Top anti-top quark spin correlations and the potential of observation of CP volation in the production vertex

Heavy quarks have special properties. The decay and production mechanism is mentioned. Large statistics of t-quarks can significantly contribute to understand the mass and properties of quarks. Also a possible new interactions in the strong vertex, involving supersymetric particles, several Higgs fields, may contribute to observable quantities. Such dynamics may be detected via asymmetry, which may reflect CP-violation in the strong production vertex. Some possibilities to study of this effects at the LHC energies in ATLAS experiment is subject of this note.