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HK: Physik der Hadronen und Kerne

HK 19: Theorie

HK 19.1: Group Report

Monday, March 7, 2005, 14:00–14:30, TU MA005

Baryon properties in the perturbative chiral quark model — •Thomas Gutsche, V. E. Lyubovitskij und Amand Faessler — Institut für Theoretische Physik, Universität Tübingen, D-72076 Tübingen, Germany

We review recent applications of the perturbative chiral quark model (PCQM) to analyze low-energy properties of baryons: meson-nucleon sigma-terms [1], static strange characteristics of the nucleon [2] and the ground state baryon spectrum [3] among others. The PCQM is based on an effective Lagrangian, where baryons are described by relativistic valence quarks and a perturbative cloud of Goldstone bosons as required by chiral symmetry. Analytical expressions for baryon observables are obtained in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, axial nucleon coupling constant, strong pion-nucleon form factor) and of only one model parameter (radius of the nucleonic three-quark core).

[1] T. Inoue, V. E. Lyubovitskij, T. Gutsche and A. Faessler, Phys. Rev. C 69 (2004) 035207

[2] V. E. Lyubovitskij, P. Wang, T. Gutsche and A. Faessler, Phys. Rev. C 66 (2002) 055204

[3] T. Inoue, V. E. Lyubovitskij, T. Gutsche and A. Faessler, arXiv:hep-ph/0404051