New Limit on Dark Photon Kinetic Mixing in the 0.2-1.2 $\boldsymbolμ$eV Mass Range From the Dark E-Field Radio Experiment

Le résumé fourni par la source

We report new limits on the kinetic mixing strength of the dark photon spanning the mass range 0.21 -- 1.24 $μ$eV corresponding to a frequency span of 50 -- 300 MHz. The Dark E-Field Radio experiment is a wide-band search for dark photon dark matter. In this paper we detail changes in calibration and upgrades since our proof-of-concept pilot run. Our detector employs a wide bandwidth E-field antenna moved to multiple positions in a shielded room, a low noise amplifier, wideband ADC, followed by a $2^{24}$-point FFT. An optimal filter searches for signals with Q $\approx10^6$. In nine days of integration, this system is capable of detecting dark photon signals corresponding to $ε$ several orders of magnitude lower than previous limits. We find a 95% exclusion limit on $ε$ over this mass range between $6\times 10^{-15}$ and $6\times 10^{-13}$, tracking the complex resonant mode structure in the shielded room.

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