Extended Search for the Invisible Axion with the Axion Dark Matter Experiment

TL;DR

This paper presents an advanced cavity haloscope experiment that searches for dark matter axions in a specific mass range, achieving unprecedented sensitivity and exploring new cavity configurations to test axion models.

Contribution

It introduces a novel cavity configuration for mode crossing searches and employs ultra low-noise amplification, setting new sensitivity benchmarks in axion detection.

Findings

Excluded the full axion-photon coupling range predicted by benchmark models.

First haloscope search at mode crossings with an alternate cavity design.

Achieved unprecedented sensitivity using Josephson parametric amplification.

Abstract

This paper reports on a cavity haloscope search for dark matter axions in the galactic halo in the mass range $2.81$-$3.31$ ${\mu}eV$. This search excludes the full range of axion-photon coupling values predicted in benchmark models of the invisible axion that solve the strong CP problem of quantum chromodynamics, and marks the first time a haloscope search has been able to search for axions at mode crossings using an alternate cavity configuration. Unprecedented sensitivity in this higher mass range is achieved by deploying an ultra low-noise Josephson parametric amplifier as the first stage signal amplifier.