Quarkonium+γ production in coherent hadron–hadron interactions at LHC energies V.P. Gonçalves and M.M. Machado Eur. Phys. J. C, 72 11 (2012) 2231 Published online: 16 November 2012 DOI: 10.1140/epjc/s10052-012-2231-7