Deepest sensitivity to wavelike dark photon dark matter with superconducting radio frequency cavities

Abstract

Wavelike, bosonic dark matter candidates like axions and dark photons can be detected using microwave cavities known as haloscopes. Traditionally, haloscopes consist of tunable copper cavities operating in the TM${}_{010}$ mode, but ohmic losses have limited their performance. In contrast, superconducting radio frequency (SRF) cavities can achieve quality factors of $\sim 10^{10}$, perhaps five orders of magnitude better than copper cavities, leading to more sensitive dark matter detectors. In this paper, we first derive that the scan rate of a haloscope experiment is proportional to the loaded quality factor $Q_L$, even if the cavity bandwidth is much narrower than the dark matter halo line shape. We then present a proof-of-concept search for dark photon dark matter using a nontunable ultrahigh quality SRF cavity. We exclude dark photon dark matter with kinetic mixing strengths of $\chi >1.5\times 10^{-16}$ for a dark photon mass of $m_{A^{\prime }}=5.35\mu$eV, achieving the deepest exclusion to wavelike dark photons by almost an order of magnitude.

11 pages, 12 figures

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• Dark photon dark matter constraints at the Taiwan axion search experiment with haloscope
• Sensitivity of a Gigahertz Fabry-Pérot Resonator for Axion Dark Matter Detection