Schwinger displacement of the quark–gluon vertex A. C. Aguilar, M. N. Ferreira, D. Ibañez and J. Papavassiliou Eur. Phys. J. C, 83 10 (2023) 967 Published online: 26 October 2023 DOI: 10.1140/epjc/s10052-023-12103-8