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| VOLUME 90 | ISSUE 6 |
PAGE 451
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| Baryon resonances in the mean field approach and a simple explanation of the Θ+ pentaquark
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D. I. Diakonov
Petersburg Nuclear Physics Institute RAS, 188300 Gatchina, Leningrad region, Russia
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PACS: 12.39.Ki, 14.20.Dh, 14.20.Jn
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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  , the nucleon resonance
 , and the singlet hyperon
 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
 . We argue that Θ+ is an analog of the
Gamov-Teller excitation long known in nuclear physics.
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