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Precision Electroweak Tensions and a Dark Photon
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abstract
We examine how different assumptions about the hadronic vacuum polarization, the $W$ boson mass, and the forward-backward asymmetry in $b$-quarks at the $Z$ pole can impact the precision electroweak fit. We study the implications for a kinetically mixed dark photon, addressing the complementarity of precision bounds and direct searches, particularly in the case where the dark photon can decay into the dark sector, and we consider implications for future Large Hadron Collider searches. We comment on cases where the precision effects of the dark photon may not be well-described by the oblique parameters.
Forward citations
Cited by 2 Pith papers
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Vector Portals at Future Lepton Colliders
Future lepton colliders could probe dark photon and L_mu-L_tau vector portals with one to two orders of magnitude better sensitivity than current constraints across masses from tens of GeV to a few TeV.
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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.
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