Pentaquark spectroscopy: exotic Theta baryons

Details Pentaquark spectroscopy: exotic Theta baryons Pentaquark spectroscopy: exotic Theta baryons

2004-05-20

arxiv.org/abs/hep-ph/0405195v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures, invited talk at Nuclear Physics, Large and Small, April 19-22, 2004, Hacienda Cocoyoc, Mexico, to be publi

Scientific paper

10.1063/1.1805936

We propose a collective stringlike model of pentaquarks with the geometry of an equilateral tetrahedron in which the four quarks are located at the four corners and the antiquark in its center. The nonplanar equilibrium configuration is a consequence of the permutation symmetry of the four quarks. In an application to the spectrum of exotic Theta baryons, we find that the ground state pentaquark has angular momentum and parity J(p)=1/2(-) and a small magnetic moment of 0.382 nuclear magnetons. The decay width is suppressed by the spatial overlap with the decay products.

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