München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 30: Theorie

HK 30.7: Vortrag

Mittwoch, 22. März 2006, 15:30–15:45, B

On nucleon form factors in the Poincaré-covariant Faddeev approach to Landau gauge QCD — •Reinhard Alkofer, Gernot Eichmann, Markus Kloker, and Andreas Krassnigg — Institut für Physik, University of Graz, A-8010 Graz, Austria

In a Poincaré-covariant Faddeev approach to Landau gauge QCD the electromagnetic form factors of the nucleon have been calculated employing models for the quark propagators and the quark-quark t-matrix, see e.g. ref. [1]. In a next step the quark propagators whose analytic structure is determined from Landau gauge Dyson-Schwinger equations for gluons, ghosts and quarks as well as from lattice calculations [2] are employed. The quark-quark t-matrix is then obtained from a Bethe-Salpeter approach [3]. Numerical results within increasingly sophisticated approximations for the electromagnetic nucleon form factors, including an estimate of corresponding meson cloud contributions, are presented.

[1] R. Alkofer et al., Few Body Systems 37 (2005 1; A. Höll et al., Nucl. Phys. A755 (2005) 298.

[2] R. Alkofer et al., Phys. Rev. D70 (2004) 014014.

[3] P. Maris, Few Body Systems 35 (2004) 117 and references therein.