Inclusive J/ψ photoproduction and polarization at HERA in the k T -factorization approach S.P. Baranov, A.V. Lipatov and N.P. Zotov Eur. Phys. J. C, 71 4 (2011) 1631 Published online: 27 April 2011 DOI: 10.1140/epjc/s10052-011-1631-4