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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The ratio of low-mass Z' to SM Z contributions to PNC in hydrogen and deuterium is computed for arbitrary Z' mass, showing faster-than-1/Z² growth at low Z for both nuclear-spin-independent and dependent cases.
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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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Parity Nonconservation in Hydrogen Induced by Low-Mass Vector-Boson Exchange
The ratio of low-mass Z' to SM Z contributions to PNC in hydrogen and deuterium is computed for arbitrary Z' mass, showing faster-than-1/Z² growth at low Z for both nuclear-spin-independent and dependent cases.