Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Theorie
HK 21.4: Talk
Tuesday, March 11, 2008, 09:30–09:45, 2F
Partonic off-shell effects and the Drell-Yan process — •Fabian Eichstaedt, Stefan Leupold, and Ulrich Mosel — Institut für Theoretische Physik, Universität Gießen
Lepton pair production in the Drell-Yan process can be described by
leading order perturbative QCD, however with limitations. The
dependence of the differential cross section on the mass of the lepton
pair and on the rapidity can only be reproduced with the help of a
K-factor and the pT-spectrum of the lepton pair is not accessible
in this way. In fact every finite order pQCD calculation leads to a
pT-spectrum which is divergent at pT → 0. Therefore we
propose a phenomenological approach which incorporates off-shell
quarks and show that we can account for the shortcomings of the pQCD
description in this model.
Work supported by DFG through the
European Graduate School “Complex Systems of Hadrons and Nuclei”.