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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Theorie
HK 42.3: Vortrag
Donnerstag, 15. März 2007, 11:45–12:00, C
Collective Resonances in the Soliton Model Approach to Meson–Baryon Scattering and Pentaquark Widths — •Herbert Weigel and Hans Walliser — Fachbereich Physik, Universität Siegen, 57068 Siegen
The proper description of hadronic decays of baryon resonances has been a long standing problem in soliton models for baryons. Here we present a solution to this problem in the three flavor Skyrme model that satisfies the large–NC consistency conditions [1,2]. As an application we discuss hadronic pentaquark decays and show that predictions based on axial current matrix elements are erroneous [1,2]. This puts serious doubts on the predictions of very narrow pentaquark resonances (decay width of only a few MeV) in all chiral soliton models. Though not free of model dependences, our prediction for the width of the Θ+ pentaquark in the Skyrme model is at about 50MeV; i.e. a typical hadronic scale [1,2].
[1] H. Walliser and H. Weigel,
Eur. Phys. J. A26 (2005) 361.
[2] H. Weigel, hep-ph/0610123,
Eur. Phys. J. A in print.