First Results from Axion Haloscope at CAPP around 10.7 $\mu$eV

TL;DR

This paper reports the first results from an axion dark matter search using ultra-low temperature microwave resonators, excluding certain axion mass ranges with high sensitivity at temperatures below 40 mK.

Contribution

First experimental results from an axion haloscope at CAPP, exploring new mass ranges with unprecedented low-temperature resonators and sensitivity.

Findings

Excluded axion mass range 10.7126-10.7186 μeV at near KSVZ coupling

Excluded axion mass range 10.16-11.37 μeV with 9 times larger coupling

First axion search results in these specific ranges

Abstract

The Center for Axion and Precision Physics research at the Institute for Basic Science is searching for axion dark matter using ultra-low temperature microwave resonators. We report the exclusion of the axion mass range 10.7126$-$10.7186 $\mu$eV with near Kim-Shifman-Vainshtein-Zakharov (KSVZ) coupling sensitivity and the range 10.16$-$11.37 $\mu$eV with about 9 times larger coupling at 90$\%$ confidence level. This is the first axion search result in these ranges. It is also the first with a resonator physical temperature of less than 40 mK.