# Measurement of spin correlations in $t\overline{t}$ production using the matrix element method in the muon+jets final state in pp collisions at $\sqrt{s}$ = 8 TeV

CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Measurement of spin correlations in $t\overline{t}$ production using the matrix element method in the muon+jets final state in pp collisions at $\sqrt{s}$ = 8 TeV. Physics Letters B, 758:321-346.

## 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 19.7fb$^{−1}$. 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 muon+jets final state to date.

## 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 19.7fb$^{−1}$. 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 muon+jets final state to date.

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