Search for Invisible Axion Dark Matter in the 3.3-4.2 μeV Mass Range

Phys Rev Lett. 2021 Dec 24;127(26):261803. doi: 10.1103/PhysRevLett.127.261803.

Abstract

We report the results from a haloscope search for axion dark matter in the 3.3-4.2 μeV mass range. This search excludes the axion-photon coupling predicted by one of the benchmark models of "invisible" axion dark matter, the Kim-Shifman-Vainshtein-Zakharov model. This sensitivity is achieved using a large-volume cavity, a superconducting magnet, an ultra low noise Josephson parametric amplifier, and sub-Kelvin temperatures. The validity of our detection procedure is ensured by injecting and detecting blind synthetic axion signals.