1. A compact frozen-spin trap for the search for the electric dipole moment of the muon
- Author
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Adelmann, A., Bainbridge, A. R., Bailey, I., Baldini, A., Basnet, S., Berger, N., Calzolaio, C., Caminada, L., Cavoto, G., Cei, F., Chakraborty, R., Barajas, C. Chavez, Chiappini, M., Crivellin, A., Dutsov, C., Ebrahimi, A., Francesconi, M., Galli, L., Gallucci, G., Giovannozzi, M., Goyal, H., Grassi, M., Gurgone, A., Hildebrandt, M., Hoferichter, M., 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., 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., and Zeng, Y.
- Subjects
High Energy Physics - Experiment - Abstract
The electric dipole moments~(EDM) of fundamental particles inherently violate parity~(P) and time-reversal~(T) symmetries. By virtue of the CPT theorem in quantum field theory, the latter also implies the violation of the combined charge-conjugation and parity~(CP) symmetry. 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, \$E \approx 165\$ MV/m, experienced in the rest frame of the muon with a momentum of about 23 MeV/c when it passes through a solenoidal magnetic field of \$|\vec{B}|=2.5\$ T. 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 4E-21 ecm. In a subsequent phase, Phase~II, we propose to improve the sensitivity to 6E-23 ecm using a dedicated instrument installed on a different beamline that produces muons of momentum 125 MeV/c}., Comment: 34 pages, submitted to EPJC
- Published
- 2025