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arxiv: 1103.1871 · v1 · pith:CN7D2PVTnew · submitted 2011-03-09 · ✦ hep-ex

Measurement of spin correlation in ttbar production using dilepton final states

classification ✦ hep-ex
keywords correlationspinagreementbbarfinalquarkstatesttbar
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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.

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