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Low-lying qqqqq̄ states in the baryon spectrum

✍ Scribed by C. Helminen; D.O. Riska

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
221 KB
Volume
699
Category
Article
ISSN
0375-9474

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✦ Synopsis

The coupling to light mesons leads to large widths and shifts of the energy of the excited states in the baryon spectrum from the predictions of the constituent quark model with three valence quarks. This coupling may be modeled by admixtures of sea-quark qqq(q q) n configurations in the resonances. A schematic flavor-and spin-dependent interaction model, similar to the one which reproduces the low-lying part of the experimental baryon spectrum in the valence quark model, is shown to bring the lowest qqqq q states with L = 1 and positive parity below the states with L = 0. Because of the partial overlap with the corresponding qqq states this suggests that most of the lowlying states in the baryon-resonance spectrum have substantial qqqq q admixtures.

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