New upper limits on the dark photon kinetic mixing parameter ε are derived from geomagnetic data for masses between 1e-15 and 2e-13 eV, improving prior ground-based constraints.
Criterion 2) ensures the persistency of the signal, and criterion 3) eliminates spectral lines that are likely produced by analog filters or the digitizer
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Searching for dark photon dark matter from terrestrial magnetic fields
New upper limits on the dark photon kinetic mixing parameter ε are derived from geomagnetic data for masses between 1e-15 and 2e-13 eV, improving prior ground-based constraints.