Pseudoscalar Higgs boson production at hadron colliders in NNLO QCD
  We compute the total cross-section for direct production of the pseudoscalar Higgs boson in hadron collisions at next-to-next-to-leading order (NNLO) in perturbative QCD. The O(alpha_s^2) QCD corrections increase the NLO production cross-section by approximately 20-30 per cent. 
Charalampos Anastasiou and Kirill Melnikov