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Measurement of Spin Correlations in $t\bar{t}$ Production using the Matrix Element Method in the Muon+Jets Final State in $pp$ Collisions at $\sqrt{s} =$ 8 TeV

The CMS collaboration
Phys.Lett.B 758 (2016) 321-346, 2016.

Abstract (data abstract)
The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon+jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 inverse-femtobarns. The data are compared with the expectation for the spin correlation predicted by the SM and with the expectation of no correlation. Using a template fit method, the fraction of events 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 quantity in the lepton+jets final state to date.

  • Table 1

    Data from Page 15 of preprint


    The result of the template fit of distributions for uncorrelated and SM-like correlated ttbar spins.

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