An Impact Parameter Dipole Saturation Model

الأصل · EN

We develop a dipole model for HERA DIS data which incorporates the impact parameter distribution of the proton. The model describes the inclusive total γ*p cross-sections as well as the diffractive J/ψ differential cross-sections. We compare the model with previous approaches and show that the t-distributions are sensitive to saturation phenomena. We estimate the boundary of the saturation region and show that it dominates the data in the low-Q² region where the total γ*p cross-section exhibits the same universal rise as hadronic cross-sections. The model is then extended to nuclei and shows good agreement with the nuclear shadowing data at small-x. Finally, we estimate the saturation scale in nuclei.