  Effective field theories provide a model independent parametrization of the
physics beyond the SM if the new degrees of freedom are heavy and complement
thus the searches for resonances. In this talk, I will apply this method to the
top sector which is expected to play a special role in many BSM scenarios. I
will then show the effects of those dimension-six operators on cross-sections
and distributions at hadron colliders. Those results together with the present
data from the LHC and the Tevatron already constrain the parameter space
