Limits on a CP-violating scalar axion-nucleon interaction
arXiv:1205.1776 · doi:10.1103/PhysRevD.86.015001
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.
5 pages, 4 figures, small textual changes in v2, matches published version
References in corpus (7)
- Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale
- Test of the Equivalence Principle Using a Rotating Torsion Balance
- Novel constraints on light elementary particles and extra-dimensional physics from the Casimir effect
- Improved constraints on non-Newtonian forces at 10 microns
- Preferred-Frame and CP-Violation Tests with Polarized Electrons
- Axions and the cooling of white dwarf stars
- A New Constraint for the Coupling of Axion-like particles to Matter via Ultra-Cold Neutron Gravitational Experiments