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Evidence for Spin Correlation in $t\bar{t}$ Production
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
2012 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 108, no 3, # 032004- p.Article in journal (Refereed) Published
Abstract [en]

We present a measurement of the ratio of events with correlated t and (t) over bar spins to the total number of t (t) over bar events. This ratio f is evaluated using a matrix-element-based approach in 729 t (t) over bar candidate events with a single lepton l (electron or muon) and at least four jets. The analyzed p (p) over bar collisions data correspond to an integrated luminosity of 5: 3 fb(-1) and were collected with the D0 detector at the Fermilab Tevatron collider operating at a center-of-mass energy root s = 1.96 TeV. Combining this result with a recent measurement of f in dileptonic final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in t (t) over bar events with a significance of more than 3 standard deviations.

Place, publisher, year, edition, pages
2012. Vol. 108, no 3, # 032004- p.
National Category
Subatomic Physics
Research subject
URN: urn:nbn:se:su:diva-74233DOI: 10.1103/PhysRevLett.108.032004ISI: 000299329100006OAI: diva2:507279
Swedish Research Council


Available from: 2012-03-02 Created: 2012-03-02 Last updated: 2012-12-05Bibliographically approved

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Åsman, Barbro
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