Bound-state versus collective-coordinate approaches in chiral soliton models and the width of the Θpentaquark
Fachbereich Physik, Siegen University, D-57068, Siegen, Germany
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Accepted: 2 December 2005
Published online: 25 January 2006
We thoroughly compare the bound-state and rigid-rotator approaches to three-flavored chiral solitons. We establish that these two approaches yield identical results for the baryon spectrum and kaon-nucleon S-matrix in the limit that the number of colors (NC) tends to infinity. After proper subtraction of the background phase shift the bound-state approach indeed exhibits a clear resonance behavior in the strangeness S = + 1 channel. We present a first dynamical calculation of the widths of the Θ+ and Θ* pentaquarks for finite NC in a chiral soliton model.
PACS: 12.39.Dc Skyrmions – / 13.30.Eg Hadronic decays – / 13.75.Jz Kaon-baryon interactions –
© Società Italiana di Fisica and Springer-Verlag, 2006