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The PADME experiment, approved by INFN at the end of 2015, aims to search for missing mass signals in the annihilation of positrons on a thin fixed target produced by invisible decays of the dark photon. The detector construction will be completed by the end of 2017 to be ready to run in spring of 2018. The collaboration aims at collecting about 1013 positron on target by the end of 2018 to reach a sensitivity down to 1 × 10−3 on the coupling of A′ up to 23.7 MeV mass.