Measurements of $t\bar{t}$ spin correlations in CMS

Abstract

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.

4 pages, 6 figures, Proceedings of TOP2014, 7th International Workshop on Top Quark Physics, Cannes, France, September 29 - October 3 2014

References in corpus (1)

• Distributions and correlations for top quark pair production and decay at the Tevatron and LHC.