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We present a simultaneous measurement of the forward-backward asymmetry andthe top-quark polarization in $t\bar t$ production in dilepton final statesusing 9.7 fb$^{-1}$ of proton-antiproton collisions at $\sqrt{s}=1.96$ TeV withthe D0 detector. To reconstruct the distributions of kinematic observables weemploy a matrix element technique that calculates the likelihood of thepossible $t\bar t$ kinematic configurations. After accounting for the presenceof background events and for calibration effects, we obtain a forward-backwardasymmetry of $A^{t\bar t} = (15.0 \pm 6.4 \text{ (stat)} \pm 4.9 \text{(syst)})\%$ and a top-quark polarization times spin analyzing power in the beambasis of $\kappa P = (7.2 \pm 10.5 \text{ (stat)} \pm 4.2 \text{ (syst)})\%$,with a correlation of $-56\%$ between the measurements. If we constrain theforward-backward asymmetry to its expected standard model value, we obtain ameasurement of the top polarization of $\kappa P = (11.3 \pm 9.1 \text{ (stat)}\pm 1.9 \text{ (syst)})\%.$ If we constrain the top polarization to itsexpected standard model value, we measure a forward-backward asymmetry of$A^{t\bar t} = (17.5 \pm 5.6 \text{ (stat)} \pm 3.1 \text{ (syst)})\%.$ Acombination with the D0 $A^{t\bar t}$ measurement in the lepton+jets finalstate yields an asymmetry of $ A^{t\bar t} = (11.8 \pm 2.5 \text{ (stat)} \pm1.3 \text{ (syst)})\% . $ Within their respective uncertainties, all theseresults are consistent with the standard model expectations.

Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from $t\bar t$ production at the Tevatron