Search for a muon EDM using the frozen-spin technique

A. Adelmann, M. Backhaus, C. Chavez Barajas, N. Berger, T. Bowcock, C. Calzolaio, G. Cavoto, R. Chislett, A. Crivellin, M. Daum, M. Fertl, M. Giovannozzi, G. Hesketh, M. Hildebrandt, I. Keshelashvili, A. Keshavarzi, K. S. Khaw, K. Kirch, A. Kozlinskiy, A. KnechtM. Lancaster, B. Märkisch, F. Meier Aeschbacher, F. Méot, A. Nass, A. Papa, J. Pretz, J. Price, F. Rathmann, F. Renga, M. Sakurai, P. Schmidt-Wellenburg, A. Schöning, M. Schott, C. Voena, J. Vossebeld, F. Wauters, P. Winter

Research output: Working paperPreprint

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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=1GV/m, experienced in the rest frame of the muon with a momentum of p=125MeV/c when passing through a large magnetic field of |B|=3T. Current muon fluxes at the μE1 beam line permit an improved search with a sensitivity of σ(dμ)≤6×10−23ecm, about three orders of magnitude more sensitivity than for the current upper limit of |dμ|≤1.8×10−19ecm\,(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.
Original languageEnglish
PublisherCornell University
Number of pages28
Publication statusPublished - 17 Feb 2021

Publication series

NamearXiv preprint
PublisherCornell University


  • hep-ex
  • physics.ins-det


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