# Evidence for spin correlation in ttbar production

Abstract : We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00634051
Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, October 20, 2011 - 10:12:40 AM
Last modification on : Wednesday, September 16, 2020 - 4:20:31 PM

### Citation

V.M. Abazov, B. Abbott, B.S. Acharya, M. Adams, T. Adams, et al.. Evidence for spin correlation in ttbar production. Physical Review Letters, American Physical Society, 2012, 108, pp.032004. ⟨10.1103/PhysRevLett.108.032004⟩. ⟨in2p3-00634051⟩

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