학술논문
Search for a muon EDM using the frozen-spin technique
Document Type
Working Paper
Author
Adelmann, A.; Backhaus, M.; Barajas, C. Chavez; Berger, N.; Bowcock, T.; Calzolaio, C.; Cavoto, G.; Chislett, R.; Crivellin, A.; Daum, M.; Fertl, M.; Giovannozzi, M.; Hesketh, G.; Hildebrandt, M.; Keshelashvili, I.; Keshavarzi, A.; Khaw, K. S.; Kirch, K.; Kozlinskiy, A.; Knecht, A.; Lancaster, M.; Märkisch, B.; Aeschbacher, F. Meier; Méot, F.; Nass, A.; Papa, A.; Pretz, J.; Price, J.; Rathmann, F.; Renga, F.; Sakurai, M.; Schmidt-Wellenburg, P.; Schöning, A.; Schott, M.; Voena, C.; Vossebeld, J.; Wauters, F.; Winter, P.
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Subject
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Abstract
This letter of intent proposes an experiment to search for an electric dipole moment of the muon based on the frozen-spin technique. We intend to exploit the high electric field, $E=1{\rm GV/m}$, experienced in the rest frame of the muon with a momentum of $p=125 {\rm MeV/}c$ when passing through a large magnetic field of $|\vec{B}|=3{\rm T}$. Current muon fluxes at the $\mu$E1 beam line permit an improved search with a sensitivity of $\sigma(d_\mu)\leq 6\times10^{-23}e{\rm cm}$, about three orders of magnitude more sensitivity than for the current upper limit of $|d_\mu|\leq1.8\times10^{-19}e{\rm cm}$\,(C.L. 95\%). With the advent of the new high intensity muon beam, HIMB, and the cold muon source, muCool, at PSI the sensitivity of the search could be further improved by tailoring a re-acceleration scheme to match the experiments injection phase space. While a null result would set a significantly improved upper limit on an otherwise un-constrained Wilson coefficient, the discovery of a muon EDM would corroborate the existence of physics beyond the Standard Model.
Comment: Based on the letter of intent submitted to the PSI CHRISP research committee in January 021 28 pages, 25 figures
Comment: Based on the letter of intent submitted to the PSI CHRISP research committee in January 021 28 pages, 25 figures