Abstract
This chapter presents results at next-to-leading order (NLO) QCD for the hadronic production and decay of top quark pairs, taking into account t ¯ spin correlations. The t ¯ spin correlations are large effects that can be studied at the Tevatron and the Large Hadron Collider by measuring double angular distributions both in the dilepton and single lepton decay channels. The QCD corrections to these distributions have been computed and are under control. Spin correlations are suited to analyze in detail top quark interactions, search for new effects, and help to constrain the parton content of the proton. The calculation of the distribution at NLO QCD simplifies enormously in the leading pole approximation (LPA), which amounts to expanding the full amplitudes for around the complex poles of the t and t ¯ propagators. Within the LPA, the radiative corrections can be classified into factorizable and nonfactorizable contributions.
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