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- Title
Baryon resonances in the mean field approach and a simple explanation of the Θ<sup>+</sup> pentaquark.
- Authors
Diakonov, D. I.
- Abstract
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, 1/2+), the nucleon resonance N(1535, 1/2−), and the singlet hyperon Λ(1405, 1/2−) as single-quark excitations, we find that there must be an exotic S = +1 baryon resonance Θ+ (the “pentaquark”) with a mass about 1440 + 1535 − 1405 = 1570 MeV and spin-parity 1/2+. We argue that Θ+ is an analog of the Gamov-Teller excitation long known in nuclear physics.
- Subjects
RESONANCE; COLLECTIVE excitations; BARYON resonance; NUCLEAR physics; EXCITON theory
- Publication
JETP Letters, 2009, Vol 90, Issue 6, p407
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364009180015