The exchange of light pseudoscalar quanta between fermions leads to long-range spin-dependent forces in order g², where g is the pseudoscalar-fermion coupling constant. We demonstrate that laboratory bounds on the Yukawa couplings of pseudoscalars to nucleons can be significantly improved using results from recent equivalence principle experiments, which are sensitive to the spin-independent long-range forces that arise in order g⁴ from two-pseudoscalar exchange.
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Fischbach et al. (1999) studied this question.
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