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A detailed study of top-quark polarizations and $t \bar t$ chargeasymmetries, induced by top-squark-pair production at the LHC and thesubsequent decays $\tilde t \to t \tilde \chi_1^0$, is performed within theeffective description of squark interactions, which includes the effectiveYukawa couplings and another logarithmic term encoding the supersymmetrybreaking. This effective approach is more suitable for its introduction intoMonte-Carlo simulations and we make use of its implementation in {\tt MadGraph}in order to investigate the possibilities of the charge asymmetry $A_\text{C}$,measured at the LHC and consistent with SM expectations, to discriminate amongdifferent SUSY scenarios and analyze the implications of these scenarios in thetop polarizations and related observables.

Top-quark Polarization and Asymmetries at the LHC in the Effective Description of Squark Interactions