Extended Search for the Invisible Axion with the Axion Dark Matter Experiment
T. Braine, R. Cervantes, N. Crisosto, N. Du, S. Kimes, L. J. Rosenberg, G. Rybka, J. Yang, D. Bowring, A. S. Chou, Rakshya Khatiwada, A. Sonnenschein, W. C. Wester, G. Carosi, N. Woollett, L. D. Duffy, Richard F. Bradley, C. Boutan, Mark Jones, B. H. LaRoque, N. S. Oblath, M. S. Taubman, John Clarke, Allison Dove, Andrew Eddins, S. R. O’Kelley, Shahid Nawaz, Irfan Siddiqi, Noah Stevenson, Ankur Agrawal, Akash Dixit, J. R. Gleason, S. Jois, P. Sikivie, J. Solomon, N. S. Sullivan, D. B. Tanner, E. Lentz, E. J. Daw, J. H. Buckley, P. M. Harrington, Erik Henriksen, K. W. Murch
Abstract
This Letter reports on a cavity haloscope search for dark matter axions in the Galactic halo in the mass range 2.81-3.31 μeV. This search utilizes the combination of a low-noise Josephson parametric amplifier and a large-cavity haloscope to achieve unprecedented sensitivity across this mass range. 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.