Extended Haloscope Search and Exclusion of a Candidate Signal near 1.036 GHz

Abstract

We report a follow-up axion haloscope search near 1.036 GHz that completes and extends our previous work [Phys. Rev. X 14, 031023 (2024)], in which a portion of the HEMT-based data could not be analyzed due to unrecorded experimental information. While recovering this dataset, we identified an excess near 1.036 GHz that satisfied our candidate-selection criteria, motivating dedicated validation studies, including independent cross-checks and re-examination with the original apparatus. The excess did not persist under these investigations and was not confirmed as an axion dark-matter signal. We subsequently extended the search over a 20-MHz band surrounding the candidate using a quantum-noise-limited amplifier, achieving sensitivity close to the Dine-Fischler-Srednicki-Zhitnitsky benchmark. In the absence of a confirmed signal, we set improved 90% confidence-level upper limits on the axion-photon coupling over the frequency range 1.026-1.045 GHz. This work highlights the importance of robust candidate-validation strategies as haloscope searches approach discovery-level sensitivity.

8 pages, 5 figures

References in corpus (26)

• Extended Search for the Invisible Axion with the Axion Dark Matter Experiment
• A quantum-enhanced search for dark matter axions
• Search for "Invisible" Axion Dark Matter in the $3.3\text{-}4.2\mu$eV Mass Range
• Axion Dark Matter Search around 6.7 $\mu$eV
• Galactic axions search with a superconducting resonant cavity
• First Results from Axion Haloscope at CAPP around 10.7 $\mu$eV
• Piezoelectrically Tuned Multimode Cavity Search for Axion Dark Matter
• Search for invisible axion dark matter of mass m${}_a=43\mu$eV with the QUAX--$a\gamma$ experiment
• Search for invisible axion dark matter with a multiple-cell haloscope
• Search for Dark Matter Axions with CAST-CAPP
• Searching for Invisible Axion Dark Matter with an 18T Magnet Haloscope
• Axion Dark Matter Search around 4.55 $\mu$eV with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity
• Dark Matter Axion Search Using a Josephson Traveling Wave Parametric Amplifier
• Revisiting the detection rate for axion haloscopes
• Search for galactic axions with a high-Q dielectric cavity
• Near-Quantum-Noise Axion Dark Matter Search at CAPP around 9.5 $\mu$eV
• Search for galactic axions with a traveling wave parametric amplifier
• Search for Axion dark matter with the QUAX-LNF tunable haloscope
• Axion Dark Matter eXperiment around 3.3 μeV with Dine-Fischler-Srednicki-Zhitnitsky Discovery Ability
• Dark Matter Axion Search with HAYSTAC Phase II
• Extended Axion Dark Matter Search Using the CAPP18T Haloscope
• Mapping Dark Matter in the Milky Way using Normalizing Flows and Gaia DR3
• RADES axion search results with a High-Temperature Superconducting cavity in an 11.7 T magnet
• Near-quantum-limited axion dark matter search with the ORGAN experiment around 26 $\mu$eV
• Search for Axion Dark Matter from 1.1 to 1.3 GHz with ADMX
• Search for post-inflationary QCD axions with a quantum-limited tunable microwave receiver