Scaling in ${\gamma }^{\ast }p$ total cross sections, saturation and the gluon density

D. Schildknecht, B. Surrow, M. Tentyukov

Including the new HERA data, the ${\gamma }^{\ast }p$ total cross section is analysed in the generalized vector dominance/colour-dipole picture (GVD/CDP) that contains scaling in $η= (Q^2 + m^2…