Adelmann A, Bainbridge A R, Bailey I, Baldini A, Basnet S, Berger N, Bianco L, Calzolaio C, Caminada L, Cavoto G, Cei F, Chakraborty R, Barajas Chavez C, Chiappini M, Chislett R, Crivellin A, Dutsov C, Ebrahimi A, Francesconi M, Galli L, Gallucci G, Giovannozzi M, Goyal H, Grassi M, Gurgone A, Hesketh G, Hildebrandt M, Hoferichter M, Hoh S Y, Höhl D, Hu T, Hume T, Jaeger J A, Juknevicius P, Kästli H C, Keshavarzi A, Khaw K S, Kirch K, Kozlinskiy A, Lancaster M, Leonetti F, Märkisch B, Morvaj L, Papa A, Paraliev M, Pasciuto D, Price J, Renga F, Sakurai M, Sanz-Becerra D, Schmidt-Wellenburg P, Shang Y Z, Takeuchi Y, Tegano M E, Teubner T, Trillaud F, Uglietti D, Vasilkova D, Venturini A, Vitali B, Voena C, Vossebeld J, Wauters F, Wong G M, Zeng Y
ETH Zürich, 8093 Zurich, Switzerland.
PSI Center for Scientific Computing, Theory, and Data, 5232 Villigen PSI, Switzerland.
Eur Phys J C Part Fields. 2025;85(6):622. doi: 10.1140/epjc/s10052-025-14295-7. Epub 2025 Jun 6.
Electric dipole moments (EDM) of fundamental particles inherently violate time-reversal (T) and the combined charge-conjugation and parity symmetry (CP). We aim to measure the EDM of the muon using the frozen-spin technique within a compact storage trap. This method exploits the high effective electric field, , experienced in the rest frame of the muon with a momentum of about when it passes through a solenoidal magnetic field of . In this paper, we outline the fundamental considerations for a muon EDM search and present a conceptual design for a demonstration experiment to be conducted at secondary muon beamlines of the Paul Scherrer Institute in Switzerland. In Phase I, with an anticipated data acquisition period of 200 days, the expected sensitivity to a muon EDM is . In a subsequent phase, Phase II, we propose to improve the sensitivity to using a dedicated instrument installed on a different beamline that produces muons of momentum 125 .
基本粒子的电偶极矩（EDM）本质上违反了时间反演（T）以及电荷共轭与宇称联合对称性（CP）。我们旨在利用紧凑型储存阱中的冻结自旋技术来测量μ子的电偶极矩。该方法利用了μ子在穿过强度为 的螺线管磁场时，在其静止参考系中所经历的高效电场 。μ子动量约为 。在本文中，我们概述了μ子电偶极矩搜寻的基本考量，并给出了在瑞士保罗谢勒研究所的次级μ子束线进行演示实验的概念设计。在第一阶段，预计数据采集期为200天，对μ子电偶极矩的预期灵敏度为 。在随后的第二阶段，我们提议使用安装在不同束线上的专用仪器将灵敏度提高到 ，该束线产生动量为125 的μ子。
