A New Limit on the Electron Electric Dipole Moment
The electron is expected to have an electric dipole moment
(d_e), though it has so far eluded experimental observation. While
the Standard Model's prediction for d_e is still far beyond any
foreseeable experiment, new physical theories (especially
Supersymmetry) predict values for d_e that are near the experimental
upper limit. The ACME Collaboration recently performed a search for
d_e via a precision spin precession measurement in a beam of polar ThO
molecules [arXiv:1310.7534]. Our measurement did not see any
evidence for a non-zero d_e, but we did set the limit |d_e| <
8.7*10^-29 e*cm. This represents an order of magnitude improvement
over the previous best limit, and places tighter restrictions on new
physics beyond the Standard Model.
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