# Measurement of spin correlation between top and antitop quarks produced in p(p)over-bar collisions at root s=1.96 TeV

Abazov, VM, Abbott, B, Acharya, BS, Adams, M, Adams, T, Agnew, JP, Alexeev, GD, Alkhazov, G, Alton, A, Askew, A
et al (show 362 more authors) (2016) Measurement of spin correlation between top and antitop quarks produced in p(p)over-bar collisions at root s=1.96 TeV. PHYSICS LETTERS B, 757. pp. 199-206.

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## Abstract

We present a measurement of the correlation between the spins of t and tbar quarks produced in proton-antiproton collisions at the Tevatron Collider at a center-of-mass energy of 1.96 TeV. 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, $O_{off} = 0.89 \pm 0.22$ (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.

Item Type: Article Published version hep-ex, hep-ex Symplectic Admin 15 Feb 2019 16:25 19 Jan 2023 01:03 10.1016/j.physletb.2016.03.053 https://doi.org/10.1016/j.physletb.2016.03.053 https://livrepository.liverpool.ac.uk/id/eprint/3032938