Integrability and MHV diagrams in N=4 supersymmetric Yang-Mills theory
  We apply MHV diagrams to the derivation of the one-loop dilatation operator of N=4 super Yang-Mills in the SO(6) sector. We find that in this approach the calculation reduces to the evaluation of a single MHV diagram in dimensional regularisation. This provides the first application of MHV diagrams to an off-shell quantity. We also discuss other applications of the method and future directions. 
Andreas Brandhuber, Brenda Penante, Gabriele Travaglini, Donovan Young
hep-th