Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector