Abstract
The PADME (Positron Annihilation Dark Matter Experiment) collaboration searches for a dark mediator produced in positron-electron annihilation by using a relatively simple apparatus and the existing positron beam of the Beam Test Facility at Laboratori Nazionali di Frascati. The experiment could detect dark photons decaying in visible and invisible channels by using the missing mass reconstruction technique. This is accomplished by an excellent electromagnetic calorimeter, a thin diamond active target, and a system of efficient veto detectors to strongly reduce the background. Without major upgrades on the beam line, the sensitivity range on the coupling is expected to be ϵ ≳ 10−3 for a dark mediator mass of mA′≤23.7 MeV/c2 after six months of running, which are planned for 2018. In this region of the parameter space, dark photons could account for the difference between the measurement of the anomalous magnetic moment of the muon (g-2)μ and the Standard Model prediction.
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