Baryon resonances in the mean field approach and a simple explanation of the Theta+ pentaquark

Details Baryon resonances in the mean field approach and a simple explanation of the Theta+ pentaquark Baryon resonances in the mean field approach and a simple explanation of the Theta+ pentaquark

2008-12-17

arxiv.org/abs/0812.3418v1

JETP Lett.90:407-411,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 p., 5 figs

Scientific paper

10.1134/S0021364009180015

We suggest to classify baryon resonances as single-quark states in a mean field, and/or as its collective excitations. Identifying the Roper resonance N(1440), the nucleon resonance N(1535), and the singlet hyperon Lambda(1405) as single-quark excitations, we find that there must be an exotic S=+1 baryon resonance Theta+ (the "pentaquark") with a mass about 1440+1535-1405=1570 MeV and spin-parity one-half-plus. We argue that Theta+ is an analog of the Gamov--Teller excitation long known in nuclear physics.

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