Searches for Fourth Generation, Vector-like Quarks and Resonances with the ATLAS Detector

Université de Genève, Geneva, Switzerland

^a e-mail: snezana.nektarijevic@cern.ch

Published online: 26 November 2013

Abstract

A summary of the searches for heavy quarks and heavy bosons decaying to top-antitop pairs ($t\overline{t}+1$ resonances) with 14.3 fb⁻¹ of the proton-proton collisions data at √s = 8 TeV delivered by the LHC and recorded by the ATLAS detector is presented here. The searches for heavy quarks are performed in context of the chiral fourth generation and vector-like quarks. One of the searches is also sensitive to the production of four top quarks and positively-charged top quark pairs. The search for $t\overline{t}+1$ resonances is motivated by the narrow width topcolor leptophobic Z’ and broad width Kaluza-Klein gluon models.