Order of magnitude smaller limit on the electric dipole moment of the electron

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

770 Scopus citations


The Standard Model of particle physics is known to be incomplete. Extensions to the Standard Model, such as weak-scale supersymmetry, posit the existence of new particles and interactions that are asymmetric under time reversal (T) and nearly always predict a small yet potentially measurable electron electric dipole moment (EDM), de, in the range of 10 -27 to 10-30 e·cm. The EDM is an asymmetric charge distribution along the electron spin (S) that is also asymmetric under T. Using the polar molecule thorium monoxide, we measured de = (-2.1 ± 3.7stat ± 2.5syst) x 10-29 e·cm. This corresponds to an upper limit of |d e| < 8.7 x 10-29 e·cm with 90%confidence, an order of magnitude improvement in sensitivity relative to the previous best limit. Our result constrains T-violating physics at the TeV energy scale.

Original languageEnglish (US)
Pages (from-to)269-272
Number of pages4
Issue number6168
StatePublished - 2014

ASJC Scopus subject areas

  • General


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