We calculate a dipole–dipole potential between fermions mediated by a light pseudoscalar, axion, paying a particular attention to the overall sign. While the sign of the potential is physical and important for experiments to discover or constrain the axion coupling to fermions, there is often a sign error in the literature. The purpose of this short note is to clarify the sign issue of the axion-mediated dipole–dipole potential. As a by-product, we find a sign change of the dipole–dipole potenital due to the different spin of the mediating particle.
|Number of pages||3|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2017 Sep 10|
ASJC Scopus subject areas
- Nuclear and High Energy Physics