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The consistency of the spin correlation strength in top quark pair productionwith the standard model (SM) prediction is tested in the muon + jets finalstate. The events are selected from pp collisions, collected by the CMSdetector, at a centre-of-mass energy of 8 TeV, corresponding to an integratedluminosity of 19.7 inverse femtobarns. The data are compared with theexpectation for the spin correlation predicted by the SM and with theexpectation of no correlation. Using a template fit method, the fraction ofevents that show SM spin correlations is measured to be 0.72 +/- 0.08 (stat)+0.15 -0.13 (syst), representing the most precise measurement of this quantityin the lepton + jets final state to date.

physics letters b

Measurement of spin correlations in t t-bar production using the matrix  element method in the muon + jets final state in pp collisions at sqrt(s) = 8  TeV