核壳模型不确定性对硅和锗WIMP-核子极限的影响
Impact of nuclear shell model uncertainties on silicon and germanium WIMP-nucleus limits
- University of Toronto（多伦多大学）
- Australian National University（澳大利亚国立大学）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本文研究硅和锗靶核壳模型不确定性对WIMP-核子直接探测排除极限的影响，发现核结构不确定性不可忽略，需在实验分析中加以考虑。
中文摘要 AI 辅助
暗物质（DM）直接探测实验旨在寻找弱相互作用大质量粒子（WIMPs）与原子核散射所产生的核反冲。计算这一WIMP-核子弹性散射过程的速率涉及多个组成部分的输入，包括直接探测实验响应函数、所采用的高能物理内容、暗物质晕速度分布以及靶核结构信息。这些组成部分中的任何不确定性都可能影响对实验信号的解读，并影响对速率预测的分析。在本工作中，我们聚焦于硅和锗靶核结构建模所引入的不确定性，通过非相对论有效场论（NREFT）框架采用了一套全面的核形状因子。我们表明，这些由大规模壳模型计算获得的不确定性会影响核形状因子，从而影响类似SuperCDMS实验的排除极限。我们还探讨了高能物理内容（通过粒子物理系数）对核不确定性大小的影响，针对几种WIMP-核子散射响应进行了研究。对于多个直接探测核响应，存在不可忽略的核不确定性，这表明在实验分析和解读中必须考虑核结构因素。
英文摘要
Dark matter (DM) direct detection searches look for nuclear recoils as a result of weakly interacting massive particles (WIMPs) scattering off nuclei. Calculating the rate associated with this WIMP-nucleus elastic scattering process involves input from several components, which include the direct detection experimental response functions, the high energy physics content employed, the DM halo velocity distribution, and the target nuclear structure information. Uncertainties in any of these components can impact the interpretation of experimental signals, and affect analysis of rate predictions. In this work, we focus on the uncertainties present due to the nuclear structure modelling of silicon and germanium targets, where a comprehensive set of nuclear form factors are employed through a non-relativistic effective field theory (NREFT) formalism. We show that these uncertainties, obtained from large-scale shell model calculations, impact the nuclear form factors and thus experimental exclusion limits for a SuperCDMS-like experiment. The impact of high energy physics content (through particle physics coefficients) on the magnitude of the nuclear uncertainties is also explored for several WIMP-nucleus scattering responses. Non-negligible nuclear uncertainties are present for several direct detection nuclear responses, indicating that nuclear structure must be accounted for in experimental analysis and interpretation.
