Employing Helicity Amplitudes for Resummation in SCET
  Helicity amplitudes are the fundamental ingredients of many QCD calculations for multi-leg processes. We describe how these can seamlessly be combined with resummation in Soft-Collinear Effective Theory (SCET), by constructing a helicity operator basis for which the Wilson coefficients are directly given in terms of color-ordered helicity amplitudes. This basis is crossing symmetric and has simple transformation properties under discrete symmetries. 
Ian Moult, Iain W. Stewart, Frank J. Tackmann, Wouter J. Waalewijn
hep-ph nucl-th