Collider searches for heavy neutral leptons: beyond simplified scenarios Asmaa Abada, Pablo Escribano, Xabier Marcano and Gioacchino Piazza Eur. Phys. J. C, 82 11 (2022) 1030 Published online: 15 November 2022 DOI: 10.1140/epjc/s10052-022-11011-7