Search for pair produced fourth-generation up-type quarks in pp collisions at root s=7 TeV with a lepton in the final state (Physics Letters B, 2012)

(untitled) - Chatrchyan, S; Khachatryan, V; Sirunyan, A; Tumasyan, A; Adam, W; Aguilo, E; Bergauer, T; Dragicevic, M; Ero, J; Fabjan, C; Fried, M; Fruehwirth, R; et al.