Muon EDM

J-PARC Letter of Intent: Search for a Permanent Muon Electric Dipole Moment at the 10^-24 e·cm Level.
In postscript format. (4.6MB). The same file in PDF   (0.85MB) or in gzipped   (1.2MB). The figures reproduce best in ps and ps.gz.

Authors: Muon EDM collaboration

Inclinometer Home Page: Tiltmeter Home Page.
A very sensitive tiltmeter development at BNL for the EDM experiment. Its sensitivity is projected to be better than 1nrad.

Physics of the muon EDM Experiment:

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. Muon Spin Precession without Electric Field Compensation and with Electric Field Compensation. The EDM signature is the time dependent muon spin precession vertically: Vertical Muon Spin Precession, observed with the following Detection Method of the Muon Spin Direction.

The standard model of particle physics is a very successful theoretical framework, which describes all confirmed observations to date. However, the model leaves important questions concerning the physical nature of observed processes unexplained, although it provides an accurate description of them. Among the not yet understood phenomena are the reasons for parity violation, the particle masses, the violation of the CP symmetry. CP violation is the only known mechanism that could explain the matter antimatter asymmetry found in the universe. In order to obtain a deeper insight, speculative models have been suggested which often are connected to observable deviations from standard theory predictions, particularly violations of assumed symmetries or yet unknown properties of particles. The spectrum of these theories includes super symmetry (SUSY), left-right symmetry, multi Higgs scenarios and many other important approaches. For more details go to Physics of EDM. For a short description of the Muon EDM experimental concept go to Short Paper on EDM (ps format).

A large part of the "EDMs in storage rings" method is built on our experience with spin and beam dynamics in a storage ring after many years working on the muon g-2 experiment. Papers on the new method can be found in [ muon_EDM, deuteron_EDM]. Many speculative theories beyond the SM predict EDM values well within the sensitivity of both experiments. See, e.g., Enhanced Electric Dipole Moment of the Muon...   by Babu et al., PRL 85, 5064 (2000), and Probing CP Violation with the Deuteron Electric Dipole Moment , hep-ph/0402023 by By Oleg Lebedev (DESY), Keith A. Olive (Minnesota U., Theor. Phys. Inst.), Maxim Pospelov (Victoria U.), and Adam Ritz (CERN) which claims that at 3x10^-27 e·cm the deuteron EDM experiment will be 10 to 100 times better than the best current EDM experimental limit.

For the muon g-2 WEB page at BNL go to Muon g-2 page at BNL.

The Boston g-2 WEB page: BU g-2 page.

Last Modified: November 1, 2009
Please forward all questions about this site to: Yannis Semertzidis

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