X17 discovery potential in the γN → e + e − N process at electron scattering facilities
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We propose a direct search for the X17 particle, which was conjectured to explain the ATOMKI 8 Be and 4 He anomalies, through the dilepton photoproduction process on a nucleon in the photon energy range below or around the pion production threshold. For the scenarios of either pseudoscalar, vector, or axial-vector quantum numbers of the conjectured X17, we use existing constraints to estimate the X17 signal process. For dilepton invariant mass resolutions which have been achieved in previous experiments, a signal-to-background ratio of up to an order of magnitude is found for a neutron target, and, in particular, for the pseudoscalar and vector X17 scenarios.
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Physical Review Letters, 128, American Physical Society, College Park, Md, 2022, https://doi.org/10.1103/physrevlett.128.091802