Measurement of spin correlation in ttbar production using a matrix element approach

Collaboration, D0 and Bertram, Iain and Borissov, Guennadi and Fox, Harald and Ross, Anthony and Williams, Mark and Ratoff, Peter (2011) Measurement of spin correlation in ttbar production using a matrix element approach. Physical review letters, 107 (3). ISSN 1079-7114

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correlation, assuming that the spin of the top quark is either correlated with the spin of the anti-top quark as predicted by the standard model or is uncorrelated. For the first time we use a matrix-element-based approach to study ttbar spin correlation. We use {ttbar -> W+bW-bbar ->l+nubl-nub} final states produced in ppbar collisions at a center of mass energy sqrt(s)=1.96 TeV, where l denotes an electron or a muon. The data correspond to an integrated luminosity of 5.4 fb-1 and were collected with the dzero detector at the Fermilab Tevatron collider. The result agrees with the standard model prediction. We exclude the hypothesis that the spins of the ttbar are uncorrelated at the 97.7% C.L.

Item Type: Journal Article
Journal or Publication Title: Physical review letters
Additional Information: © 2011 American Physical Society 7 pages, 3 figures, submitted to Phys. Rev. Lett
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Departments: Faculty of Science and Technology > Physics
ID Code: 63674
Deposited By: ep_importer_pure
Deposited On: 24 Apr 2013 10:34
Refereed?: Yes
Published?: Published
Last Modified: 20 Feb 2020 01:44

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