Abstract
We investigate spin properties of single top quark production at hadron colliders. Based on an analogy with single top production and polarized top quark decay, we reproduce in a simple way the results by G. Mahlon and S. Parke on the existence of preferred axes for the decomposition of the top quark spin. For the W∗- and W-g-fusion production modes these axes are related to the down-type quark momentum. The proposed method allows finding kinematical conditions for the observation of top quark polarization in a third process that contributes to single top production and is important at LHC energies, the tW-process, in which spin effects are smeared out by the contribution of diagrams with a QCD gtt̄-vertex. A simple Monte Carlo analysis of spin correlations for the tW-process with subsequent top decay is given as an illustration.
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