论文标题
在exo-200中搜索来自Dark Matter的MEV电子后坐力
Search for MeV Electron Recoils from Dark Matter in EXO-200
论文作者
论文摘要
我们提出了使用exo-200探测器的费尔米金暗物质吸收来搜索电子回导的特征。我们报告平均电子后坐背景速率为$ 6.8 \ times 10^{ - 4} \,\ Mathrm {cts} \,\ Mathrm {kg}^{ - 1} \ Mathrm {yrm {yr}^ - 1}^{ - 1}^{-1} \ Mathrm {kev}^kev}^= $ 4}与我们的背景预测相比,没有统计学意义的过剩。使用总$ {}^{136} \ Mathrm {Xe} $ $ 234.1 \,\ Mathrm {kg} \,\ Mathrm {yr {yr} $,我们排除了新的参数空间,用于$ M_℃的$ m_ copers $ m_ math,用于$ m_ the $ m_ math,\ m, 11.6 \,\ Mathrm {Mev} $,至少为$ 6 \ times 10^{ - 51} \,\ mathrm {cm}^2 $ at $ 8.3 \,\ m athrm {mev} $,以$ 90 \%$ pustral Level Least。
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron recoil background rate of $6.8 \times 10^{-4}\, \mathrm{cts}\,\mathrm{kg}^{-1}\mathrm{yr}^{-1}\mathrm{keV}^{-1}$ above $4\,\mathrm{MeV}$ and find no statistically significant excess over our background projection. Using a total ${}^{136}\mathrm{Xe}$ exposure of $234.1\,\mathrm{kg}\,\mathrm{yr}$ we exclude new parameter space for the charged-current absorption cross-section for dark matter masses between $m_χ= 2.6\,\mathrm{MeV} - 11.6\,\mathrm{MeV}$ with a minimum of $6\times 10^{-51}\,\mathrm{cm}^2$ at $8.3\,\mathrm{MeV}$ at the $90\%$ confidence level.