G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, K. Augsten, D. Caforio, P. Gallus, J. Guenther, J. Jakůbek et al.: Search for massive, long-lived particles using multitrack displaced vertices or displaced lepton pairs in pp collisions at root s=8 TeV with the ATLAS detector. Physical Review D 92(7), 072004 (2015). doi:10.1103/PhysRevD.92.072004