# Evidence for spin correlation in ttbar production

D0 Collaboration, The and Bertram, Iain and Borissov, Guennadi and Fox, Harald and Ross, Anthony and Williams, Mark and Ratoff, Peter (2012) Evidence for spin correlation in ttbar production. Physical review letters, 108 (3). ISSN 1079-7114

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PhysRevLett.108.032004.pdf - Published Version

## 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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
© 2012 American Physical Society 7 pages, 2 figures
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments:
ID Code:
63573
Deposited By:
Deposited On:
24 Apr 2013 08:25
Refereed?:
Yes
Published?:
Published