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Several theoretical models have introduced an additional U(1) gauge field for dark matter to explain several experimental results showing a deviation from the standard model (SM) calculations, such as the measured value of the muon anomalous magnetic moment (g− 2)μ . The additional U(1) field couples very weakly with the SM, and its gauge boson, U , called as a "dark photon" mixes in ordinary photons with a very small mixing strength as a result. The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) has performed a search for electron pairs from a dark photon showing up within π,η Dalitz decays. Upper limits on the dark photon mixing strength has been obtained for 30 < mU < 90 MeV/c . Combining with the other recent experimental results, the dark photon is ruled out as the explanation of the desrepancy on (g− 2)μ between the measured result and SM calculations.

Dark photon search with neutral meson decays at the PHENIX experiment