Pentaquark decay is suppressed by chirality conservation

Details Pentaquark decay is suppressed by chirality conservation Pentaquark decay is suppressed by chirality conservation

2004-08-12

arxiv.org/abs/hep-ph/0408152v4

JETP Lett.80:386-388,2004; Pisma Zh.Eksp.Teor.Fiz.80:439-441,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 fig, typos corrected

Scientific paper

10.1134/1.1830653

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 $\alpha^2_s < 0 | \bar{q} q | 0 >^2$, where $<0 | \bar{q} q | 0 >$, $q = u,d,s$ is quark condensate, and, therefore, is strongly suppressed. Also the polarization operator of the pentaquark current with isospin 1 is calculated using the operator product expansion and estimation for it mass is obtained .

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