We present a method to compute off-shell effects for processes involving
resonant particles at hadron colliders with the possibility to include
realistic cuts on the decay products. The method is based on an effective
theory approach to unstable particle production and, as an example, is applied
to t-channel single top production at the LHC.Comment: 6 pages, to appear in the proceedings of the 9th International
Symposium on Radiative Corrections (RADCOR 2009), October 25-30 2009, Ascona,
Switzerlan