Vector-boson production at hadron colliders: hard-collinear coefficients at the NNLO Stefano Catani, Leandro Cieri, Daniel Florian, Giancarlo Ferrera and Massimiliano Grazzini Eur. Phys. J. C, 72 11 (2012) 2195 Published online: 03 November 2012 DOI: 10.1140/epjc/s10052-012-2195-7