Two-photon cross-sections from the saturation model
J. Kwiecinski, L. Motyka, N. Timneanu
Abstract
A saturation model for the total gamma-gamma and gamma*-gamma* cross-sections and for the real photon structure function F2gamma(x,Q2) is described. The model is based on a QCD dipole picture of high energy scattering. The two-dipole cross-section is assumed to satisfy the saturation property with the saturation radius taken from the GBW analysis of the gamma*-p interaction at HERA. The model is combined with the QPM and non-pomeron reggeon contributions an it gives a very good description of the data on the gamma-gamma total cross-section, on the photon structure function F2gamma(x,Q2) at low x and on the gamma*-gamma* cross-section. Production of heavy quarks in gamma-gamma collisions is also studied.
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