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

  • Author(s): ACME Collaboration
  • Baron, J
  • Campbell, WC
  • DeMille, D
  • Doyle, JM
  • Gabrielse, G
  • Gurevich, YV
  • Hess, PW
  • Hutzler, NR
  • Kirilov, E
  • Kozyryev, I
  • O'Leary, BR
  • Panda, CD
  • Parsons, MF
  • Petrik, ES
  • Spaun, B
  • Vutha, AC
  • West, AD
  • West, AD
  • et al.

Published Web Location

https://doi.org/10.1126/science.1248213
No data is associated with this publication.
Abstract

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), d(e), 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 d(e) = (-2.1 ± 3.7stat ± 2.5syst) × 10(-29) e·cm. This corresponds to an upper limit of |d(e)| < 8.7 × 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.

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This item is under embargo until December 31, 2999.