Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Poster-Sitzung: Elektromagnetische und hadronische Proben

HK 11.26: Poster

Dienstag, 18. März 2003, 13:30–15:30, Foyer

Axial form factor of the nucleon in the perturbative chiral quark model — •Khanchai Khosonthongkee, Valery Lyubovitskij, Thomas Gutsche, and Amand Faessler — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen

We apply the perturbative chiral quark model (PCQM) at one loop to analyze the axial form factor of the nucleon. This model is based on an effective Lagrangian, where baryons are described by relativistic valence quarks surrounded by a perturbative cloud of Goldstone bosons. We apply the formalism to obtain analytical expressions for the nucleon axial form factor, which is given in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, strong pion-nucleon form factor) and of only one model parameter (radius of the nucleonic three-quark core).