Abstract
We present a search for pair production of down-type heavy quarks (b'b̄'), single and pair production of heavy top quark partners (T5/3qq̄' and T5/3T̄5/3, respectively), and production of events containing four top quarks (ttt̄t) in pp collisions at = 7 TeV recorded with the ATLAS detector at the LHC. For an integrated luminosity of 4.7 fb−1, the corresponding lower limit on both the b' and T5/3 mass is 0.67 TeV at 95% confidence level, when produced in pairs. When including the single production mechanism, limits on T5/3 production are 0.68 TeV and 0.70 TeV for a coupling constant of the tWT5/3 vertex equal to 1 and 3, respectively. The upper limit on the four top quarks production cross section is 61 fb at 95% confidence level.
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