The sign of the dipole-dipole potential by axion exchange
High Energy Physics - Phenomenology
2017-12-27 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Experiment
High Energy Physics - Theory
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.
Cite
@article{arxiv.1704.00155,
title = {The sign of the dipole-dipole potential by axion exchange},
author = {Ryuji Daido and Fuminobu Takahashi},
journal= {arXiv preprint arXiv:1704.00155},
year = {2017}
}
Comments
8 pages, 1 figure. v2: a reference added, matches version published in PLB