1. First results from a microwave cavity axion search at 24 micro-eV
- Author
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Brubaker, B. M., Zhong, L., Gurevich, Y. V., Cahn, S. B., Lamoreaux, S. K., Simanovskaia, M., Root, J. R., Lewis, S. M., Kenany, S. Al, Backes, K. M., Urdinaran, I., Rapidis, N. M., Shokair, T. M., van Bibber, K. A., Palken, D. A., Malnou, M., Kindel, W. F., Anil, M. A., Lehnert, K. W., and Carosi, G.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics ,High Energy Physics - Experiment - Abstract
We report on the first results from a new microwave cavity search for dark matter axions with masses above $20~\mu\text{eV}$. We exclude axion models with two-photon coupling $g_{a\gamma\gamma} \gtrsim 2\times10^{-14}~\text{GeV}^{-1}$ over the range $23.55~\mu\text{eV} < m_a < 24.0~\mu\text{eV}$. These results represent two important achievements. First, we have reached cosmologically relevant sensitivity an order of magnitude higher in mass than any existing limits. Second, by incorporating a dilution refrigerator and Josephson parametric amplifier, we have demonstrated total noise approaching the standard quantum limit for the first time in an axion search., Comment: 5 pages, 3 figures, accepted for publication in PRL. v2: added changes made during the review process
- Published
- 2016
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