  Spin correlations in the top quark-antiquark system and the polarization of
the top quark are measured using dilepton final states produced in pp
collisions at the LHC at sqrt(s) = 7 TeV. The data correspond to an integrated
luminosity of 5.0 inverse femtobarns collected with the CMS detector. The
measurements are performed using events with two oppositely charged leptons
(electrons or muons), a significant imbalance in transverse momentum, and two
or more jets, where at least one of the jets is identified as originating from
a b quark. The spin correlations and polarization are measured through
asymmetries in angular distributions of the two selected leptons, unfolded to
the parton level. All measurements are found to be in agreement with
predictions of the standard model.
