Limits on a CP-violating scalar axion-nucleon interaction
Abstract
Axions or similar hypothetical pseudoscalar bosons may have a small CP-violating scalar Yukawa interaction g_s(N) with nucleons, causing macroscopic monopole-dipole forces. Torsion-balance experiments constrain g_p(e) g_s(N), whereas g_p(N) g_s(N) is constrained by the depolarization rate of ultra-cold neutrons or spin-polarized nuclei. However, the pseudoscalar couplings g_p(e) and g_p(N) are strongly constrained by stellar energy-loss arguments and g_s(N) by searches for anomalous monopole-monopole forces, together providing the most restrictive limits on g_p(e) g_s(N) and g_p(N) g_s(N). The laboratory limits on g_s(N) are currently the most restrictive constraints on CP-violating axion interactions.
Keywords
Cite
@article{arxiv.1205.1776,
title = {Limits on a CP-violating scalar axion-nucleon interaction},
author = {Georg Raffelt},
journal= {arXiv preprint arXiv:1205.1776},
year = {2012}
}
Comments
5 pages, 4 figures, small textual changes in v2, matches published version