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This Letter presents measurements of the polarization of the top quark intop-antitop quark pair events, using 4.7 fb^-1 of proton-proton collision datarecorded with the ATLAS detector at the Large Hadron Collider at sqrt(s) = 7TeV. Final states containing one or two isolated leptons (electrons or muons)and jets are considered. Two measurements of alpha_l P, the product of theleptonic spin-analyzing power and the top quark polarization, are performedassuming that the polarization is introduced by either a CP conserving (CPC) ora CP violating (CPV) production process. The measurements obtained, alpha_lP_CPC = -0.035 +/- 0.014 (stat) +/- 0.037 (syst) and alpha_l P_CPV = 0.020 +/-0.016 (stat) +0.013 -0.017 (syst), are in good agreement with the StandardModel prediction of negligible top quark polarization.

Measurement of top quark polarization in top-antitop events from proton-proton collisions at sqrt(s) = 7 TeV using the ATLAS detector