加速器缪子束对慢速缪子亲和暗物质的预期灵敏度
Projected Sensitivity to Slow Muonphilic Dark Matter with Accelerator Muon Beams
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中文总结 AI 辅助
本文利用Geant4模拟框架，研究加速器缪子束探测慢速缪子亲和暗物质的灵敏度，发现一天曝光即可比宇宙射线极限提高近两个数量级，展示了束流缪子散射实验的显著优势。
中文摘要 AI 辅助
暗物质（DM）的本质仍然是现代物理学中最持久的开放问题之一，而缪子亲和暗物质已成为一种有前景的候选方案，补充了传统的暗物质候选者。继最近建立的宇宙射线缪子散射方法之后，我们研究了利用加速器缪子束探测慢速缪子亲和暗物质的灵敏度。我们开发了一个基于Geant4的模拟框架，该框架结合了PKMu缪子断层扫描系统的探测器几何结构以及专用的弹性μ-DM散射过程。研究发现，当束流完全包含在探测器接受度内时，预期灵敏度在很大程度上不受束流能量和横向束流尺寸的影响。对于$10^5$/秒的基准束流强度，模拟的纯缪子束在$m_{\ m DM}=1$ GeV时，约11秒内即可超越现有的宇宙射线极限$1.61\ imes10^{-17}$ cm$^2$。我们还基于高流强重离子加速器设施（HIAF）的模拟，实现了真实的缪子束相空间分布，在一天的曝光时间内，预期极限比宇宙射线结果提高了近两个数量级。这些结果表明，束流缪子散射实验为显著提高对慢速缪子亲和暗物质的灵敏度提供了一条稳健且有前景的途径。
英文摘要
The nature of dark matter (DM) remains one of the most enduring open questions in modern physics, and muonphilic DM has emerged as a promising scenario that complements traditional DM candidates. Following the recently established cosmic-ray muon scattering approach, we investigate the sensitivity for probing slow muonphilic DM with accelerator muon beams. A Geant4-based simulation framework is developed, incorporating the detector geometry from the PKMu muon tomography system and a dedicated elastic $μ$-DM scattering process. The projected sensitivity is found to be largely insensitive to both the beam energy and the transverse beam size when the beam is fully contained within the detector acceptance. For a benchmark beam intensity of $10^5/\rm{s}$, the simulated pure-muon beam surpasses the existing cosmic-ray limit of $1.61\times10^{-17}$ cm$^2$ at $m_{\rm DM}=1$ GeV within approximately 11 seconds. A realistic muon beam phase-space distribution based on simulations for the High Intensity heavy-ion Accelerator Facility (HIAF) is also implemented, yielding projected limits that improve upon the cosmic-ray results by nearly two orders of magnitude in a one-day exposure. These results demonstrate that a beam-muon scattering experiment offers a robust and promising route toward significantly improved sensitivity to slow muonphilic DM.
发表机构
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University（北京大学物理学院核物理与技术国家重点实验室）
- Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所）
- University of Chinese Academy of Sciences（中国科学院大学）
- Advanced Energy Science and Technology Guangdong Laboratory（广东省先进能源科学技术实验室）
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences（中国科学院大学核科学与技术学院）
机构由 AI 辅助整理，请以论文原文为准。
