Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron

Author:

,Baron J.1,Campbell W. C.2,DeMille D.3,Doyle J. M.1,Gabrielse G.1,Gurevich Y. V.1,Hess P. W.1,Hutzler N. R.1,Kirilov E.3,Kozyryev I.3,O’Leary B. R.3,Panda C. D.1,Parsons M. F.1,Petrik E. S.1,Spaun B.1,Vutha A. C.4,West A. D.3

Affiliation:

1. Department of Physics, Harvard University, Cambridge, MA 02138, USA.

2. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA.

3. Department of Physics, Yale University, New Haven, CT 06511, USA.

4. Department of Physics and Astronomy, York University, Toronto, Ontario M3J 1P3, Canada.

Abstract

Stubbornly Spherical The shape of the electron's charge distribution reflects the degree to which switching the direction of time impacts the basic ingredients of the universe. The Standard Model (SM) of particle physics predicts a very slight asphericity of the charge distribution, whereas SM extensions such as supersymmetry posit bigger and potentially measurable, but still tiny, deviations from a perfect sphere. Polar molecules have been identified as ideal settings for measuring this asymmetry, which should be reflected in a finite electric dipole moment (EDM) because of the extremely large effective electric fields that act on an electron inside such molecules. Using electron spin precession in the molecule ThO, Baron et al. (p. 269 , published online 19 December; see the cover; see the Perspective by Brown ) measured the EDM of the electron as consistent with zero. This excludes some of the extensions to the SM and sets a bound to the search for a nonzero EDM in other facilities, such as the Large Hadron Collider.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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