This paper reports on a cavity haloscope search for dark matter axions in the galactic halo in the mass range 2.81-3.31μeV. 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.
@article{arxiv.1910.08638,
title = {Extended Search for the Invisible Axion with the Axion Dark Matter Experiment},
author = {T. Braine and R. Cervantes and N. Crisosto and N. Du and S. Kimes and L. J Rosenberg and G. Rybka and J. Yang and D. Bowring and A. S. Chou and R. Khatiwada and A. Sonnenschein and W. Wester and G. Carosi and N. Woollett and L. D. Duffy and R. Bradley and C. Boutan and M. Jones and B. H. LaRoque and N. S. Oblath and M. S. Taubman and J. Clarke and A. Dove and A. Eddins and S. R. O'Kelley and S. Nawaz and I. Siddiqi and N. Stevenson and A. Agrawal and A. V. Dixit and J. R. Gleason and S. Jois and P. Sikivie and N. S. Sullivan and D. B. Tanner and E. Lentz and E. J. Daw and J. H. Buckley and P. M. Harrington and E. A. Henriksen and K. W. Murch},
journal= {arXiv preprint arXiv:1910.08638},
year = {2020}
}