====== TTP01-11 Next-to-leading order QCD corrections to top quark spin correlations at hadron colliders: the reactions $gg\to t \bar t (g)$ and $gq(\bar q) \to t\bar t q (\bar q)$ ======
 
 
   <hidden TTP01-11  Next-to-leading order QCD corrections to top quark spin correlations at hadron colliders: the reactions $gg\to t \bar t (g)$ and $gq(\bar q) \to t\bar t q (\bar q)$ > We have computed the cross section for $t\bar t$ production by gluon-gluon fusion at
     next-to-leading order (NLO) in the QCD coupling, keeping the full dependence on
     the $t\bar t$ spins. Furthermore we have determined to the same order the spin
     dependent cross sections for the processes $g + q ({\bar q})\to t {\bar t} + q ({\bar
     q})$. Together with our previous results for $q + {\bar q} \to t {\bar t} (g)$ these
     results allow for predictions, at NLO QCD, of the hadronic production of $t\bar t$
     pairs in a general spin configuration. As an application we have determined the degree
     of correlation of the $t$ and $\bar t$ spins at NLO, using various spin quantisation
     axes.
 </hidden>
|**W. Bernreuther, A. Brandenburg, Z.G. Si, and P. Uwer**  | 
|**  Phys.Lett.  B509 53-58 2001  **  |
| {{preprints:2001:ttp01-11.pdf|PDF}} {{preprints:2001:ttp01-11.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0104096|arXiv]]   |
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