|
Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2009, Volume 90, Issue 6, Pages 451–455
(Mi jetpl537)
|
|
|
|
This article is cited in 5 scientific papers (total in 5 papers)
FIELDS, PARTICLES, AND NUCLEI
Baryon resonances in the mean field approach and a simple explanation of the $\Theta^+$ pentaquark
D. I. Diakonov Petersburg Nuclear Physics Institute RAS
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 $N(1440,{\textstyle{\frac12}}^+)$, the nucleon resonance $N(1535,{\textstyle{\frac12}}^-)$, and the singlet hyperon $\Lambda(1405,{\textstyle{\frac12}}^-)$ 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 ${\textstyle{\frac12}}^+$. We argue that $\Theta^+\,$ is an analog of the Gamov–Teller excitation long known in nuclear physics.
Received: 10.08.2009
Citation:
D. I. Diakonov, “Baryon resonances in the mean field approach and a simple explanation of the $\Theta^+$ pentaquark”, Pis'ma v Zh. Èksper. Teoret. Fiz., 90:6 (2009), 451–455; JETP Letters, 90:6 (2009), 407–411
Linking options:
https://www.mathnet.ru/eng/jetpl537 https://www.mathnet.ru/eng/jetpl/v90/i6/p451
|
Statistics & downloads: |
Abstract page: | 192 | Full-text PDF : | 65 | References: | 41 |
|