One-Loop Amplitudes for Multi-Jet Production at Hadron Colliders
  We present a numerical implementation for virtual corrections to multi-jet production at Next-to-Leading order. Using the algorithm of generalised unitarity we compute primitive amplitudes from tree-level input. These basic ingredients are then used to compute full colour and helicity summed corrections. 
Simon Badger, Benedikt Biedermann, Peter Uwer
hep-ph