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Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

Spin correlation in ttbar production (D0)

Jul 5, 2012, 4:00 PM
Room 216 (Melbourne Convention and Exhibition Centre)

Room 216

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 4 - Top Quark Physics TR4 - Top Quark Physics


Dr Yvonne Peters (University of Göttingen & DESY)


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 and in events with two leptons (ee, emu, mumu) and at least two jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3-5.4 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 the results of the single lepton and 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.

Primary authors

Dr Yvonne Peters (University of Göttingen & DESY) Dr Yvonne Peters

Presentation materials