Improved Limits on Spin-Mass Interactions.

  title={Improved Limits on Spin-Mass Interactions.},
  author={Junyi Lee and Attaallah Almasi and Michael V. Romalis},
  journal={Physical review letters},
  volume={120 16},
Very light particles with CP-violating couplings to ordinary matter, such as axions or axionlike particles, can mediate long-range forces between polarized and unpolarized fermions. We describe a new experimental search for such forces between unpolarized nucleons in two 250 kg Pb weights and polarized neutrons and electrons in a ^{3}He-K comagnetometer located about 15 cm away. We place improved constraints on the products of scalar and pseudoscalar coupling constants, g_{p}^{n}g_{s}^{N}<4.2… 

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