Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 17: Elektromagnetische und hadronische Proben II

HK 17.2: Gruppenbericht

Dienstag, 18. März 2003, 16:00–16:30, B

Nucleon properties in the perturbative chiral quark model — •Thomas Gutsche, Valery Lyubovitskij, and Amand Faessler — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

We review applications of the perturbative chiral quark model (PCQM) to analyze low-energy properties of the nucleon: electromagnetic form factors [1], meson-nucleon sigma-terms [2], electromagnetic corrections to pion-nucleon scattering [3] and strangeness content of the nucleon [4]. 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 nucleon 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] V. E. Lyubovitskij, T. Gutsche and A. Faessler, Phys. Rev. C 64, 065203 (2001)

[2] V. E. Lyubovitskij, T. Gutsche, A. Faessler and E. G. Drukarev, Phys. Rev. D 63, 054026 (2001)

[3] V. E. Lyubovitskij, T. Gutsche, A. Faessler and R. Vinh Mau, Phys. Rev. C 65, 025202 (2002)

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