The search for low-mass axion dark matter with ABRACADABRA-10cm
Chiara P. Salemi, Joshua W. Foster, Jonathan L. Ouellet, Andrew Gavin,, Kaliroe M. W. Pappas, Sabrina Cheng, Kate A. Richardson, Reyco Henning,, Yonatan Kahn, Rachel Nguyen, Nicholas L. Rodd, Benjamin R. Safdi, Lindley, Winslow

TL;DR
This paper reports on a highly sensitive search for low-mass axion dark matter using the ABRACADABRA-10cm experiment, setting new upper limits on axion-photon coupling in the 0.41-8.27 neV mass range.
Contribution
The study introduces the first broadband ABRACADABRA-10cm experiment results with world-leading sensitivity, constraining axion-photon coupling in a key mass range for dark matter.
Findings
No evidence for axions was found.
Set 95% upper limits on axion-photon coupling at $g_{a o ext{γγ}}<3.2 imes10^{-11}$ GeV$^{-1}$.
Established the most sensitive constraints in the 0.41 - 8.27 neV mass range.
Abstract
Two of the most pressing questions in physics are the microscopic nature of the dark matter that comprises 84% of the mass in the universe and the absence of a neutron electric dipole moment. These questions would be resolved by the existence of a hypothetical particle known as the quantum chromodynamics (QCD) axion. In this work, we probe the hypothesis that axions constitute dark matter, using the ABRACADABRA-10cm experiment in a broadband configuration, with world-leading sensitivity. We find no significant evidence for axions, and we present 95% upper limits on the axion-photon coupling down to the world-leading level GeV, representing one of the most sensitive searches for axions in the 0.41 - 8.27 neV mass range. Our work paves a direct path for future experiments capable of confirming or excluding the hypothesis that dark matter is a…
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