A Q-band haloscope excludes dark photon kinetic mixing below 2.5e-12 in the mass range 137.05 to 137.07 micro-electronvolts, roughly three orders of magnitude stronger than the previous astronomical limit.
Abi, et al., Measurement of the Positive Muon Anoma- lous Magnetic Moment to 0.46 ppm
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Haloscope Searching for Dark Photons at Q-band with a Novel Coupling Tuning Structure
A Q-band haloscope excludes dark photon kinetic mixing below 2.5e-12 in the mass range 137.05 to 137.07 micro-electronvolts, roughly three orders of magnitude stronger than the previous astronomical limit.