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Measurement of spin correlation in ttbar production using dilepton final states

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>3/07/2011
<mark>Journal</mark>Physics Letters B
Number of pages8
<mark>Original language</mark>English


We measure the correlation between the spin of the top quark and the spin of the anti-top quark in (ttbar -> W+ W- b bbar -> l+ nu b l- nubar bbar) final states produced in ppbar collisions at a center of mass energy sqrt(s)=1.96 TeV, where l is an electron or muon. The data correspond to an integrated luminosity of 5.4 fb-1 and were collected with the D0 detector at the Fermilab Tevatron collider. The correlation is extracted from the angles of the two leptons in the t and tbar rest frames, yielding a correlation strength C= 0.10^{+0.45}_{-0.45}, in agreement with the NLO QCD prediction within two standard deviations, but also in agreement with the no correlation hypothesis.

Bibliographic note

10 pages, 3 figures, submitted to PLB