Higgs boson production at hadron colliders: hard-collinear coefficients at the NNLO Stefano Catani and Massimiliano Grazzini Eur. Phys. J. C, 72 5 (2012) 2013 Published online: 22 May 2012 DOI: 10.1140/epjc/s10052-012-2013-2