Kavli Affiliate: Yevgeny Stadnik
| Summary:
We report on a laboratory search for ultralight dark photon dark matter using a single-site, two-sensor scalar magnetometer array. The experiment employs two scalar optically pumped magnetometers (OPMs) operated in a differential configuration to suppress common-mode noise and enhance sensitivity to spatially coherent dark photon fields. We analyze 10.5 hours of continuous data with a six-channel complex data vector evaluated at the three physical frequencies of the expected dark photon signal triplet. Assuming Gaussian noise, we develop a likelihood framework to set robust, frequency-resolved upper limits on the kinetic-mixing parameter $varepsilon$, which governs the coupling between Standard Model photons and dark photons. Within the mass range $4times10^-15,mathrmeV leq m_A’ leq 3times10^-14,mathrmeV$, we obtain the most stringent direct laboratory limits to date on $varepsilon$, complementing existing astrophysical bounds including those inferred from observations of the Leo-T dwarf galaxy.
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