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A measurement of the top quark electric charge is carried out in the ATLASexperiment at the Large Hadron Collider using 2.05 fb-1 of data at acentre-of-mass energy of 7 TeV. In units of the elementary electric charge, thetop quark charge is determined to be 0.64 +- 0.02 (stat.) +- 0.08 (syst.) fromthe charges of the top quark decay products in single lepton ttbar candidateevents. This excludes models that propose a heavy quark of electric charge--4/3, instead of the Standard Model top quark, with a significance of morethan 8 sigma.

Measurement of the top quark charge in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector