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.
Highlights
The existence of dark matter is one of the most important motivators for new physics scenarios
We investigate the implications of the dark axion portal interaction, the axion-photon-dark photon vertex, for the future experiments search for hidden particles (SHiP) and forward search experiment (FASER)
We study the phenomenology of the combined vector portal and dark axion portal
Summary
The existence of dark matter is one of the most important motivators for new physics scenarios. The primary purposes of this paper are (i) to study the implications of the dark axion portal for the future experiments SHiP and FASER, and (ii) to explore new channels that become available when we consider both the vector portal and the dark axion portal. For the latter, we discuss whether the 3.5σ level muon g − 2 anomaly [1] can be explained in the presence of the two portals, and point out substantial advantages in exploring the combined dark sector if monophoton searches can be implemented in beam dump experiments.
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