Diffractive photoproduction of Z 0 bosons in coherent interactions at CERN-LHC V. P. Gonçalves and M. V. T. Machado Eur. Phys. J. C, 61 2 (2009) 351 Published online: 08 April 2009 DOI: 10.1140/epjc/s10052-009-1009-z