Spin correlations in top quark pair production at the Large Hadron Collider

Abstract: In this work we investigate the spin correlation effect of the interference between signal and irreducible background events present in top quark pair production at the LHC at LO in the dilepton channel. To simulate the high energy proton-proton collisions of the LHC, MadGraph5_aMC@NLO framework is used as an event generator. The spin correlations are explicitly measured via the lepton kinematics and analyzed through the spin-density formalism. Moreover, we also study the leptonic angular distributions. We find that there is a measurable effect on the spin correlations of top quark pairs from the interference between signal and irreducible background events present in top quark pair production on the order of percent level, but that there is no measurable difference for the leptonic angular distributions.