Measurement of Spin Correlations in Top Pair Events in the Dilepton Channels in pp Collisions at 7 TeV

5th International Workshop on Top Quark Physics

Höhle, Felix^1

III Inst. Phys., RWTH Aachen University, Germany^1

关键词: CMS detectors;    Correlation coefficient;    Dileptons;    Helicities;    Integrated luminosity;    Pp collisions;    Spin correlations;    The standard model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/452/1/012049/pdf
DOI  :  10.1088/1742-6596/452/1/012049

来源: IOP

【 摘 要 】

We present a measurement of the spin correlation of top-antitop-pair events produced in pp collisions at = 7 TeV. The data used by this analysis corresponds to an integrated luminosity of 5.0 fb-1 collected with the CMS detector at the LHC. The spin correlation in top-antitop-pair events is extracted from a fit to the angular distribution between the two selected leptons. In the helicity basis, the correlation coefficient is found to be = 0.24 0.02 0.08 and agrees with the Standard Model prediction.