Exotic spin-dependent forces between electrons and nucleons
In plain words
New particles could make spinning electrons or nuclei attract or repel each other in ways depending on spin direction and velocity. Magnetometers, comagnetometers and diamond defect sensors look for these forces at distances from micrometers to meters.
Precise statement
Within the Dobrescu-Mocioiu operator basis $V_{1}$ to $V_{16}$ for exchange of a boson of range $\lambda$ from 1 micron to 1 m, determine whether any spin-dependent potential between electrons, between electrons and nucleons, or between nucleons is present above current comagnetometer, torsion-pendulum and NV-center limits.
What would settle it
A spin-polarized source-mass experiment with a reproducible signal that scales with source polarization and separation as predicted for one operator.
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