Top quark pair properties (spin correlations, charge asymmetry and complex final states) with the ATLAS detector

In proton-proton collisions at the Large Hadron Collider, pairs of top and antitop quarks are\nexpected to be mostly produced through gluon fusion, in contrast to production at the Tevatron,\nwhere quark annihilation dominates. Making use of the large number of top quark pairs,\nwe present ATLAS collaboration measurements of the spin correlation between top and antitop\nquarks as well as of the top quark charge asymmetry which constitute important tests of QCD and\nare sensitive to new physics. We also discuss top quark pair production in association with the\nStandard Model electro-weak gauge bosons.