QCD radiation in the production of heavy colored particles at the LHC
  We present a study of effects of QCD radiation in the production of heavy colored states, employing inclusive multi-jet samples obtained by matching matrix elements and parton showers. We discuss several examples showing that matched samples are in general not only more accurate than a parton shower alone, but also often indispensable to make reliable predictions of beyond the Standard Model signals. 
Johan Alwall, Simon de Visscher, Fabio Maltoni