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Fixed-target experiments are ideally suited for discovering new MeV--GeV mass U (1) gauge bosons through their kinetic mixing with the photon. In this paper, we identify the production and decay properties of new light gauge bosons that dictate fixed-target search strategies. We summarize existing limits and suggest five new experimental approaches that we anticipate can cover most of the natural parameter space, using currently operating GeV-energy beams and well-established detection methods. Such experiments are particularly timely in light of recent terrestrial and astrophysical anomalies (PAMELA, Fermi, DAMA/LIBRA, etc. ) consistent with dark matter charged under a new gauge force.
Bjorken et al. (Wed,) studied this question.
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