NNLO soft function for electroweak boson production at large transverse   momentum
  The soft function relevant for the production of an electroweak boson (photon, W, Z or H) with large transverse momentum at a hadron collider is computed at next-to-next-to-leading order. This is the first two-loop computation of a soft function involving three light-cone directions. With the result, the threshold resummation for these processes can now be performed at next-to-next-to-next-to-leading logarithmic accuracy. 
Thomas Becher, Guido Bell and Stefanie Marti
hep-ph