We use our recent electric dipole moment (EDM) measurement data to constrain the possibility that the HfF+ EDM oscillates in time due to interactions with candidate dark matter axion-like particles (ALPs). We employ a Bayesian analysis method which accounts for both the look-elsewhere effect and the uncertainties associated with stochastic density fluctuations in the ALP field. We find no evidence of an oscillating EDM over a range spanning from 27 nHz to 400 mHz, and we use this result to constrain the ALP-gluon coupling over the mass range 10−22−10−15 eV. This is the first laboratory constraint on the ALP-gluon coupling in the 10−17−10−15 eV range, and the first laboratory constraint to properly account for the stochastic nature of the ALP field.
@article{arxiv.2006.15787,
title = {Experimental constraint on axion-like particle coupling over seven orders of magnitude in mass},
author = {Tanya S. Roussy and Daniel A. Palken and William B. Cairncross and Benjamin M. Brubaker and Daniel N. Gresh and Matt Grau and Kevin C. Cossel and Kia Boon Ng and Yuval Shagam and Yan Zhou and Victor V. Flambaum and Konrad W. Lehnert and Jun Ye and Eric A. Cornell},
journal= {arXiv preprint arXiv:2006.15787},
year = {2021}
}