Born amplitudes in QCD from scalar diagrams
  We review recent developments for the calculation of Born amplitudes in QCD. This includes the computation of gluon helicity amplitudes from MHV vertices and an approach based on scalar propagators and a set of three- and four-valent vertices. The latter easily generalizes to amplitudes with any number of quark pairs. The quarks may be massless or massive. 
Christian Schwinn (RWTH Aachen), Stefan Weinzierl (Mainz University)