Phenomenology of the companion-axion model: photon couplingsZhe Chen, Archil Kobakhidze, Ciaran A. J. O’Hare, Zachary S. C. Picker and Giovanni PierobonEur. Phys. J. C, 82 10 (2022) 940DOI: https://doi.org/10.1140/epjc/s10052-022-10909-6