  Forward-backward asymmetries $A_{FB}^t$ and $A_{FB}^\ell$ are observed in the
top quark $t$ rapidity distribution and in the rapidity distribution of charged
leptons $\ell$ from top quark decay at the Tevatron proton-antiproton collider,
and a charge asymmetry $A_C$ is seen in proton-proton collisions at the Large
Hadron Collider (LHC). In this paper, we update our previous studies of the
Tevatron asymmetries using the most recent data. We provide expectations for
$A_C$ at the LHC based first on model independent extrapolations from the
Tevatron, and second based on new physics models that can explain the Tevatron
asymmetries. We examine the relationship of the two asymmetries $A_{FB}^t$ and
$A_{FB}^\ell$. We show their connection through the $(V-A)$ spin correlation
between the charged lepton and the top quark with different polarization
states. We show that the ratio of the two asymmetries provides independent
insight into new physics models that are invoked to fit the top quark
asymmetry. We emphasize the value of the measurement of both asymmetries, and
we conclude that a model which produces more right-handed than left-handed top
quarks is favored by the present Tevatron data.

High Energy Physics - Phenomenology;High Energy Physics - Experiment