Dark Matter Axion Search with HAYSTAC Phase II

Xiran Bai^{1

2}, M J Jewell^{1

2}, J Echevers³, K van Bibber³, A Droster³, Maryam H Esmat⁴, Sumita Ghosh^{2

5}, Eleanor Graham^{1

2}, H Jackson³, Claire Laffan^{1

2}, S K Lamoreaux^{1

2}, A F Leder³, K W Lehnert^{1

2}, S M Lewis³, R H Maruyama^{1

2}, R D Nath³, N M Rapidis³, E P Ruddy^{6

7}, M Silva-Feaver^{1

2}, M Simanovskaia³, Sukhman Singh^{1

2}, D H Speller⁴, Sabrina Zacarias^{1

2}, Yuqi Zhu^{1

2}; HAYSTAC Collaboration

Affiliations

¹ Yale University, Department of Physics, New Haven, Connecticut 06511, USA.
² Yale University, Wright Laboratory, Department of Physics, New Haven, Connecticut 06520, USA.
³ University of California Berkeley, Department of Nuclear Engineering, Berkeley, California 94720, USA.
⁴ The Johns Hopkins University, Department of Physics and Astronomy, Baltimore, Maryland 21218, USA.
⁵ Yale University, Department of Applied Physics, New Haven, Connecticut 06520, USA.
⁶ University of Colorado, Department of Physics, Boulder, Colorado 80309, USA.
⁷ The University of Colorado, National Institute of Standards and Technology, JILA, Boulder, Colorado 80309, USA.

PMID: 40315518
DOI: 10.1103/PhysRevLett.134.151006

Dark Matter Axion Search with HAYSTAC Phase II

Xiran Bai et al. Phys Rev Lett. 2025.

. 2025 Apr 18;134(15):151006.

doi: 10.1103/PhysRevLett.134.151006.

Authors

Affiliations

¹ Yale University, Department of Physics, New Haven, Connecticut 06511, USA.
² Yale University, Wright Laboratory, Department of Physics, New Haven, Connecticut 06520, USA.
³ University of California Berkeley, Department of Nuclear Engineering, Berkeley, California 94720, USA.
⁴ The Johns Hopkins University, Department of Physics and Astronomy, Baltimore, Maryland 21218, USA.
⁵ Yale University, Department of Applied Physics, New Haven, Connecticut 06520, USA.
⁶ University of Colorado, Department of Physics, Boulder, Colorado 80309, USA.
⁷ The University of Colorado, National Institute of Standards and Technology, JILA, Boulder, Colorado 80309, USA.

PMID: 40315518
DOI: 10.1103/PhysRevLett.134.151006

Abstract

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 μeV of newly scanned parameter space in the mass ranges 17.28-18.44 μeV and 18.71-19.46 μeV. 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 μeV of parameter space has now been scanned between 16.96-19.46 μeVμ 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.

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Dark Matter Axion Search with HAYSTAC Phase II

Affiliations

Dark Matter Axion Search with HAYSTAC Phase II

Authors

Affiliations

Abstract

LinkOut - more resources

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