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  1. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review Letters)
    This Letter reports new results from the HAYSTAC experiment’s search for dark matter axions in our galactic halo. It represents the widest search to date that utilizes squeezing to realize subquantum limited noise. The new results cover 1.71     μ eV of newly scanned parameter space in the mass ranges 17.28 – 18.44     μ eV and 18.71 – 19.46     μ eV . No statistically significant evidence of an axion signal was observed, excluding couplings | g γ | ≥ 2.75 × | g γ KSVZ | and | g γ | ≥ 2.96 × | g γ KSVZ | at the 90% confidence level over the respective region. By combining this data with previously published results using HAYSTAC’s squeezed state receiver, a total of 2.27     μ eV of parameter space has now been scanned between 16.96 – 19.46     μ eV μ     eV , excluding | g γ | ≥ 2.86 × | g γ KSVZ | at the 90% confidence level. These results demonstrate the squeezed state receiver’s ability to probe axion models over a significant mass range while achieving a scan rate enhancement relative to a quantum-limited experiment. Published by the American Physical Society2025 
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    Free, publicly-accessible full text available April 1, 2026
  2. ; ; ; ; (, Journal of Instrumentation)
    Abstract This study explores the primary effects of dielectric materials in a resonant cavity-based search for axion dark matter. While dielectrics prove beneficial in numerous cases, their incorporation may lead to less-than-optimal performance, especially for the lowest TM mode. Additionally, the stronger confinement of the electric field inside the dielectrics can exacerbate mode mixings, in particular for higher-order modes. Case studies have been carried out using a combination of analytical solutions and numerical simulations. The findings indicate dielectric cavities employing the TM 010 mode experience a significant reduction in sensitivity when compared to a similar search conducted in a cavity at equivalent frequency using no dielectrics. 
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  3. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review D)
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  4. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review D)
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