Physics Letters B (Jul 2016)

Measurement of spin correlations in tt‾ production using the matrix element method in the muon+jets final state in pp collisions at s=8 TeV

  • V. Khachatryan,
  • A.M. Sirunyan,
  • A. Tumasyan

DOI
https://doi.org/10.1016/j.physletb.2016.05.005
Journal volume & issue
Vol. 758, no. C
pp. 321 – 346

Abstract

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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 fb−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)−0.13+0.15(syst), representing the most precise measurement of this quantity in the muon+jets final state to date.

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