ATLAS sensitivity to CP violating g-t-t couplings.

The level of CP violation in top quark events induced by the Standard Model is known to be beyond the experimental sensitivity by many orders of magnitude. However, within the language of effective theories, it is plausible that new CP violating physics could reveal itself as additional non renormalizable terms in the Lagrangian. Since these should respect the symmetries of the low energy gauge interaction, violate CP and generate the correct event topology, the set of allowed terms is highly restricted. This analysis gives an estimation of the ATLAS sensitivity to the lowest order effective CP violating g-t-t interaction term beyond the standard model.