Axion Dark Matter Search around 4.55 $\mu$eV with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity

TL;DR

This paper reports a sensitive search for axion dark matter around 4.55 μeV using the CAPP-12TB haloscope, setting new limits on axion-photon coupling and excluding certain axion models within that mass range.

Contribution

First experimental search at Dine-Fischler-Srednicki-Zhitnitskii sensitivity with the CAPP-12TB haloscope, providing new constraints on axion-photon coupling in the 4.51-4.59 μeV range.

Findings

Excluded axion-photon coupling down to 6.2×10⁻¹⁶ GeV⁻¹

Constrained axion models contributing 13% of local dark matter

Demonstrated continued search capability over a wide mass range

Abstract

We report an axion dark matter search at Dine-Fischler-Srednicki-Zhitnitskii sensitivity with the CAPP-12TB haloscope, assuming axions contribute 100\% of the local dark matter density. The search excluded the axion--photon coupling $g_{a\gamma\gamma}$ down to about $6.2\times10^{-16}$ GeV$^{-1}$ over the axion mass range between 4.51 and 4.59 $\mu$eV at a 90\% confidence level. The achieved experimental sensitivity can also exclude Kim-Shifman-Vainshtein-Zakharov axion dark matter that makes up just 13\% of the local dark matter density. The CAPP-12TB haloscope will continue the search over a wide range of axion masses.