γp and γγ scattering from pp, pp forward amplitudes in a QCD eikonal model with a dynamical gluon mass

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We examine the γp photoproduction and the hadronic γγ total cross sections by means of a QCD eikonal model with a dynamical infrared mass scale. In this model, where the dynamical gluon mass is the natural regulator for the tree level gluon-gluon scattering, the γp and γγ total cross sections are derived from the pp and pp forward scattering amplitudes assuming vector meson dominance and the additive quark model. We show that the validity of the cross section factorization relation σpp/σᵧₚ=σᵧₚ/σᵧᵧ is fulfilled depending on the Monte Carlo model used to unfold the hadronic γγ cross section data, and we discuss in detail the case of σ(γγ→ hadrons) data with Wᵧᵧ > 10 GeV unfolded by the Monte Carlo generators PYTHIA and PHOJET. The data seems to favor a mild dependence with the energy of the probability (Phad) that the photon interacts as a hadron.