Abstract
New laboratory constraints are obtained on exotic interactions between electrons through pseudoscalar or pseudovector coupling by analyzing a recent measurement of the magnetic dipole-dipole interaction between two iron atoms at the nanometer scale. The analysis imposes the strongest bounds on the pseudovector coupling constant between electrons for exchange bosons heavier than 1 eV. Even with the counterpart of electron-positron interaction considered by assuming invariance, the constraints are still the most stringent for bosons in the mass range from 1 eV to 20 eV. The constraints on the pseudoscalar coupling constant are only stronger than the limits derived from the trapped-strontium-ion experiment for exchange bosons heavier than 0.14 eV. Furthermore, a new experiment for more stringent constraints is proposed by measuring the interaction between one iron atom and multiple Holmium atoms.
- Received 13 June 2017
DOI:https://doi.org/10.1103/PhysRevD.96.055028
© 2017 American Physical Society