We present an overview of the measurements of $t\bar{ t}$ spin correlations in the CMS Collaboration. We present two analyses both in the dilepton channel using proton-proton collisions at $\sqrt{ s}\, =\, 7$ TeV based on an integrated luminosity of 5.0 fb$^{ -1}$. The spin correlations and polarization are measured using angular asymmetries. The results are consistent with unpolarized top quarks and Standard Model spin correlation. The second analysis sets a limit on the real part of the top-quark chromo-magnetic dipole moment of $-0.043\, <\, Re({ \hat{ \mu}}_{ t})\, <\, 0.117$ at $95\,%$ confidence level through the measured azimuthal angle difference between the two charged leptons from $t\bar{ t}$ production.
Categories: hep-ex