We surrounded a rotating torsion pendulum containing 9.8×1022 polarized electrons by 2 or 4 stationary sources, each with a net spin of 6.0×1024 polarized electrons. Multiple source configurations gave sensitivity to hypothetical dipole-dipole, spin-dot-spin, and spin-cross-spin exchange interactions mediated by bosons with masses up to 20 μeV. For bosons with masses ≤0.1 μeV our null results for the dipole-dipole, spin-dot-spin, and spin-cross-spin forces imply 1σ upper limits on (gPe)2/(âc), (gAe)2/(âc) and (gVegAe)/(âc) of 2.2×10-16, 3.8×10-40, and 1.2×10 -28, respectively. We also constrain, for the first time, any possible linear combination of static spin-spin interactions. In this case our upper limits relax to 5.6×10-16, 9.8×10-40, and 1.2×10-28, respectively.
ASJC Scopus subject areas
- Physics and Astronomy(all)