Measurement of spin correlation in ttbar production using dilepton final states

Details Measurement of spin correlation in ttbar production using dilepton final states Measurement of spin correlation in ttbar production using dilepton final states

2011-03-09

arxiv.org/abs/1103.1871v1

Phys.Lett.B702:16-23,2011

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 3 figures, submitted to PLB

Scientific paper

10.1016/j.physletb.2011.05.077

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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