The sign of the dipole-dipole potential by axion exchange
arXiv:1704.00155 · doi:10.1016/j.physletb.2017.06.027
Abstract
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.
arXiv comment8 pages, 1 figure. v2: a reference added, matches version published in PLB
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