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

## TL;DR

This paper explores how the dark axion portal affects future experiments like SHiP and FASER, highlighting the potential of monophoton signals in light dark sector searches despite not resolving the muon g-2 discrepancy.

## Contribution

It introduces the combined phenomenology of the dark axion portal and vector portal, emphasizing the advantages of monophoton signals in experimental searches.

## Key findings

- Dark axion portal impacts SHiP and FASER experiment sensitivities.
- Monophoton detection offers new opportunities for light dark sector searches.
- Muon g-2 discrepancy remains unresolved with these portals.

## 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.