paper

Improved Limits on Spin-Mass Interactions

arXiv:1801.02757 · doi:10.1103/PhysRevLett.120.161801

Abstract

Very light particles with CP-violating couplings to ordinary matter, such as axions or axion-like 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 He-K co-magnetometer located about 15 cm away. We place improved constrains on the products of scalar and pseudoscalar coupling constants, and (95% CL) for axion-like particle masses less than eV, which represents an order of magnitude improvement over the best previous neutron laboratory limit.

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