发表机构
Shanghai Jiao Tong University; SJTU Paris Elite Institute of Technology, Shanghai Jiao Tong University; Shanghai Jiao Tong University Sichuan Research Institute（上海交通大学; 上海交大巴黎卓越工程师学院; 上海交通大学四川研究院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出通过太阳核聚变产生的光子产生MeV电亲轴子粒子，并探讨其在暗物质探测中的应用。
AI 中文摘要
本文探讨了利用太阳核聚变过程中产生的单色5.5MeV光子产生MeV尺度的电亲轴子粒子（ALPs）的可能性。这些5.5MeV光子可以通过与太阳物质中的自由电子发生类似康普顿散射的过程，产生大量MeV的ALPs。当这些ALPs到达地球时，可以通过相同的电子耦合进行探测，为暗物质直接探测实验提供新的机会，以探测此前未探索的参数区域。我们显示，现有的LZ、PandaX-4T和Borexino数据可以达到灵敏度$g_{ae} \lesssim 3.7 \times 10^{-6}$，$g_{ae} \lesssim 3.7 \times 10^{-6}$和$g_{ae} \lesssim 1.7 \times 10^{-6}$，分别对应$m_a \lesssim 1$MeV。乐观的PandaX-xT实验200吨·年暴露量可以达到$g_{ae}\lesssim 1.6 \times 10^{-6}$，对于大部分质量窗口$m_a < 1$MeV，甚至在$m_a$接近1MeV时可以达到$g_{ae} \lesssim 1.5 \times 10^{-7}$。尽管来自不同实验室实验和天体物理观测的严格限制，我们从LZ、PandaX-4T和Borexino获得的限制可以探测新的参数区域，特别是在质量窗口$0.4\,{\rm MeV} \lesssim m_a \lesssim 1$MeV。
英文摘要
This work explores the production of an MeV-scale electrophilic axion-like particles (ALPs) by utilizing the monochromatic 5.5MeV photon resulting from the nuclear fusion processes in the Sun. These 5.5MeV photons can undergo the Compton-like scattering with the ambient electrons in the solar matter to produce a substantial flux of MeV ALPs. Upon reaching the Earth, such ALPs can be detected via the same electron coupling, offering a new opportunity for the dark matter (DM) direct detection experiments to probe the previously unexplored parameter regions. We show that the existing data of LZ, PandaX-4T, and Borexino can attain the sensitivities $g_{ae} \lesssim 3.7 \times 10^{-6}$, $g_{ae} \lesssim 3.7 \times 10^{-6}$ and $g_{ae} \lesssim 1.7 \times 10^{-6}$, respectively, for $m_a \lesssim 1$MeV. An optimistic 200 tonne$\times$year exposure by PandaX-xT can reach $g_{ae}\lesssim 1.6 \times 10^{-6}$ for most of the mass window $m_a < 1$MeV and even $g_{ae} \lesssim 1.5 \times 10^{-7}$ with $m_a$ approaching 1MeV. Despite the stringent constraints from different laboratory experiments and astrophysical observations, our obtained limits from LZ, PandaX-4T, and Borexino can probe new parameter regions, specifically in the mass window $0.4\,{\rm MeV} \lesssim m_a \lesssim 1$MeV.
Comments26 pages, 7 figures; v2: supernova cooling limit updated, new references added
