A Z-monitor to calibrate Higgs production via vector boson fusion with rapidity gaps at the LHC V.A. Khoze, M.G. Ryskin, W.J. Stirling and P.H. Williams Eur. Phys. J. C, 26 3 (2003) 429-440 Published online: 31 October 2002 DOI: 10.1140/epjc/s2002-01069-2