We examine HERA data with a view of determining whether unique signs of saturation can be identified. Concentrating on two channels the logarithmic slope of $F_{ 2}$, and the production of $J/\Psi$, which are sensitive to the behaviour of $xG(x,Q^{ 2})$ the gluon density distribution in the proton, we show that our model incorporating screening corrections and alternative models comprising a sum of a "soft" and "hard" component provide good fits to the data.
Categories: hep-ph