Bonn 2010 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 25: Gittereichtheorie I
T 25.7: Gruppenbericht
Montag, 15. März 2010, 18:15–18:35, HG XIII
A New Approach to the Gluon Structure Function — •Daniel Grünewald1,2, Hans-Jürgen Pirner1, and Ernst-Michael Ilgenfritz3 — 1Institut für theoretische Physik, Universität Heidelberg — 2Fraunhofer ITWM, Kaiserslautern — 3Institut für Physik, Humboldt-Universität zu Berlin
We calculate the gluon structure function of a color dipole in a new approach evaluating the matrix element of gluon field operators separated along a direction close to the light cone. As vacuum state in the pure glue sector, we use a variational ground state of the near-light-cone Hamiltonian. With a mean momentum fraction of the gluons fixed to the "experimental value" in a proton, the resulting gluon structure function for a dipole state with four links is rather close to the NLO MRST 2002 and the CTEQAB-0 parameterizations at Q2=1.5 GeV2.