Is it a Standard Model Top
•Does the cross-section agree with QCD?
•Does the mass agree with SM
•Are decays as expected?  Count e, m,t, jets, b-jets.
•Check kinematics: pT & angular distributions
Run II
Error
QCD: a precise prediction for a change because it is calculable!!
Distinguish predictions
New physics:  top been produced in non standard way; top decaying non standard