  Recent experimental results from the CDF collaboration which study the top
forward-backward asymmetry have strengthened the case that new physics is
playing a role in t-tbar production. Here we propose a set of measurements,
built from the charged lepton kinematics in semileptonic and fully leptonic
t-tbar events, designed to further probe the underlying causes of this
asymmetry both at the Tevatron and at the LHC. Using a set of conservative
reference models we find that measurements of the charged lepton asymmetry, top
polarization, and t-tbar spin correlation can establish the existence of new
physics and distinguish between competing models both at the Tevatron and the
LHC. At the Tevatron, discrimination between models is possible at the three
sigma level. At the LHC, we demonstrate that a top forward-backward asymmetry
can be established at roughly three sigma in the first five inverse-femtobarns
of data, and show how competing explanations can be further disentangled.
