Measurement of Spin Correlation in tt¯ Production Using a Matrix Element Approach

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. Lett. 107, 032001 – Published 14 July 2011

Abstract

We determine the fraction of tt¯ events with spin correlation, assuming that the spin of the top quark is either correlated with the spin of the top antiquark as predicted by the standard model or is uncorrelated. For the first time we use a matrix-element-based approach to study tt¯ spin correlation. We use tt¯W+bWb¯+νbν¯b¯ final states produced in pp¯ collisions at a center-of-mass energy s=1.96TeV, where denotes an electron or a muon. The data correspond to an integrated luminosity of 5.4fb1 and were collected with the D0 detector at the Fermilab Tevatron collider. The result agrees with the standard model prediction. We exclude the hypothesis that the spins of the tt¯ are uncorrelated at the 97.7% C.L.

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  • Received 27 April 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.032001

© 2011 American Physical Society

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Vol. 107, Iss. 3 — 15 July 2011

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