Probing the coupling at a Future Circular Collider in the electron-hadron mode J. Hernández-Sánchez, C. G. Honorato and S. Moretti Eur. Phys. J. C, 83 1 (2023) 77 Published online: 27 January 2023 DOI: 10.1140/epjc/s10052-023-11209-3