Electroweak precision data set mass-dependent upper limits on dark photon mixing, and the Z width adds direct 95 percent bounds on its coupling to a 10 GeV dark fermion.
Holdom,Two U(1)’s and Epsilon Charge Shifts,Phys
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Constraints on the dark sector from electroweak precision observables
Electroweak precision data set mass-dependent upper limits on dark photon mixing, and the Z width adds direct 95 percent bounds on its coupling to a 10 GeV dark fermion.