Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Theorie

HK 21.4: Vortrag

Dienstag, 11. März 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 p_T-spectrum of the lepton pair is not accessible in this way. In fact every finite order pQCD calculation leads to a p_T-spectrum which is divergent at p_T → 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”.