Latacz B M, Arndt B P, Bauer B B, Devlin J A, Erlewein S R, Fleck M, Jäger J I, Schiffelholz M, Umbrazunas G, Wursten E J, Abbass F, Micke P, Popper D, Wiesinger M, Will C, Yildiz H, Blaum K, Matsuda Y, Mooser A, Ospelkaus C, Quint W, Soter A, Walz J, Yamazaki Y, Smorra C, Ulmer S
RIKEN, Ulmer Fundamental Symmetries Laboratory, 2-1 Hirosawa, Wako, Saitama, 351-0198 Japan.
CERN, Esplanade des Particules 1, 1217 Meyrin, Switzerland.
Eur Phys J D At Mol Opt Phys. 2023;77(6):94. doi: 10.1140/epjd/s10053-023-00672-y. Epub 2023 Jun 5.
The BASE collaboration at the antiproton decelerator/ELENA facility of CERN compares the fundamental properties of protons and antiprotons with ultra-high precision. Using advanced Penning trap systems, we have measured the proton and antiproton magnetic moments with fractional uncertainties of 300 parts in a trillion (p.p.t.) and 1.5 parts in a billion (p.p.b.), respectively. The combined measurements improve the resolution of the previous best test in that sector by more than a factor of 3000. Very recently, we have compared the antiproton/proton charge-to-mass ratios with a fractional precision of 16 p.p.t., which improved the previous best measurement by a factor of 4.3. These results allowed us also to perform a differential matter/antimatter clock comparison test to limits better than %. Our measurements enable us to set limits on 22 coefficients of CPT- and Lorentz-violating standard model extensions (SME) and to search for potentially asymmetric interactions between antimatter and dark matter. In this article, we review some of the recent achievements and outline recent progress towards a planned improved measurement of the antiproton magnetic moment with an at least tenfold improved fractional accuracy.
欧洲核子研究组织（CERN）反质子减速器/ELENA装置的BASE合作项目以超高精度比较质子和反质子的基本特性。利用先进的潘宁阱系统，我们分别测量了质子和反质子的磁矩，其分数不确定度分别为万亿分之300（ppt）和十亿分之1.5（ppb）。综合测量将该领域先前最佳测试的分辨率提高了3000倍以上。最近，我们比较了反质子/质子的荷质比，分数精度达到16 ppt，将先前的最佳测量结果提高了4.3倍。这些结果还使我们能够进行物质/反物质时钟的差分比较测试，达到优于%的极限。我们的测量使我们能够对违反CPT和洛伦兹对称性的标准模型扩展（SME）的22个系数设定限制，并寻找反物质与暗物质之间潜在的不对称相互作用。在本文中，我们回顾了一些近期的成果，并概述了在计划中对反质子磁矩进行改进测量方面取得的最新进展，其分数精度至少提高了十倍。
