A gauged, flavor-specific U(1)_X two-Higgs-doublet model can realize the axial-vector Z' couplings needed to explain the ATOMKI 8Be and 4He anomalies while evading current bounds.
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MicroBooNE performs a blind search for anomalous single-photon events and finds agreement overall but a ~2σ excess in the proton-free subsample at energies below 600 MeV.
A minimal electrophilic ALP portal for SIMP pion dark matter widens the allowed parameter space, making an ALP mass of order 10 MeV viable and consistent with the X17 anomaly.
citing papers explorer
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Flavor specific chiral $U(1)_X$ framework for explaining the ATOMKI anomaly
A gauged, flavor-specific U(1)_X two-Higgs-doublet model can realize the axial-vector Z' couplings needed to explain the ATOMKI 8Be and 4He anomalies while evading current bounds.
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Inclusive Search for Anomalous Single-Photon Production in MicroBooNE
MicroBooNE performs a blind search for anomalous single-photon events and finds agreement overall but a ~2σ excess in the proton-free subsample at energies below 600 MeV.
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Axion-Like Electrophilic Portal for Pion Dark Matter
A minimal electrophilic ALP portal for SIMP pion dark matter widens the allowed parameter space, making an ALP mass of order 10 MeV viable and consistent with the X17 anomaly.