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- W2880459324 abstract "High-energy positron annihilation is a viable mechanism to produce dark photons (${A}^{ensuremath{'}}$). This reaction plays a significant role in beam-dump experiments using multi-GeV electron beams on thick targets by enhancing the sensitivity to ${A}^{ensuremath{'}}$ production. The positrons produced by the electromagnetic shower can produce an ${A}^{ensuremath{'}}$ via nonresonant (${e}^{+}+{e}^{ensuremath{-}}ensuremath{rightarrow}ensuremath{gamma}+{A}^{ensuremath{'}}$) and resonant (${e}^{+}+{e}^{ensuremath{-}}ensuremath{rightarrow}{A}^{ensuremath{'}}$) annihilation on atomic electrons. For visible decays, the contribution of resonant annihilation results in a larger sensitivity with respect to limits derived by the commonly used ${A}^{ensuremath{'}}$-strahlung in certain kinematic regions. When included in the evaluation of the E137 beam-dump experiment reach, positron annihilation pushes the current limit on $ϵ$ downwards by a factor of 2 in the range $33text{ }text{ }mathrm{MeV}/{c}^{2}<{m}_{{A}^{ensuremath{'}}}<120text{ }text{ }mathrm{MeV}/{c}^{2}$." @default.
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- W2880459324 date "2018-07-26" @default.
- W2880459324 modified "2023-10-18" @default.
- W2880459324 title "Dark photon production through positron annihilation in beam-dump experiments" @default.
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- W2880459324 doi "https://doi.org/10.1103/physrevd.98.015031" @default.
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