Vector boson production at hadron colliders: hard-collinear coefficients   at the NNLO
  We consider QCD radiative corrections to vector-boson production in hadron collisions. We present the next-to-next-to-leading order (NNLO) result of the hard-collinear coefficient function for the all-order resummation of logarithmically-enhanced contributions at small transverse momenta. The coefficient function controls NNLO contributions in resummed calculations at full next-to-next-to-leading logarithmic accuracy. The same coefficient function is used in applications of the subtraction method to perform fully-exclusive perturbative calculations up to NNLO. 
S.Catani, L.Cieri, D. de Florian, G.Ferrera, M.Grazzini
hep-ph