A. M. Sirunyan, A. Tumasyan, W. Adam, F. Ambrogi, B. Calpas et al.: Search for single production of a vector- like T quark decaying to a Z boson and a top quark in proton-proton collisions at root s=13 TeV. Physics Letters B 781, 574-600 (2018). doi:10.1016/j.physletb.2018.04.036