Blumer Philipp, Geissmann Svenja, Vargas Arnaldo J, Janka Gianluca, Ohayon Ben, Crivelli Paolo
Institute for Particle Physics and Astrophysics, Eth Zurich, 8093 Zurich, Switzerland.
Laboratory of Theoretical Physics, Department of Physics, University of Puerto Rico, Río Piedras, 00936 Puerto Rico.
Eur Phys J D At Mol Opt Phys. 2025;79(3):24. doi: 10.1140/epjd/s10053-025-00971-6. Epub 2025 Mar 26.
We review the status of the QED calculations for the muonium energy interval and provide the updated theoretical value of 9874.357(1) . Additionally, we present a model for probing Lorentz-violating coefficients within the Standard Model Extension framework using the fine structure measurement in the presence and absence of a weak external magnetic field, enabling novel tests of CPT and Lorentz symmetry. Using Monte Carlo simulations, we estimate that a precision of on the isolated transition could be achievable employing Ramsey's separate oscillatory fields (SOF) technique. Collecting the required statistics will become feasible with the upcoming High-Intensity Muon Beam (HiMB) at the Paul Scherrer Institute (PSI) in Switzerland. These advancements will enable precise tests of radiative QED corrections and nuclear self-energy contributions, while also providing tests of new physics and sensitivity to unconstrained coefficients for Lorentz violation within the Standard Model Extension framework.
我们回顾了μ子素能量间隔的量子电动力学（QED）计算现状，并给出了9874.357(1)的更新理论值。此外，我们提出了一个模型，用于在标准模型扩展框架内，利用存在和不存在弱外部磁场时的精细结构测量来探测洛伦兹违反系数，从而对CPT和洛伦兹对称性进行新的测试。通过蒙特卡罗模拟，我们估计采用拉姆齐分离振荡场（SOF）技术，在孤立的跃迁上可实现的精度。随着瑞士保罗·谢尔研究所（PSI）即将建成的高强度μ子束（HiMB），收集所需的统计数据将变得可行。这些进展将能够对辐射QED修正和核自能贡献进行精确测试，同时也能对新物理进行测试，并对标准模型扩展框架内未受约束的洛伦兹违反系数具有敏感性。
