2011

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

D0 Collaboration, Abazov, V.

Understand

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.

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The pseudorapidity η \eta of a particle is defined as function of the polar angle θ \theta as η ⁡ ( θ ) = − ln ⁡ [ tan ⁡ ( θ / 2 ) ] \eta(\theta)=-\ln[\tan(\theta/2)] . We use here detector η \eta ( η det \eta_{\text{det}} ) which is defined with respect to the center of the detector
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