The sign of the dipole–dipole potential by axion exchange

Ryuji Daido, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)127-129
Number of pages3
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2017 Sept 10


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