Abstract
The PADME experiment, at the Laboratori Nazionali di Frascati (LNF) of INFN will perform a search for the production of a low mass gauge boson A′ of a new U(1) symmetry, exploiting a novel positron-on-target-annihilation technique, e++e− → γ + A′. The DAΦNE linac will provide 550 MeV positrons directed towards a thin diamond target. The events reconstruction will employ a measurement of the energy and the direction of the recoil photon by a segmented crystal calorimeter, thus allowing the reconstruction of the A′ mass as the missing mass in the final state. A fine-grained plastic scintillator veto composed of three stations in vacuum will suppress the background due to bremsstrahlung emission and a fast Cerenkov detector will help with the multiphoton events rejection. PADME expects to reach sensitivity on the relative coupling strength (ϵ2 parameter) down to 10−6, in the mass region 1 MeV < MA′ < 22.5 MeV, for one year of data taking with a 550 MeV beam.
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