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We present measurements of lepton (l) angular distributions in ttbar -> W+ bW- b -> l+ nu b l- nubar bbar decays produced in ppbar collisions at acenter-of-mass energy of sqrt(s)=1.96TeV, where l is an electron or muon. Usingdata corresponding to an integrated luminosity of 5.4fb^-1, collected with theD0 detector at the Fermilab Collider, we find that the angular distributions ofl- relative to anti-protons and l+ relative to protons are in agreement witheach other. Combining the two distributions and correcting for detectoracceptance we obtain the forward-backward asymmetry A^l_FB = (5.8 +- 5.1(stat)+- 1.3(syst))%, compared to the standard model prediction of A^l_FB (predicted)= (4.7 +- 0.1)%. This result is further combined with the measurement based onthe analysis of the l+jets final state to obtain A^l_FB = (11.8 +- 3.2)%.Furthermore, we present a first study of the top-quark polarization.

Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production