Implications of the dark axion portal for SHiP and FASER and the advantages of monophoton signals

Abstract

We investigate the implications of the dark axion portal interaction, the axion-photon-dark photon vertex, for the future experiments SHiP and FASER. We also study the phenomenology of the combined vector portal (kinetic mixing of the photon and dark photon) and dark axion portal. The muon $g-2$ discrepancy is unfortunately not solved even with the two portals, but the low-energy beam dump experiments with monophoton detection capability can open new opportunities in light dark sector searches using the combined portals.

arXiv comment11 pages, 8 figures. v2 added an additional reference. v3 version published in Phys. Rev. D. Added discussion of MATHUSLA, REDTOP and NA62

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• Implication of the dark axion portal for the EDM of fermions and dark matter probing with NA64$e$, NA64$\mu$, LDMX, $\mbox{M}^3$, and BaBar
• New searches at the reactor experiments based on the dark axion portal
• Extending the Discovery Potential for Inelastic-Dipole Dark Matter with FASER
• Probing some photon portals to new physics at intensity frontier experiments
• Searching for Axino-Like Particle at Fixed Target Experiments
• Dark axion portal at $Z$ boson factories
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• The Forward Physics Facility at the High-Luminosity LHC
• Exploring the dark axion portal in the LUXE-NPOD experiment