title: Soft diffractive high energy scattering and form factors in nonperturbative QCD
creator: Paulus, Timo
subject: ddc-530
subject: 530 Physics
description: In this work we study soft high energy reactions in the framework of nonperturbative models. Using a functional integral approach we derive the scattering amplitudes, which are governed by expectation values of light-like Wegner-Wilson loops and lines, which then are then evaluated in the model of the stochastic vacuum. We describe mesons in a simple quark-antiquark picture, for baryons we assume a quark-diquark structure, as hadronic wave functions we apply a Wirbel-Stech-Bauer ansatz. In the following we calculate integrated and differential cross sections from the scattering amplitudes, as well for elastic and diffractive proton-proton as for proton-pion scattering at high centre of mass energies and small momentum transfers and compare to experimental data. Depending on the symmetry of the respective final state we get either C=P=+1 (pomeron) oder C=P=-1 (odderon) exchange. Furthermore we calculate the isovector form factors of the proton and the pion at space-like momentum transfers. In the final chapter we use a dispersion approach to calculate the pion form factor at time-like momentum transfers and determine the masses and coupling constants of the rho- and omega-mesons from a comparison to experimental data.
date: 2002
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/3084/1/diss.pdf
identifier: DOI:10.11588/heidok.00003084
identifier: urn:nbn:de:bsz:16-opus-30841
identifier:   Paulus, Timo  (2002) Soft diffractive high energy scattering and form factors in nonperturbative QCD.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/3084/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng