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Exotic baryons and monopole excitations in a chiral soliton model

Authors:	Email author" target="_blank">H?Weigel Email author

Institution:	(1) Fachbereich Physik, Siegen University, Walter-Flex-Straße 3, D-57068 Siegen, Germany

Abstract:	We compute the spectra of exotic pentaquarks and monopole excitations of thelow-lying $\frac{1}{2}^ +$ and $\frac{3}{2}^ +$ baryons in a chiral soliton model. Once the low-lying baryon properties are fit, the other states are predicted without any more adjustable parameters. This approach naturally leads to a scenario in which the mass spectrum of the next to lowest-lying $J^\pi = \frac{1}{2}^ +$ states is fairly well approximatedby the ideal mixing pattern of the $\mathbf{8}\oplus\overline{\mathbf{10}}$ representation of flavor SU(3). We compare our results to predictions obtained in other pictures for pentaquarks and speculate about the spin-parity assignment for $\Xi(1690)$ and $\Xi(1950)$ .Received: 21 April 2004, Revised: 19 May 2004, Published online: 23 July 2004PACS: 12.39.Dc Skyrmions - 14.20.-c Baryons (including antiparticles) - 14.80.-j Other particles (including hypothetical)

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