Inelastic J/ψ production at HERA

Inelastic J/ψ photoproduction is an interesting area where one can test QCD predictions. This article reviews the recent experimental results obtained by the ZEUS and H1 Collaborations. Single differential and double differential cross sections have been measured by the H1 Collaboration using an integrated luminosity of 166 pb −1 , taken in the years 2006-2007. The J/ψ decay angular distributions have been measured in inelastic photoproduction by the ZEUS Collaboration, with an integrated luminosity of 468 pb −1. These results have an increased precision compared to previous analyses. The measurements are compared to various theoretical predictions at leading and next-to-leading order in QCD.