Sensitive Search for a Permanent Muon Electric Dipole Moment
Y. K. Semertzidis, H. Brown, G. T. Danby, J. W. Jackson, R. Larsen, D. M. Lazarus, W. Meng, W. M. Morse, C. Ozben, R. Prigl, R. M. Carey, J. P. Miller, O. Rind, B. L. Roberts, L. R. Sulak, V. Balakin, A. Bazhan, A. Dudnikov, B. I. Khazin, G. Sylvestrov, Y. Orlov, K. Jungmann, P. T. Debevec, D. W. Hertzog, C. J. G. Onderwater, E. J. Stephenson, P. Cushman, I. Kronkvist, F. J. M. Farley
TL;DR
The muon EDM offers a sensitive probe of CP violation and potential new physics beyond the Standard Model. The paper proposes a dedicated storage-ring experiment that cancels the g-2 precession with a radial electric field, allowing EDM-induced spin precession to accumulate over time. It introduces a frozen-spin technique, employs lower-energy muons and strong motional fields to maximize sensitivity, and relies on high-intensity muon sources. Achieving about 1e-24 e cm could provide complementary constraints to muon g-2 and illuminate CP-violating effects in the lepton sector and future muon collider programs.
Abstract
We are proposing a new method to carry out a dedicated search for a permanent electric dipole moment (EDM) of the muon with a sensitivity at a level of 10^{-24} e cm. The experimental design exploits the strong motional electric field sensed by relativistic particles in a magnetic storage ring. As a key feature, a novel technique has been invented in which the g-2 precession is compensated with radial electric field. This technique will benefit greatly when the intense muon sources advocated by the developers of the muon storage rings and the muon colliders become available.