Single top quark production and decay at next-to-leading order in hadron collisions

We present a calculation of the next-to-leading-order QCD corrections, with the one-scale phase space slicing method, to single top quark production and decay process p (p) over bar, pp -> t (b) over bar + X -> bl nu(b) over bar + X at hadron colliders. Using the helicity amplitude method, the angular correlation of the final state partons and the spin correlation of the top quark are preserved. The effect of the top quark width is also examined.