Is the electron EDM nonzero above $10^{-31}$ e cm?
In plain words
No electron dipole has been seen down to 4 parts in $10^{30}$ of an electron charge times a centimeter. Next-generation molecule experiments aim to look ten times deeper, where many theories with new heavy particles predict a signal.
Precise statement
Current bound $\mid d_{e}\mid < 4.1 \times 10^{-30}\,e\,\mathrm{cm}$ (90% CL, JILA HfF+, 2023), with the Standard Model contribution many orders smaller. Determine whether $d_{e}$ (or the equivalent electron-nucleon coupling $C_{\mathrm{S}}$) is nonzero at the $10^{-31}\,e\,\mathrm{cm}$ level using polar molecules (ThO, ThF+, YbOH, BaF or others).
What would settle it
A molecular EDM measurement with statistical and systematic uncertainty near $10^{-31}$ e cm, confirmed in a second species.
Status in the literature
Unverified note: it names recent work and was partly written without a live literature search; it awaits a check by an editor.
JILA's third-generation ThF+ experiment and ACME III (ThO) report progress toward roughly $10^{-31}$ e cm sensitivity as of 2026.
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