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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2004, Volume 80, Issue 6, Pages 439–441
(Mi jetpl2118)
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This article is cited in 27 scientific papers (total in 27 papers)
FIELDS, PARTICLES, AND NUCLEI
Pentaquark decay is suppressed by chirality conservation
B. L. Ioffe, A. G. Oganesian Institute for Theoretical and Experimental Physics, 117218 Moscow, Russia
Abstract:
It is shown, that if the pentaquark $\Theta^+ = uudd\bar{s}$ baryon can be represented by the local quark current $\eta_{\Theta}$, its decay $\Theta^+ \to n K^+ (p K^0)$ is forbidden in the limit of chirality conservation. The $\Theta^+$decay width $\Gamma$ is proportional to $\alpha^2_s \langle 0 \vert \bar{q} q \vert 0 \rangle^2$, where $\langle 0 \vert \bar{q} q \vert 0 \rangle$, $q = u,d,s$ is quark condensate, and, therefore, is strongly suppressed. The polarization operator of the pentaquark current is calculated using the operator product expansion. The $\Theta^+$ mass found by the QCD sum rules method is in a reasonable agreement with experiment.
Received: 19.08.2004
Citation:
B. L. Ioffe, A. G. Oganesian, “Pentaquark decay is suppressed by chirality conservation”, Pis'ma v Zh. Èksper. Teoret. Fiz., 80:6 (2004), 439–441; JETP Letters, 80:6 (2004), 386–388
Linking options:
https://www.mathnet.ru/eng/jetpl2118 https://www.mathnet.ru/eng/jetpl/v80/i6/p439
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Abstract page: | 214 | Full-text PDF : | 51 | References: | 62 |
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