Kavli Affiliate: Noah A. Kurinsky
| First 5 Authors: Stefan Knirck, Gabe Hoshino, Mohamed H. Awida, Gustavo I. Cancelo, Martin Di Federico
| Summary:
We present first results from a dark photon dark matter search in the mass
range from 44 to 52 $mu{rm eV}$ ($10.7 – 12.5,{rm GHz}$) using a
room-temperature dish antenna setup called GigaBREAD. Dark photon dark matter
converts to ordinary photons on a cylindrical metallic emission surface with
area $0.5,{rm m}^2$ and is focused by a novel parabolic reflector onto a horn
antenna. Signals are read out with a low-noise receiver system. A first data
taking run with 24 days of data does not show evidence for dark photon dark
matter in this mass range, excluding dark photon – photon mixing parameters
$chi gtrsim 10^{-12}$ in this range at 90% confidence level. This surpasses
existing constraints by about two orders of magnitude and is the most stringent
bound on dark photons in this range below 49 $mu$eV.
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