M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B. Ali, K. Augsten, D. Caforio, M. Havránek, Z. Hubáček, P. Jačka et al.: Search for light long-lived neutral particles produced in pp collisions at root s=13 TeV and decaying into collimated leptons or light hadrons with the ATLAS detector. The European Physical Journal C 80(5), 450 (2020). doi:10.1140/epjc/s10052-020-7997-4