Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 24: Electromagnetic and Hadronic Probes III
HK 24.3: Vortrag
Mittwoch, 10. März 2004, 11:30–11:45, B
Electromagnetic form factors of hyperons in a relativistic quark model — •Tim Van Cauteren1, Dirk Merten2, Tamara Corthals1, Stijn Janssen1, Bernard Metsch2, Herbert-R. Petry2, and Jan Ryckebusch1 — 1Ghent University, Dept. of Subatomic and Radiation Physics, Proeftuinstraat 86, B-9000, Gent, Belgium — 2Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, D-53115 Bonn, Germany
In describing meson electroproduction processes on the nucleon with isobar models, the implementation of electromagnetic (EM) and strong form factors constitutes one of the major sources of uncertainty. A relativistically covariant constituent quark model offers the opportunity to constrain some of the unknown form factors. Over the last decade, the Bonn group has developed a relativistic quark model and has calculated the EM form factors of nonstrange baryons. We have extended the model to the strange baryon sector. We present our form factor results for the ground-state hyperons and discuss their implementation into an isobar model for kaon electroproduction. The computed magnetic moments agree well with the experimental values and the magnetic form factors follow a dipole Q2 dependence.
References : 1 T. Van Cauteren et al., nucl-th/0310058. 2 D. Merten et al., Eur. Phys. J. A14, 477 (2002). 3 U. Löring et al., Eur. Phys. J. A10, 309 (2001).