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Light weakly coupled axial forces: models, constraints, and projections
2017
Journal of High Energy Physics
We investigate the landscape of constraints on MeV-GeV scale, hidden U(1) forces with nonzero axial-vector couplings to Standard Model fermions. While the purely vector-coupled dark photon, which may arise from kinetic mixing, is a well-motivated scenario, several MeV-scale anomalies motivate a theory with axial couplings which can be UV-completed consistent with Standard Model gauge invariance. Moreover, existing constraints on dark photons depend on products of various combinations of axial
doi:10.1007/jhep05(2017)002
fatcat:imavlkgqlre5tazzxqil4dv3wi