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Searches for dark photons at accelerators
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abstract
Dark matter particles may interact with other dark matter particles via a new force mediated by a dark photon, $A^{\prime}$, which would be the dark-sector analog to the ordinary photon of electromagnetism. The dark photon can obtain a highly suppressed mixing-induced coupling to the electromagnetic current, providing a portal through which dark photons can interact with ordinary matter. This review focuses on $A^{\prime}$ scenarios that are potentially accessible to accelerator-based experiments. We summarize the existing constraints placed by such experiments on dark photons, highlight what could be observed in the near future, and discuss the major experimental challenges that must be overcome to improve sensitivities.
Forward citations
Cited by 8 Pith papers
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The Dark Side of a Tera-Z Factory
Future Tera-Z runs at FCC-ee/CEPC could indirectly probe TeV-scale t-channel dark matter portals through one-loop and two-loop electroweak precision shifts, and in leptophilic models would be the only planned experime...
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High Energy Photon Polarimetry at Lepton Colliders: Quantum Information from Converted Photons
Converted photons in Belle II enable high-significance measurements of Bell nonlocality, discord, concurrence, magic and steerability for macroscopically separated GeV diphotons, provided opening-angle resolution reac...
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Filling the Gap: Hunting for Vector Bosons at the MUonE Experiment with Displaced Decay Signature
MUonE's displaced-vertex search, combining muon-electron and muon-nucleus production, could probe vector-boson mediators up to ~150 MeV and close a documented parameter-space gap.
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Proof of principle for a light dark matter search with low-energy positron beams at NA64
A 70 GeV positron-beam missing-energy search at NA64 found zero signal events and set new dark photon limits, demonstrating the feasibility of a future low-energy positron program.
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Portal Matter and Scotogenic-like Dirac Neutrino Masses
One-loop diagrams from dark-charged scalars and fermions in an E6-like portal matter model generate Dirac neutrino masses near 0.05 eV.
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PBH formation and Gravitational Waves as Multi-messenger Signals of First-order Phase Transitions
False-vacuum collapse during first-order phase transitions can form PBHs and emit GWs across a broad parameter range, and MeV-scale classically conformal U(1)_{B-L} symmetry breaking has the largest region where both ...
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Dark Photon mediated Inelastic Dark Matter in Cosmology, Astrophysics and Colliders
Full relic-density-allowed parameter space of dark-photon inelastic dark matter is mapped at α_D=α_EM, with FASER sensitive up to Mχ1≈7 GeV and neutron-star heating up to ~2000 K.
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Simulation of dark photon sensitivity in $\eta \rightarrow \gamma e^+e^-$ at HIAF
Simulations of a proposed HIAF eta factory project a dark photon branching ratio limit of 10^-6 to 10^-7 and a kinetic mixing sensitivity of epsilon^2 about 10^-7 for masses up to 0.4 GeV.
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