灵敏度。使用能量范围为（6.6 - 43.3）keV $_{\mathrm{nr}}$的轮廓似然分析为大于8 GeV/ $c^2$的WIMP质量的弹性、自旋无关的WIMP-核子散射截面设定了极限，在50 GeV/ $c^2$和90%置信水平下，最小值为1.1 $\times 10^{-45}$ cm $^2$。我们还报告更新的约束的弹性，自旋相关的WIMP核子截面获得相同的数据。我们在WIMP质量为50 GeV/ $c^2$时，在90%置信水平下，将WIMP-中子（质子）截面的上限设定为最小值2.0 $\times 10^{-40}$ cm $^2$（52 $\times 10^{-40}$ cm $^2$）。
英文摘要：
We report on WIMP search results of the XENON100 experiment, combining three runs summing up to 477 live days from January 2010 to January 2014. Data from the first two runs were already published. A blind analysis was applied to the last run recorded between April 2013 and January 2014 prior to combining the results. The ultra-low electromagnetic background of the experiment, ~$5 \times 10^{-3}$ events/(keV$_{\mathrm{ee}}\times$kg$\times$day) before electronic recoil rejection, together with the increased exposure of 48 kg $\times$ yr improves the sensitivity. A profile likelihood analysis using an energy range of (6.6 - 43.3) keV$_{\mathrm{nr}}$ sets a limit on the elastic, spin-independent WIMP-nucleon scattering cross section for WIMP masses above 8 GeV/$c^2$, with a minimum of 1.1 $\times 10^{-45}$ cm$^2$ at 50 GeV/$c^2$ and 90% confidence level. We also report updated constraints on the elastic, spin-dependent WIMP-nucleon cross sections obtained with the same data. We set upper limits on the WIMP-neutron (proton) cross section with a minimum of 2.0 $\times 10^{-40}$ cm$^2$ (52$\times 10^{-40}$ cm$^2$) at a WIMP mass of 50 GeV/$c^2$, at 90% confidence level.
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