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On-shell effective theory approach has been widely used in search of varioussupersymmetric signals, in particular, gluino/squark pairs with long cascadedecay chains in which complete matrix element calculations may encounterover-20 dimensional integrations. On the other hand, leptons from polarizedchargino decays may show significant boost or anti-boost effect in somescenarios and simulation without polarization information may underestimate oroverestimate the lepton $p_{T}$ cut efficiencies in the first place. We studythe polarization effects in supersymmetry searches of multi-jets plus leptonsfinal states. We find it justifiable for first two generations to only useon-shell effective theories. While for measurements related to third generationsquarks, for instance, polarization effect of charginos from stop may reducethe lepton $p_{T}$ cut efficiencies in cross section measurements by $25\%$when slepton contributions dominate in chargino decay or $W$ are on-shell. Thesignal is then underestimated if only on-shell effective theory approach istaken in simulation of signal and the real bound on squark/gluino should bemore stringent.

Is polarization effect visible in leptonic SUSY searches?