Preliminary ADMX Run1D Results

ORAL

Abstract

The existence of QCD axion is strongly motivated as a dynamical solution to the strong CP problem. By either the misalignment mechanism or by topological defect decays in the early universe, QCD axions may be the primary constituent of cold dark matter, which contributes 85% of the total mass in the standard cosmology. The Axion Dark Matter eXperiment (ADMX) is a pioneer QCD axion dark matter search experiment based on the Sikivie-type haloscope. With help from a dilution refrigerator and from ultra low noise quantum amplifiers, ADMX has achieved the sensitivity required for discovering both Kim–Shifman–Vainshtein–Zakharov (KSVZ) and Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) benchmark axion models, for O(1) µeV axion masses. In this talk, I will report the result of the recent data taking run at AMDX, exploring more than 100 MHz new parameter space around 5 µeV with KSVZ axion discovery ability.

*This work is supported by U.S. DOE through Awards No DE-SC0009800, No. DE-SC0009723, No. DE-SC0010296, No. DE-SC0010280, No. DE-SC0011665, No. DEFG02-97ER41029, No. DE-FG02-96ER40956, No. DE-AC52-07NA27344, No. DE-C03-76SF00098 and No. DE-SC0017987. Fermilab is a U.S. Department of Energy, Office of Science, HEP User Facility managed by Fermi Research Alliance, LLC (FRA), under Contract No. DE-AC02-07CH11359. Additional support was provided by the Heising-Simons Foundation. PNNL is a multi-program national laboratory operated for the U.S. DOE by Battelle Memorial Institute under Contract No. DE-AC05-76RL01830. CRB is supported by DOE Office of Science, High Energy Physics, Early Career Award (FWP 77794 at PNNL). U. of Western Australia participation funded by the ARC Centre of Excellence for Engineered Quantum Systems, CE170100009, and Dark Matter Particle Physics, CE200100008.

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Presenters

  • Dan Zhang

    • University of Washington

Authors

  • Dan Zhang

    • University of Washington