Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-02-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
Doctoral Thesis (Dissertation), Advisor: H. J. Pirner, J. Huefner, HD-THEP-03-09, 127pp
Scientific paper
We develop a model to compute high-energy reactions of hadrons and photons. The perturbative interaction is described by gluon exchange and the non-perturbative interaction by the stochastic vacuum model which leads to quark-confinement in dipoles via a string of color fields. We study the QCD structure of the dipole-dipole scattering in momentum space focussing especially on interactions between strings. We represent the string as a collection of stringless dipoles, show confinement effects in high-energy scattering and calculate unintegrated gluon distributions of hadrons and photons. In the impact parameter space of the scattering process we investigate the unitarity limit of the S-matrix. We calculate the impact parameter profiles for proton-proton and photon-proton scattering, determine the energy values at which the profiles saturate at the black disc limit, estimate the impact parameter dependent gluon distribution of the proton and discuss gluon saturation. We compare the model results for p p, pi p, K p, gamma p and gamma gamma reactions with experimental data and identify saturation effects in experimental observables.
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