Helicity Amplitudes for ${\cal O}(\alpha_s)$ Production of $W^+ W^-,   W^\pm Z, Z Z, W^\pm \gamma,$ or $Z \gamma$ Pairs at Hadron Colliders
  We present the one-loop QCD corrections to the helicity amplitudes for the processes $q\qb \to W^+ W^-, Z Z, W^\pm Z, W^\pm \gamma$, or $Z \gamma$, including the subsequent decay of each massive vector boson into a pair of leptons. We also give the corresponding tree-level amplitudes with an additional gluon radiated off the quark line. Together, these amplitudes provide all the necessary input for the calculation of the next-to-leading order QCD corrections to the production of any electroweak vector boson pair at hadron colliders, including the full spin and decay angle correlations. 
L. Dixon, Z. Kunszt and A. Signer