A global QCD fit to deep-inelastic scattering prefers a dark photon with mass 4 to 6 GeV and mixing 0.06 to 0.12, claimed as a 6.5 sigma hint, though direct searches exclude these parameters unless extra dark matter couplings are invoked.
Aaltonen et al.,High-precision measurement of the饾憡 boson mass with the CDF II detector,Science 376 (2022), no
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Evidence for and implications of a dark photon
A global QCD fit to deep-inelastic scattering prefers a dark photon with mass 4 to 6 GeV and mixing 0.06 to 0.12, claimed as a 6.5 sigma hint, though direct searches exclude these parameters unless extra dark matter couplings are invoked.