Axial-vector and scalar contributions to hadronic light-by-light scattering Gernot Eichmann, Christian S. Fischer, Tim Haeuser and Oliver Regenfelder Eur. Phys. J. C, 85 4 (2025) 445 Published online: 22 April 2025 DOI: 10.1140/epjc/s10052-025-14055-7