F. Ferrer et Ja. Grifols, LONG-RANGE FORCES FROM PSEUDOSCALAR EXCHANGE - ART. NO. 096006, Physical review. D. Particles and fields, 5809(9), 1998, pp. 6006
Using dispersion theoretic techniques, we consider coherent long range
forces arising from double pseudoscalar exchange among fermions. We f
ind that Yukawa type coupling leads to 1/r(3) spin-independent attract
ive potentials whereas derivative coupling renders 1/r(5) spin-indepen
dent repulsive potentials. [S0556-2821(98)03721-7]