We present a measurement of the correlation between the spins of t and ¯t quarks produced in proton–antiproton collisions at the Tevatron Collider at a center-of-mass energy of 1.96TeV. We apply a matrix element technique to dilepton and single-lepton+jets final states in data accumulated with the D0 detector that correspond to an integrated luminosity of 9.7 fb−1. The measured value of the correlation coefficient in the off-diagonal basis, Ooff = 0.89 ± 0.22 (stat + syst), is in agreement with the standard model prediction, and represents evidence for a top–antitop quark spin correlation difference from zero at a level of 4.2 standard deviations.
Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., ... & Atkins, S. (2016). Measurement of spin correlation between top and antitop quarks produced in p (p) over-bar collisions at root s= 1.96 TeV.
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