Storage-ring systematic errors at the proton EDM sensitivity goal
In plain words
A proton electric dipole moment would slowly tilt the spins of stored protons; stray fields and ring misalignments tilt them too, and must be suppressed below the tiny expected signal.
Precise statement
In a frozen-spin all-electric ring for protons at the magic momentum $0.7007\,\mathrm{GeV}/c$, an EDM d rotates the spin vertically, with target sensitivity $d \sim 1e-29\,e\,\mathrm{cm}$. Determine whether counter-rotating beams and field reversals suppress spurious vertical spin rotation from radial magnetic fields, geometric phases of misaligned elements and vertical velocity to below the EDM signal at achievable alignment tolerances, with spin coherence time above $1e3\,\mathrm{s}$.
What would settle it
Spin-tracking simulations with realistic error spectra plus a prototype-ring measurement of the residual false signal.