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Marsicano, L; Battaglieri, M; Bondí, M; Carvajal, C D R; Celentano, A; De Napoli, M; De Vita, R; Nardi, E; Raggi, M; Valente, P
Physical review letters, 2018-Jul-27, Volume: 121, Issue: 4Journal Article
A novel mechanism to produce and detect light dark matter in experiments making use of GeV electrons (and positrons) impinging on a thick target (beam dump) is proposed. The positron-rich environment produced by the electromagnetic shower allows us to produce an A^{'} via nonresonant (e^{+}+e^{-}→γ+A^{'}) and resonant (e^{+}+e^{-}→A^{'}) annihilation on atomic electrons. The latter mechanism, for some selected kinematics, results in a larger sensitivity with respect to limits derived by the commonly used A^{'}-strahlung. This idea, applied to beam-dump experiments and active beam-dump experiments, pushes down the current limits by an order of magnitude.
