ISBN 978-3-8439-0243-4

978-3-8439-0243-4, Reihe Physik

Fabian Eichstädt
Description of Drell-Yan pair production in a phenomenological parton model

272 Seiten, Dissertation Justus-Liebig-Universität Gießen (2011), Softcover, A5

Zusammenfassung / Abstract

In this thesis we have studied fully differential DY pair production in proton and antiproton induced reactions. For this purpose we have developed a model which incorporates phenomenological distributions for the intrinsic transverse momentum of partons and for the masses of the quarks, as well as standard longitudinal PDFs.

First, we have presented certain mathematical tools which are of importance for this work. Afterwards, the relevant physical background for our model has been presented, especially with a focus on studies of the nucleon structure. Following that, we have introduced the DY process and presented our LO model for the description of the DY observables. Taking into account parton transverse momentum and quark mass distributions we have shown, that our LO model cannot satisfactorily reproduce the absolute strength of the measured DY pT and M spectra, i.e. a K factor is needed, just as in the standard parton model for the DY process. Therefore, we have subsequently extended our model by additionally taking into account all NLO processes of O(αs). We have found, that with our quark mass distributions we can effectively

overcome the problems of the standard O(αs) pQCD calculation with massless quarks. Finally we have presented our results and shown, that a K factor free description of measured DY spectra is possible in our full model. Based on these results we have presented predictions for DY pair production at low hadronic energies, relevant for the future PANDA experiment.