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    • Effective Field Theory Analysis of CDMSlite Run 2 Data

    arXiv · Cosmology and Nongalactic Astrophysics（2022）

    Cited 1|Views93
    Abstract
    CDMSlite Run 2 was a search for weakly interacting massive particles (WIMPs) with a cryogenic 600 g Ge detector operated in a high-voltage mode to optimize sensitivity to WIMPs of relatively low mass from 2 - 20 GeV/$c^2$. In this article, we present an effective field theory (EFT) analysis of the CDMSlite Run 2 data using an extended energy range and a comprehensive treatment of the expected background. A binned likelihood Bayesian analysis was performed on the recoil energy data, taking into account the parameters of the EFT interactions and optimizing the data selection with respect to the dominant background components. Energy regions within 5$\sigma$ of known activation peaks were removed from the analysis. The Bayesian evidences resulting from the different operator hypotheses show that the CDMSlite Run 2 data are consistent with the background-only models and do not allow for a signal interpretation assuming any additional EFT interaction. Consequently, upper limits on the WIMP mass and coupling-coefficient amplitudes and phases are presented for each EFT operator. These limits improve previous CDMSlite Run 2 bounds for WIMP masses above 5 GeV/$c^2$.
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    Detector Performance,Direct Detection
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    【要点】：本论文通过有效场理论（EFT）分析CDMSlite Run 2数据，未发现弱相互作用大质量粒子（WIMP）的信号，提出了新的WIMP质量与耦合系数的上限。
    

    【方法】：采用了一种扩展的能量范围和全面处理预期背景的有效场理论（EFT）分析方法，运用分块似然贝叶斯分析对回弹能量数据进行处理，考虑EFT相互作用参数，并针对主要背景成分优化数据选择。
    

    【实验】：实验使用了一个运行在高压模式下的600克锗探测器，搜索了相对质量在2至20 GeV/$c^2$范围内的WIMP。通过不同操作假设的贝叶斯证据表明，CDMSlite Run 2数据与仅含背景的模型一致，不支持任何额外EFT相互作用的信号解释。删除了已知激活峰附近5$\sigma$能量区域的数据后，对每个EFT操作符提出了WIMP质量及耦合系数振幅和相位的上限，这些限制对于5 GeV/$c^2$以上的WIMP质量优于CDMSlite Run 2之前的界限。
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