Abstract
Dark Photons are hypothetical extra-U(1) gauge bosons, which are motivated by a number of astrophysical anomalies as well as the presently seen deviation between the Standard Model prediction and the direct measurement of the anomalous magnetic moment of the muon, (g − 2)μ . The Dark Photon does not serve as the Dark Matter particle itself, but acts as a messenger particle of a hypothetical Dark Sector with residual interaction to the Standard Model. We review recent Dark Photon searches, which were carried out in a global effort at various hadron and particle physics facilities. We also comment on the perspectives for future invisble searches, which directly probe the existence of Light Dark Matter particles.
Highlights
Initial State Radiation (ISR): A wide range of Dark Photon masses can be probed by looking for Dark Photons, which are produced via the ISR process, see Fig. 3
High-intensity accelerators, as the ones operated at JLAB or Mainz, have the potential to produce per year in the order of 1021 electrons on target (EOT)
For such kind of searches the experimental techniques to detect the LDM candidate could be similar to the techniques used in classical Dark Matter experiments
Summary
Dark Photons are hypothetical particles of an extra U(1) gauge group. The upper diagram shows the kinetic mixing between the Standard Model photon and the hypothetical Dark Photon γ (aka A , Z , or U boson) via a loop of charged leptons, L. Such a kinetic mixing term was propsed already in the 80’s by Holdom [3]. An anomaly was observed in a nuclear decay of Berryllium [4] This could be a first hint for a 17 MeV Dark Photon signal, the confirmation of the anomaly by an independent group is pending
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