Axion Dark Matter Search around 4.55 $\hat{I}¼$eV with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity

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 $g_{a{\hat{I}}^3{\hat{I}}^3}$ down to about $6.2\times 10^{-16}$ GeV${}^{-1}$ over the axion mass range between 4.51 and 4.59 $\hat{I}¼$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.

7 pages, 6 figures