  Measurements of the top quark-antiquark (t t-bar) spin correlations and the
top quark polarization are presented for t t-bar pairs produced in pp
collisions at sqrt(s) = 8 TeV. The data correspond to an integrated luminosity
of 19.5 inverse femtobarns collected with the CMS detector at the LHC. The
measurements are performed using events with two oppositely charged leptons
(electrons or muons) and two or more jets, where at least one of the jets is
identified as originating from a bottom quark. The spin correlations and
polarization are measured from the angular distributions of the two selected
leptons, both inclusively and differentially, with respect to the invariant
mass, rapidity, and transverse momentum of the t t-bar system. The measurements
are unfolded to the parton level and found to be in agreement with predictions
of the standard model. A search for new physics in the form of anomalous top
quark chromo moments is performed. No evidence of new physics is observed, and
exclusion limits on the real part of the chromo-magnetic dipole moment and the
imaginary part of the chromo-electric dipole moment are evaluated.
