Speaker
Description
We report on a direct search for dark photon dark matter with the DOSUE-RR experiment in the mass range of 80–160 $\mu \rm{eV}/c^2$, corresponding to 19-38 GHz. Dark photon dark matter can convert into ordinary photons at a conducting surface, producing a narrow-band millimeter-wave signal whose frequency is determined by the dark photon mass. The experiment searches for this signal using a cryogenic millimeter-wave receiver and a metallic conversion surface.
The present search builds on our previous measurement in the 80–110 $\mu \rm{eV}/c^2$ region and extends the search up to 160 $\mu \rm{eV}/c^2$. A key upgrade is a newly developed wide-band deadtime-free spectrometer using a RFSoC chip, which replaces the former commercial 2 MHz-band spectrometer and enables simultaneous acquisition over a bandwidth of up to 4 GHz. In the present search, this wide-band acquisition increased the effective integration time per frequency by more than four orders of magnitude compared with our previous measurement. With this improved sensitivity, we extended the search to 160 $\mu \rm{eV}/c^2$ and reached sensitivity to kinetic-mixing values more than an order of magnitude below representative existing indirect constraints over most of the 110–160 $\mu \rm{eV}/c^2$ region.
We will present the experimental setup, calibration procedure, data analysis, and preliminary search results in the 80–160 $\mu \rm{eV}/c^2$ mass range.
| Primary Abstract Topic | Experiment: Axions and Wave-Like-DM |
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