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Evidence for spin correlation in ttbar production

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Article number032004
<mark>Journal publication date</mark>19/01/2012
<mark>Journal</mark>Physical review letters
Issue number3
Number of pages7
Publication StatusPublished
<mark>Original language</mark>English


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.

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© 2012 American Physical Society 7 pages, 2 figures